IMS Laboratory of Plasma Technology
“No research without action, no action without research” - Kurt Lewin
Prof. Dr. Nguyen Thanh Tung
He graduated from Hanoi University of Science and Technology with a Degree of B.Eng in the field of Applied Physics. In December 2009, he got the Degree of M.Sc from the Department of Physics, Hanyang University (Seoul, Korea), and then obtained a Ph.D. degree from the Department of Physics and Astronomy, Katholieke Universiteit Leuven in 2014. Since August 2015, he has joined the Metamaterials Lab of Prof. Takuo Tanaka in RIKEN Wako, Japan as a Japan Society for Promotion of Science (JSPS) postdoctoral fellow.
He previously worked in optics, magnetism, and spectroscopic characterizations. My work focused on fundamentals and applications of artificially engineered materials, on one hand, from the top-down such as electromagnetic metamaterials, and on the other hand, from the bottom-up such as multi-element atomic clusters, including simulations and measurements of microwave, infrared, and optical structures, especially the physics of magnetic materials at the atomic level using the Stern-Gerlach magnetic deflection technique. Recently, his interest is investigating the use of thermal and cold plasma technology to produce nanomaterials and modify surfaces for real applications.
He is a Senior Researcher at the Institute of Materials Science (IMS). He serves as a Full Professor at the Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology (VAST).
Education
Ph.D., Physics, Department of Physics and Astronomy, KU Leuven, Leuven 3000, Belgium (2010-2014), supervised by Prof. Peter Lievens, Prof. Ewald Janssens, Prof. Margriet Van Bael
M.Sc., Physics, Department of Physics, Hanyang University, Seoul, Korea (2007-2009), supervised by Prof. YoungPak Lee
B.Eng., Physics, School of Engineering Physics, Hanoi University of Science and Technology, Hanoi, Vietnam (2001-2006), supervised by Prof. Tran Xuan Hoai
Academic Experience
JSPS postdoctoral fellow (09/2015--09/2016), Metamaterials Laboratory, RIKEN Wako-Saitama, Japan
Researcher (04/2014--09/2017), Institute of Materials Science (IMS), Vietnam Academy of Science and Technology, Vietnam
Lecturer (05/2015--present), Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Vietnam
Principal Researcher (10/2017--10/2024), Institute of Materials Science, Vietnam Academy of Science and Technology, Vietnam
Head of Laboratory of Plasma Technology (12/2018-present), Institute of Materials Science, Vietnam Academy of Science and Technology, Vietnam
Associate Professor (12/2020--11/2024), Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Vietnam
Senior Researcher (11/2024 --present), Institute of Materials Science, Vietnam Academy of Science and Technology, Vietnam
Full Professor (12/2024--present), Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology, Vietnam
Vice-Director (11/2019--present), Institute of Materials Science, Vietnam Academy of Science and Technology, Vietnam
Projects
[VAST excellent group: ......./25-26] [PI] [Fabrication and modification of advanced materials using thermal and cold plasma towards applications in environtment and energy] [$ 80k]
[FWO.103.2022.01] (2023-2026) [PI] Synergy between top-down and bottom-up fabrication in plasmonics by embedding nanoclusters in metamaterials, funded by FWO-NAFOSTED. [in collaboration with Belgian partners] [$ 70k]
[VAST key program: TĐHYD0.04/22-24] [PI] Investigation of advanced catalytic materials for water splitting and fuel cell [$ 330k]
[Infrastructure grant 19-21] [PI] Development of laboratory for plasma technology ($ 380k)
[Infrastructure grant 22-24] [Head of Management Board] Development of laboratory for hydrogen technology ($ 4.2M)
[VAST.03.03/21-22] (2021-2022) [PI] Investigation on geometrical, electronic structure, and hydrogen absorption of s-d hybridized subnanometer systems.
[QTBY.01.01/20-21] (2020-2021) [PI] The absorption of terahertz radiation by two-dimensional hybridized meta-surfaces for nano-plasmonic devices. [in collaboration with Belarusian partners]
[FWO.103.2017.01] (2018-2021) [PI] Exploring the physical principles of electromagnetic energy harvesting in GHz and THz metamaterials, funded by FWO-NAFOSTED. [in collaboration with Belgian partners] [$ 70k]
[KHCBVL.01/18-19] (2018-2020) [PI] Investigation on tunable electromagnetic properties of hybrid graphene-metamaterials, funded by Vietnam Academy of Science and Technology.
[CSTĐ.02.18] (2018-2019) [PI] Investigation of a microwave superlens for harvesting wireless energy, funded by National Key Lab for Electronic Materials and Devices.
[CSCL 05.17] (2017-2018) [PI] Investigation of transition metal-based clusters using the density-functional theory, funded by the National Key Lab for Electronic Materials and Devices.
[HTTĐ 03.16] (2016-2017) [PI] Flexible metamaterials fabricated by ink-jet printing, funded by the National Key Lab for Electronic Materials and Devices.
[JSPS P15059] (2015-2017) [PI] Planar active THz metamaterials using phase transition materials, funded by JSPS, hosted by RIKEN, Japan.
[NAFOSTED 103.02-2014.67] (2015-2017) [PI] Influence of size and composition on the stability, structure, and magnetic properties of transition metal clusters, funded by NAFOSTED.
[NAFOSTED 103.02-2015.84] (2016-2018) [Member] Fabrication and characterization of isotropic metamaterials perfect absorber operating at the X band. Ref: (8-12 GHz), funded by NAFOSTED.
[NAFOSTED 103.02-2013.54] (2014-2016) [Member] Influence of structural parameters on the loss and bandwidth of metamaterials, funded by NAFOSTED.
[FWO.2011.35] (2011-2013) [Member] Taming metamaterials, funded by FWO and NAFOSTED.
Scientific Expertise
Microwave and optical metamaterials for negative-refractive index, electromagnetically-induced transparency, and perfect absorbers.
Theoretical and numerical methods for metamaterials and photonics (Transmission line modeling, Transfer-matrix method, FDTD, FEM).
Infrared and optical metamaterials: fabrication (E-beam and UV maskless lithography) and characterization (AFM, SEM, FTIR, Optical spectroscopy).
Production and characterization (stability and magnetism) of gas-phase nanoclusters using the pulsed laser ablation technique and DFT simulations.
Stern-Gerlach magnetic deflection and photo-fragmentation technique.
Mass spectroscopy and laser spectroscopy.
Cold and thermal plasma technologies.
Professional Activities
Member of Standing Committee of Vietnam Materials Research Society
Member of Executive Committee of Vietnam Physical Society
Reviewer of more than 60 ISI journals, including many reputable ones like Scientific Reports (Nature Springer), Optics Express (OSA), Journal of Lightwave Technology (OSA), Journal of Optical Society of America B (OSA), Nanotechnology (IOP), Journal of Physics D: Applied Physics (IOP), Journal of Optics (IOP), Smart Materials and Structures (IOP), Journal of Physical Chemistry A/C (ACS), New Journal of Chemistry (RSC) Journal of Applied Physics (AIP), Physica E (Elsevier), Journal of Materials Science (Springer), Ceramics International (Elsevier), IEEE Transactions on Magnetic, Nanoscale Research Letters, Journal of Electromagnetic Waves and Applications, Optics Communications ...
Reviewer of the Vietnam National Foundation for Science and Technology Developments (NAFOSTED), VINFUTURE, VINIF.
Reviewer of the Indonesian Science Fund (DIPI).
Reviewer of the Russian Science Foundation (RSF) Expert Councils.
Member of the Editorial Board of Scientific Reports (SCIE).
Member of the Editorial Board of Frontiers in Physics: Computational Physics (SCIE).
Member of the Editorial Board of Frontiers in Chemistry: Physical Chemistry and Chemical Physics (SCIE).
Section Editor of Advances in Natural Sciences: Nanoscience and Nanotechnology (ESCI).
Active member of the Optical Society of America, American Physical Society, and European Physical Society.
Member of VAST Scientific Committees for Materials Science
Member of IMS Scientific committees
Regular member of IMS PhD admission committees, and project/proposal evaluation committees.
Member of Organizing Committees, 1st Metamaterial meeting 2014 in Ha Noi.
Member of Publication Committees, 7th International Workshop on Advanced Materials Science and Nanotechnology 2014 in Ha Long.
Member of Scientific Secretariats, 8th International Workshop on Advanced Materials Science and Nanotechnology 2016 in Ha Long.
Head of Scientific Secretariats, the 9th International Workshop on Advanced Materials Science and Nanotechnology (IWAMSN 2018) in Ninh Binh.
Co-chair of Local Organizing Committees, the 10th International Workshop on Advanced Materials Science and Nanotechnology (IWAMSN 2021) in Hanoi.
Co-chair of Local Organizing Committees, the 11th International Workshop on Advanced Materials Science and Nanotechnology (IWAMSN 2024) in Danang.
Publications (until May 2024)
[Book] Binary Nanoclusters: Simulation, Fabrication, and Fundamental Characteristics (in Vietnamese), Nguyen Thanh Tung and Nguyen Thi Mai, Publishing House for Science and Technology, Vietnam (pdf)
[Book chapter] Advances in Metamaterials in Conventional Low frequency Perfect Absorbers: A Brief Review, Bui Xuan Khuyen, Bui Son Tung, Nguyen Thanh Tung, Vu Dinh Lam, Liang Yao Chen, and YoungPak Lee in Metamaterials : Technology and Applications, edited by Pankaj K. Choudhury, CRC Press, 2022 (eBook ISBN: 9781003050162) (pdf).
2025
[123] Microwave-Assisted Synthesis of Copper Ferrite Nanocatalysts for Synergistic Plasma-Fenton Degradation of Rhodamine B, Minh Thu Nguyen, Minh Dang Nguyen, Tung Hoang Nguyen, Ming Gao, Neha Kaushik, Ovchinnikov Viktor Vasilevich, Adylina Anna Petrovna, Olefirenko Nikita Andreevich, Nagendra Kumar Kaushik, Tung Thanh Nguyen, and Linh Nhat Nguyen, Colloids and Surfaces A: Physicochemical and Engineering Aspects 705, 135681 (2025) (pdf)
[122] The Dimerization of the Aβ42 under the Influence of the Gold nanoparticle: a REMD study, Thai Quynh Mai, Nguyen Thanh Tung, Do Thi Mai Dung, and Son Tung Ngo, The Journal of Physical Chemistry B (accepted).
[121] Self-assembly of porphyrin nanofiber on the surface CuFe2O4 nanoparticles: A novel photoanode for enhanced photo-electrochemical water splitting, Chinh Van Tran, Trung-Dung Dang, Van Duy Lai, Giang Thi Nguyen, Bui Thi Hoa, Hoang Tung Nguyen, Hoai Phuong Nguyen Thi, Thanh Tung Nguyen, and Duong Duc La, Fuel 380, 133196 (2025) (pdf).
2024
[120] The Outlook of Flexible DBD-Plasma Devices: Applications in Food Science and Wound Care Solutions, T. M. Nguyen, N. Kaushik, T. T. Nguyen, E. H. Choi, L. N. Nguyen, N. K. Kaushik, Materials Today Electronics 7, 100087 (2024) (pdf)
[119] Pencil-on-paper flexible DBD plasma for surface disinfection, Neha Kaushik, Thuan Nguyen Dao, Minh Thu Nguyen, Shweta B. Borkar, Hoang Tung Nguyen, Le Thi Quynh Xuan, Tirtha Raj Acharya, Thanh Tung Nguyen, Eun Ha Choi, Nagendra Kumar Kaushik, and Linh Nhat Nguyen, Mater. Adv. 5, 5204-5212 (2024) (pdf)
[118] Dual-band infrared metamaterial perfect absorber for narrow-band thermal emitters, B. X. Khuyen, N. Van Ngoc, D. N. Dung, N. P. Hai, N. T. Tung, B. S. Tung, V. D. Lam, and Y. P. Lee, Journal of Physics D: Applied Physics 57, 285501 (2024) (pdf).
[117] MoSSe-graphene based sandwiched nanolayer hybrid as high-performance lithium sulfur-selenium (LiSSe) battery cathodes, H. T. Bui, N. T. Tung, N. H. Tung, J. Y. Kim, H. I. Chang, S. H. Han, S. A. Patil, H. Im, and Nabeen K Shrestha, Inorganic Chemistry Communications 167, 112759 (2024) (pdf).
[116] Facile synthesis of g-C3N4@porphyrin nanofiber composite via self-assembly as photoelectrode for efficient photoelectrochemical water splitting, Thanh Tung Nguyen, Giang Thi Nguyen, Trung Dung Dang, Bui Thi Hoa, Hoang Tung Nguyen, Hoai Phuong Nguyen Thi, Chinh Van Tran, Jae Yup Kim, X. Hoan Nguyen, D. Duc Nguyen, Duong Duc La, Process Safety and Environmental Protection 189, 219-227 (2024) (pdf).
[115] Unraveling Hydrogen Adsorption on Transition Metal-Doped [Mo3S13]2– Clusters: Insights from Density Functional Theory Calculations, Thu Thi Phung, Nguyen Thi Huyen, Nguyen Thi Giang, Nguyen Minh Thu, Nguyen Thanh Son, Nguyen Hoang Tung, Ngo Thi Lan, Son Tung Ngo, Nguyen Thi Mai, and Nguyen Thanh Tung, ACS Omega 9, 19732 (2024) (pdf)
[114] Tunable Mid-Infrared Multi-Resonant Graphene-Metal Hybrid Metasurfaces, Fei Han, The Linh Pham, Kacper Pilarczyk, Nguyen Thanh Tung, Dinh Hai Le, Guy A. E. Vandenbosch, Joris Van de Vondel, Niels Verellen, Xuezhi Zheng, Ewald Janssens, Advanced Optical Materials 12, 2303085, 2024, (pdf)
2023
[113] Facile synthesis and effect of thermal treatment on MoO3-x@MoS2 (x = 0, 1) bilayer nanostructure: Toward photoelectrochemical applications, Tien-Thanh Nguyen, Tien Dai Nguyen, Thi Bich Vu, Luong Xuan Dien, Hoang V. Le, Hung Manh Do, and Thanh Tung Nguyen, Physica Scripta 98, 125961 (2023) (pdf).
[112] Exploring Hydrogen Adsorption on Nanocluster Systems: Insights from DFT Calculations of Au9M2+ (M = Sc-Ni), Ngo Thi Lan, Nguyen Thi Mai, Duong Duc La, Son Tung Ngo, Nguyen Minh Tam, Nguyen Van Dang, and Nguyen Thanh Tung, Chemical Physics Letters 831, 140838 (2023) (pdf, featured in the volume front cover).
[111] Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization, Hoa Thi Bui, Nguyen Duc Lam, Do Chi Linh, Nguyen Thi Mai, HyungIl Chang, Sung-Hwan Han, Vu Thi Kim Oanh, Anh Tuan Pham, Supriya A. Patil, Nguyen Thanh Tung, and Nabeen K. Shrestha, Nanomaterials 13, 2139 (2023) (pdf).
[110] Dual-Band Metamaterial-Based EBG Antenna for Wearable Wireless Devices, Trong Hieu Dam, Minh Thuy Le, Quoc Cuong Nguyen, and Thanh Tung Nguyen, International Journal of RF and Microwave Computer-Aided Engineering 2023, 2232674 (2023) (pdf).
[109] Robust Reversion of Dual-band Polarization Conversion and Absorption Based on Flexible Metamaterial, Le Van Long, Dinh Ngoc Dung, Pham Thanh Son, Nguyen Thanh Tung, Vu Thi Hong Hanh, Duong Thi Ha, Do Thuy Chi, Bui Son Tung, Bui Xuan Khuyen, and Vu Dinh Lam, Journal of the Physical Society of Japan 92, 024821 (2023) (pdf).
[108] Facile preparation of porphyrin@g-C3N4/Ag nanocomposite for improved photocatalytic degradation of organic dyes in aqueous solution, Thanh Tung Nguyen, Hoa Thi Bui, Giang Thi Nguyen, Tung Nguyen Hoang, Chinh Van Tran, Phuong Hien Ho, Phuong T. Hoai Nguyen, J. Yup Kim, S. Woong Chang, W. Jin Chung, D. Duc Nguyen, D. Duc La, Environmental Research 231, 115984 (2023) (pdf).
[107] Effects of hyperparameters and machine learning approaches in forecasting absorption behavior of GHz disk-shape metamaterials, Nguyen Thanh Son, Nguyen Hoang Tung, and Nguyen Thanh Tung, Modern Physics Letters B 37, 2350103 (2023) (pdf).
[106] Controlling THz Absorption Properties of Metamaterials Based on Graphene, Tran Van Huynh, Vu Dinh Lam, Bui Xuan Khuyen, Bui Son Tung, Nguyen Thanh Tung, Journal of Electronic Materials 52, 5719 (2023) (pdf).
[105] Upgrading nirmatrelvir to inhibit SARS-CoV-2 Mpro via DeepFrag and free energy calculations, Nguyen Minh Tam, Trung Hai Nguyen, Minh Quan Pham, Nam Dao Hong, Nguyen Thanh Tung, Van V. Vu, Duong Tuan Quang, Son Tung Ngo, Journal of Molecular Graphics and Modelling 124, 108535 (2023) (pdf).
2022
[104] Rotary bi-layer ring-shaped metamaterials for reconfiguration absorbers, Le Van Long, Nguyen Hoang Tung, Trinh Thi Giang, Pham Thanh Son, Nguyen Thanh Tung, Bui Son Tung, Bui Xuan Khuyen, and Vu Dinh Lam, Applied Optics 61, 9078 (2022) (pdf).
[103] Assembled porphyrin nanofiber on the surface of g-C3N4 nanomaterials for enhanced photocatalytic degradation of organic dyes, Thi Lai Hoan, Giang Thi Nguyen, Nga Thuy Tran; Thanh Tung Nguyen, Duy Khiem Nguyen, Chinh Van Tran, W. Jin Chung; S. Woong Chang, Duc Duong La, Dinh Duc Nguyen, Catalysts 12, 1630 (2022) (pdf).
[102] Characterizing the ligand-binding affinity toward SARS-CoV-2 Mpro via physics- and knowledge-based approaches, S. T. Ngo, T. H. Nguyen, N. T. Tung, V. V. Vu, M. Q. Pham, and B. K. Mai, Physical Chemistry Chemical Physics 24, 29266 (2022) (pdf).
[101] Effects of Cold Plasma Treatment on Physical Modification and Endogenous Hormone Regulation in Enhancing Seed Germination and Radicle Growth of Mung Bean, L. T. Q. Xuan, N. N. Linh, N. T. Tung, E. H. Choi, N. Q. Liem, N. K. Kaushik, D. N. Thuan, Applied Sciences 12, 10308 (2022) (pdf).
[100] In-situ formation and integration of graphene into MoS2 interlayer spacing: expansion of interlayer spacing for superior hydrogen evolution reaction in acidic and alkaline electrolyte, H. T. Bui, D. C. Linh, L. D. Nguyen, H. I. Chang, S. Patil, K. X. Bui, T. S. Bui, N. K. Shrestha, A. T. N. Nguyen, N. T. Tung, S. H. Han, S. T. Pham, Journal of Materials Science 57, 18993 (2022) (pdf).
[099] A DFT study of hydrogen adsorption on small AgnCr clusters (n = 1-12), Ngo Thi Lan, Nguyen Thi Mai, Phung Thi Hong Van, Duong Duc La, Ngo Tuan Cuong, Ngo Son Tung, Nguyen Minh Tam, Nguyen Van Dang, Nguyen Thanh Tung, ACS Omega 7, 37379 (2022) (pdf, featured in the issue front cover)
[098] Dioctyl phthalate-modified graphene nanoplatelets: an effective additive for enhanced abrasion resistance properties of natural rubber, Linh Duy Pham, Nguyen Chuong Bui, Liem Thanh Nguyen, Tung Huy Nguyen, Tung Thanh Nguyen, and Duong Duc La, Polymers 14, 2541 (2022) (pdf).
[097] Systematic synthesis of different-sized AgInS2/GaSx nanocrystals for emitting the strong and narrow excitonic luminescence, Tran Thi Thu Huong, Nguyen Thu Loan, Ung Thi Dieu Thuy, Nguyen Thanh Tung, HyukSu Han, Nguyen Quang Liem, Nanotechnology 33, 355704 (2022) (pdf).
[096] Edge magnetization and thermally induced spin current in nanostructured graphene, Thu Thi Phung, Nguyen Thi Mai, Pham Thi Lien, Ngo Thi Lan, and Nguyen Thanh Tung Journal of Physics: Condensed matters 34, 315801 (2022) (pdf).
[095] A computationally affordable approach for accurate prediction of the binding affinity of JAK2 inhibitors, Nguyen Thi Mai, Ngo Thi Lan, Thien Y. Vu, Nguyen Thanh Tung, and Huong Thi Thu Phung, Journal of Molecular Modelling 28, 163 (2022) (pdf)
[094] The first-row transition metal doped germanium clusters Ge16M: Some remarkable superhalogens, Tho Huu Nguyen, Ngo Tuan Cuong, Ngo Thi Lan, Nguyen Thanh Tung, Minh Tho Nguyen, and Nguyen Minh Tam, RSC Advances 12, 13487 (2022) (pdf).
[093] DFT investigation of Au9M2+nanoclusters (M = Sc-Ni): The magnetic superatomic behavior of Au9Cr2+, Ngo Thi Lan, Nguyen Thi Mai, Duong Duc La, Nguyen Minh Tam, Son Tung Ngo, Ngo Tuan Cuong, Nguyen Van Dang, Thu Thi Phung, Nguyen Thanh Tung, Chem. Phys. Lett. 793, 139451 (2022) (pdf).
[092] Dual-band ambient energy harvesting system based on metamaterials for self-powered indoor wireless sensor nodes, Minh Thuy Le, Duc Ngo Van, Nguyen Thanh Tung, Quoc Cuong Nguyen, International Journal of Microwave and Wireless Technologies 14, 1270 (2022) (pdf).
[091] Improving ligand-ranking of AutoDock Vina by changing the empirical parameters, T. Ngoc Han Pham, Trung Hai Nguyen, Nguyen Minh Tam, Thien Y. Vu, Nhat Truong Pham, Nguyen Truong Huy, Binh Khanh Mai, Nguyen Thanh Tung, Minh Quan Pham, Van V. Vu, and Son Tung Ngo, Journal of Computational Chemistry 43, 160 (2022) (pdf)
[090] Insights into the Binding and Covalent Inhibition Mechanism of PF-07321332 to SARS-CoV-2 Mpro, Son Tung Ngo, Trung Hai Nguyen, Nguyen Thanh Tung, and Binh Khanh Mai, RSC Advances 12, 3729 (2022) (pdf)
[089] Unbinding Ligands from SARS-CoV-2 Mpro via Umbrella Sampling Simulations, N. M. Tam, T. H. Nguyen, V. T. Ngan, N. T. Tung, and S. T. Ngo, Royal Society Open Science 9, 211480 (2022) (pdf)
2021
[088] The binary aluminum – scandium clusters AlxScy with x + y = 13: When the icosahedron is retained?, Ngo Tuan Cuong, Nguyen Thi Mai, Nguyen Thanh Tung, Ngo Thi Lan, Long Van Duong, Minh Tho Nguyen, Nguyen Minh Tam , RSC Advances 11, 40072 (2021) (pdf).
[087] Dual-band, Polarization-insensitive, Ultrathin and Flexible Metamaterial Absorber Based on High-order Magnetic Resonance, Duong Thi Ha, Bui Son Tung, Bui Xuan Khuyen, Thanh Son Pham, Nguyen Thanh Tung, Nguyen Hoang Tung, Nguyen Thi Hoa, Vu Dinh Lam, Haiyu Zheng, Liang Yao Chen, YoungPak Lee, Photonics 8, 574 (2021) (pdf).
[086] Heat flow dynamics in planar metamaterials excited by far-infrared picosecond laser pulses, M. Bejide, A. Vantomme, N. T. Tung, and E. Janssens, Journal of Physics D: Applied Physics 55, 025105 (2022) (pdf).
[084] Active control of the hybridization effect of near-field coupled resonators in metamaterial for a tunable negative refractive index at terahertz frequencies, Nguyen Thi Hien, Nguyen Xuan Ca, Bui Xuan Khuyen, Tran Van Huynh, Nguyen Sy Khiem, Nguyen Thanh Tung, Vu Dinh Lam, Bui Son Tung, Journal of Physics and Chemistry of Solids 156, 110173 (2021) (pdf).
[083] Flexible Broadband Metamaterial Perfect Absorber Based on Graphene-Conductive Inks, Le Van Long, Nguyen Sy Khiem, Bui Son Tung, Nguyen Thanh Tung, Trinh Thi Giang, Pham Thanh Son, Bui Xuan Khuyen, Vu Dinh Lam, Liangyao Chen, Haiyu Zheng and Youngpak Lee, Photonics 8, 440 (2021) (pdf).
[082] Thermodynamics and Kinetics in Antibody Resistance of the 501Y.V2 SARS-CoV-2 Variant, S. T. Ngo, T. H. Nguyen, D.-H. Pham, N. T. Tung, and P. C. Nam, RSC Advances 11, 33438 (2021) (pdf).
[081] Self-assembly of porphyrin nanofibers on the ZnO nanoparticles for the enhanced photocatalytic performance for organic dye degradation, Hoang Tung Vo , Tuan Anh Nguyen, Xuan Sang Nguyen , Chinh Van Tran , Thanh Tung Nguyen , Tien Dung Pham , Dinh Duc Nguyen , Duong Duc La, ACS Omega 6, 23203 (2021) (pdf).
[080] Activated carbon with ultrahigh surface area derived from sawdust biowaste for the removal of rhodamine B in water, Van Hoang Nguyen, Dung T. Nguyen, T. Tung Nguyen, H. Phuong T. Nguyen, H. Binh Khuat, T. Hung Nguyen, V. Khanh Tran, S. W. Chang, P. Nguyen-Tri, D. Duc Nguyen*, and D. Duc La*, Environmental Technology & Innovation 24, 101811 (2021) (pdf).
[079] Dual-polarized wide-angle energy harvester for self-powered IoT devices, Minh Dinh, Nam Ha-Van, Nguyen Thanh Tung, and Minh Thuy Le*, IEEE Access 9, 103376 (2021) (pdf).
[078] Facile synthesis of in situ CNT/WO3∙H2O nanoplate composites for adsorption and photocatalytic applications under visible light irradiation, Hong Son Nguyen, Anh Luu, Hung Thang Bui, Nguyen Thanh Tung, Huu Lam Nguyen, and Cong Tu Nguyen*, Semiconductor Science and Technology 36, 095010 (2021) (pdf).
[077] A systematic investigation on the structure, stability, and spin magnetic moment of CrMn clusters (M = Cu, Ag, Au and n = 2-20) by DFT calculations, N. T. Mai, N. T. Lan, T. T. Phung, N. M. Tam, N. T. Cuong, S. T. Ngo, N. V. Dang, and N. T. Tung*, ACS Omega 6, 20341 (2021) (pdf). (highlighted in the front cover)
[076] THz cut-wire-pair metamaterial absorber, D. Q. Minh, S. T. Ngo, M. T. Le*, T. V. Huynh, and N. T. Tung*, Journal of Applied Physics 130, 013102 (2021) (pdf).
[075] Functionalization-mediated preparation via acid precipitation method and photocatalytic activity of in-situ Ag2WO4@WO3.H2O nanoplates, N. H. Son, N. G. Nam, N. T. Anh, T. N. Bach, L. L. Anh, N. T. Tung, N. N. Trung, N. D. Chien, N. H. Lam, N. C. Tu*, ESC Journal of Solid State Science and Technology 10, 054009 (2021) (pdf).
[074] Harvesting electromagnetic energy with scalable polarization-insensitive metamaterial absorber, D. Q. Minh, T. L. Hoang, H. T. Vu, N. T. Tung*, and M. T. Le*, Journal of Physics D: Applied Physics 54, 345502 (2021) (pdf).
[073] Graphene-integrated hybridized metamaterials for wide-angle tunable infrared absorber, D. Q. Minh, T. V. Huynh, B. X. Khuyen, B. S. Tung, S. T. Ngo, V. D. Lam, M. T. Le*, and N. T. Tung*, Photonics and Nanostructures: Fundamentals and Applications 45, 100924 (2021) (pdf).
[072] Binding of Inhibitors to the Monomeric and Dimeric SARS-CoV-2 Mpro, N. M. Tam, P. C. Nam, D. Quang, N. T. Tung, V. Vu, S. T. Ngo*, RSC Advances 11, 2926 (2021) (pdf).
[071] Origami-based stretchable multifunctional metasurfaces: Reflector and broadband absorber, T. L. Pham, B. X. Khuyen, B. S. Tung, L. D. Hai, V. D. Lam, and N. T. Tung*, Journal of Physics D: Applied Physics 54, 165111 (2021) (pdf).
[070] Unifying approach to multilayer metamaterials for wideband absorbers, D. Q. Minh, M. T. Le, S. T. Ngo, and N. T. Tung*, Optics Communications 485, 126725 (2021) (pdf).
2020
[069] Transient transmission of THz metamaterial antennas by impact ionization on the silicon substrate, M. Bejide, Y. Li, N. Stavrias, B. Redlich, T. Tanaka, V. D. Lam, N. T. Tung*, and E. Janssens, Optics Express 29, 170 (2020) (pdf).
[068] Assessing Potential Inhibitors for SARS-CoV-2 Main Protease from Available Drugs using Free Energy Perturbation Simulations, S. T. Ngo, M. H. Nguyen, L. T. T. Huong, M. Q. Pham, V. K. Truong, N. T. Tung, V. Vu, RSC Advances 10, 40284 (2020) (pdf).
[067] Rapid Prediction of Possible Inhibitors for SARS-CoV-2 Main Protease using Docking and FPL Simulations, Minh Quan Pham, Khanh B. Vu, T. Ngoc Han Pham, Le Thi Thuy Huong, Linh Hoang Tran, Nguyen Thanh Tung, Van V. Vu, Trung Hai Nguyen, and Son Tung Ngo, RSC Advances 10, 31991 (2020) (pdf).
[066] Facile fabrication of graphene@Fe-Ti binary oxide nanocomposite from ilmenite ore: An effective photocatalyst for dye degradation under visible light irradiation, T. N. Tuan, T. V. Chinh, H. P. Nguyen, H. D. Ninh, N. T. Tung, D. T. Dang, S. W. Chang, D. D. Nguyen, L. D. Duong*, Journal of Water Process Engineering 37, 101474 (2020) (pdf).
[065] Photofragmentation patterns of cobalt oxide cations ConOm+ (n=5-9, m=4-13): from oxygen-deficient to oxygen-rich species, N. T. Mai, S. T. Ngo, P. Lievens, and E. Janssens, and N. T. Tung, Journal of Physical Chemistry A 124, 7333 (2020) (pdf) (highlighted in the front cover).
[064] Estimation of the ligand-binding free energy of checkpoint kinase 1 via non-equilibrium MD simulations, Nguyen Thi Mai, Lan Thi Ngo, Y Vu, Phuong Thi Mai Duong, Nguyen Thanh Tung*, Huong Thi Thu Phung*, Journal of Molecular Graphics and Modelling 100, 107648 (2020) (pdf).
[063] Scalable fabrication of modified graphene nanoplatelets as an effective additive for engine lubricant oil, D. Duc La*, T. Ngoc Truong, Thuan Q. Pham, T. Hoang Vo, Nam T. Tran, T. Anh Nguyen, Ashok Kumar Nadda, Thanh Tung Nguyen, S. Woong Chan, W.J. Chung, D. Duc Nguyen*, Nanomaterials 10, 877 (2020) (pdf).
[062] Effective estimation for inhibitor affinity of HIV-1 protease via a modified LIE approach, Son Tung Ngo, Nam Dao Hong , Le Huu Quynh Anh, Dinh Minh Hiep, and Nguyen Thanh Tung, RSC Advances 10, 7732 (2020) (pdf).
[061] Polarization-insensitive electromagnetically-induced transparency in planar metamaterial based on coupling of ring and zigzag spiral resonator, Bui Son Tung, Bui Xuan Khuyen, Pham The Linh, Nguyen Thanh Tung, Do Hung Manh and Vu Dinh Lam*, Modern Physics Letters B 34, 2050093 (2020) (pdf).
[060] Enhanced Optical and Photocatalytic Properties of Au/Ag Nanoparticle-decorated ZnO Films , V. D. Thinh, V. D. Lam, T. N. Bach, N. D. Van, D. H. Manh, D. H. Tung, N. T. H. Lien, U. T. D. Thuy, T. X. Anh, N. T. Tung and N. T. H. Le*, Journal of Electronic Materials 49, 2625 (2020) (pdf).
[059] Fine tuning of the copper active site in polysaccharide monooxygenases, Son Tung Ngo, Han N. Phan, Chinh N. Le, Nhung C. T. Ngo, Khanh Bao Vu, Nguyen Thanh Tung, Cuong X. Luu, Van V. Vu, Journal of Physical Chemistry B 124, 1859 (2020) (pdf).
[058] Realization for dual-band high-order perfect absorption based on metamaterial, X. K. Bui, S. T. Bui, N. T. Tung, N. T. Hien, Y. J. Kim, L. Y. Chen, Y. P. Lee, T. L. Pham, V. D. Lam, Journal of Physics D: Applied Physics 53, 105502 (2020) (pdf).
[057] Constraint effect caused by graphene on in-situ grown Gr@WO3 nanobrick hybrid materials, P. T Phong, L. T. Lan-Anh, N. X. Sang, N. T. Tung, N. H. Lam, N. D. Chien, N. C. Tu, Ceramics International 46, 8711 (2020) (pdf).
[056] Oversample free energy pertubation simulation in determination of the ligand-binding free energy, S. T. Ngo*, N. T. Tung, P. C. Nam, K. B. Vu, and V. V. Vu, Journal of Computational Chemistry 41, 611 (2020) (pdf) (selected for front cover page).
2019
[055] Absorption behavior of graphene nanoplates toward oils and organic solvents in contaminated water, T. Anh Nguyen, N. T. Tung, H. Duc Ninh, Tham T. Nguyen, D. Anh Nguyen, T. Dung Dang, Duong D. La*, S. Woong Chang, D. Duc Nguyen, Sustainability 11, 7228 (2019) (pdf).
[054] Prediction of AChE-ligand Affinity using the Umbrella Sampling Simulation, N. T. Lan, K. B. Vu, M. K. D. Ngoc, P. T. Tran, D. M. Hiep, N. T. Tung, S. T. Ngo*, Journal of Molecular Graphics and Modelling 93, 107441 (2019) (pdf).
[053] Electrically tunable graphene-based metamaterials: A brief review, T. V. Huynh, B. X. Khuyen, B. S. Tung, N. T. Tung*, and V. D. Lam*, Modern Physics Letters B 33, 1950404 (2019) (pdf).
[052] Large-area cost-effective lithography-free infrared metasurface absorbers for molecular detection, U. T. D. Thuy*, N. T. Thuy, N. T. Tung*, E. Janssens, and N. Q. Liem, APL Materials 7, 071102 (2019) (pdf).
[051] In vitro and in silico determinations of glutaminyl cyclase inhibitors, P.-T. Tran, V.-H. Hoang, J. Lee, T. T. T. Hien, N. T. Tung, and S. T. Ngo*, RSC Advances 9, 29619 (2019) (pdf).
[050] C-terminal Plays as the Possible Nucleation of the Self-Aggregation of S-shape Aβ11-42 Tetramer in Solution: Intensive MD Study, N. T. Tung, P. Derreumaux, V. Vu, P. C. Nam, and S. T. Ngo*, ACS Omega 4, 11066 (2019) (pdf).
[049] Controlling the absorption strength in bidirectional terahertz metamaterial absorbers with patterned graphene, T. V. Huynh, B. X. Khuyen, B. S. Tung, S. T. Ngo, V. D. Lam*, and N. T. Tung*, Computational Materials Science 166, 276 (2019) (pdf).
[048] Structure and electrochemical property of amorphous molybdenum selenide H2-evolving catalysts prepared by a solvothermal synthesis, Chuc T. Nguyen, Tuan M. Duong, Mai Nguyen, Quyen T. Nguyen, Anh D. Nguyen, Ung T. D. Thuy, Quang D. Truong, Tung T. Nguyen, Quang L. Nguyen*, and Phong D. Tran*, International Journal of Hydrogen Energy 44, 13273 (2019) (pdf).
2018
[047] Ultimate manipulation of magnetic moments in the golden tetrahedron Au20 with a substitutional 3d impurity, N. M. Tam, N. T. Mai, H. T. Pham, H. T. Pham, and N. T. Tung*, Journal of Physical Chemistry C 122, 16256 (2018) (pdf).
[046] The influences of E22Q mutant on solvated 3Aβ11-40 peptide: A REMD study, S. T. Ngo*, H. M. Hung, D. N. Hong, and N. T. Tung, Journal of Molecular Graphics and Modelling 83C, 122 (2018) (pdf).
[045] A novel wideband circularly polarized antenna for RF energy harvesting in wireless sensor nodes, N. H. Nguyen, T. D. Bui, A. D. Le, A. D. Pham, N. T. Tung, Q. C. Nguyen, and M. T. Le*, Int. J. Anten. Propag. 2018, 1692018 (2018) (pdf).
[044] Characterizations of an infrared polarization-insensitive metamaterial perfect absorber and its potential in sensing applications, N. T. Tung* and T. Tanaka, Photonics and Nanostructures: Fundamentals and Applications 28, 100 (2018) (pdf).
2017
[043] Au19M (M=Cr, Mn, and Fe) as magnetic copies of the golden pyramid, N. M. Tam, H. T. Pham, N. T. Cuong, and N. T. Tung*, Scientific Reports 7, 16086 (2017) (pdf).
[042] A DFT investigation on geometry and chemical bonding of isoelectronic Si8N6V-, Si8N6Cr, and Si8N6Mn+ clusters, N. M. Tam,* H. T. Pham, N. T. Cuong, and N. T. Tung*, Chem. Phys. Lett. 685, 410 (2017) (pdf).
[041] A theoretical investigation on SinMn2+ clusters (n=1-10): Geometry, stability, and magnetic properties, N. T. Mai, N. T. Tung,* P. T. Thuy, N. T. M. Hue, and N. T. Cuong*, Comput. Theor. Chem. 1117, 124 (2017). (pdf)
[040] Production of photonic nanojets by using pupil-masked 3D dielectric cuboid, L. Yue*, B. Yan, J. N. Monks, Z. Wang, N. T. Tung, V. D. Lam, O. Minin, and I. Minin, J. Phys. D: Appl. Phys. 50, 175102 (2017) (pdf).
[039] Dynamics of polystyrene beads linking to DNA molecules under single optical tweezers: A numerical study using full normalized Langevin equation, T. D. Trung, B. X. Kien, N. T. Tung, and H. Q. Quy*, J. Nonlinear Optic. Phys. Mat. 25, 1650054 (2017) (pdf).
[038] Hybrid semiconductor-dielectric metamaterial modulation for switchable bidirectional THz absorbers, L. N. Le, N. M. Thang, L. M. Thuy, and N. T. Tung*, Optics Communications 383, 244 (2017) (pdf).
2016
[037] A systematical investigation on CrCun clusters with n=9-12: Noble gas and tunable magnetic property, H. T. Pham, N. T. Cuong, N. M. Tam, and N. T. Tung*, Journal of Physical Chemistry A 120, 7335 (2016) (pdf).
[036] Comment on "Analysis of single-layer metamaterial absorbers with reflection theory", N. T. Tung*, Journal of Applied Physics 119, 096101 (2016) (pdf).
[035] Symmetry-breaking metamaterials enabling broadband negative permeability, P. T. Trang, B. H. Nguyen, D. H. Tiep, L. M. Thuy, V. D. Lam, and N. T. Tung*, Journal of Electronic Materials 45, 2547 (2016) (pdf).
2015
[034] Structure, magnetism, and dissociation energy of small bimetallic Co-Cr oxide cluster cations: A density-functional-theory study, H. T. Pham, N. T. Cuong, N. M. Tam, V. D. Lam, and N. T. Tung*, Chemical Physics Letters 643, 77 (2015) (pdf).
[33] Taming electromagnetic metamaterials for isotropic perfect absorbers, D. T. Anh, D. T. Viet, P. T. Trang, N. M. Thang, H. Q. Quy, N. V. Hieu, V. D. Lam, and N. T. Tung*, AIP Advances 5, 077119 (2015) (pdf).
[032] Characterization of a thermo-tunable broadband fishnet metamaterial at TH frequencies, N. T. Hien, L. N. Le, P. T. Trang, B. S. Tung, N. D. Viet, P. T. Duyen, N. M. Thang, D. T. Viet, Y. P. Lee, V. D. Lam, and N. T. Tung*, Computational Material Science 103, 189 (2015) (pdf).
[031] Isotropic metamaterial perfect absorbers, D. T. Viet, N. V. Hieu, V. D. Lam, and N. T. Tung*, Applied Physics Express 8, 032001 (2015) (pdf).
2014
[030] Broadband negative permeability using hybridized metamaterials: Characterization, multiple hybridization, and terahertz response, N. T. Tung,* B. S. Tung, P. Lievens, E. Janssens, and V. D. Lam*, Journal of Applied Physics 116, 083104 (2014) (pdf).
[029] Influence of Cr doping on the stability and structure of small cobalt oxide clusters, N. T. Tung, N. M. Tam, M. T. Nguyen, P. Lievens, and E. Janssens*, Journal of Chemical Physics 141, 044311 (2014) (pdf).
[028] Improved field post-processing for a Stern-Gerlach magnetic deflection magnet, H. De Gersem*, B. Masschaele, T. Roggen, E. Janssens, N.T. Tung, International Journal of Numerical Modelling 201, 472 (2014) (pdf).
[027] Dopant dependent stability of transition metal doped cobalt cluster cations, N. T. Tung*, E. Janssens, and P. Lievens, Applied Physics B 114, 497 (2014) (pdf).
[026] Polarization dependence of the metamagnetic resonance of cut-wire-pair structure by using plasmon hybridization, N. V. Dung, Y. J. Yoo, Y. P. Lee,* N. T. Tung, B. S. Tung, and V. D. Lam, Journal of Korean Physical Society 65, 70 (2014) (pdf).
2013
[025] Thermally tunable magnetic metamaterial at THz frequencies, B. S. Tung, N. V. Dung, B. X. Khuyen, N. T. Tung*, P. Lievens, Y. P. Lee, and V. D. Lam*, Journal of Optics 15, 075101 (2013) (pdf).
[024] Photofragmentation of mass-selected vanadium doped cobalt cluster cations, N. T. Tung, E. Janssens*, B. Soumen, and P. Lievens, European Physical Journal D 67, 41 (2013) (pdf).
[023] Mass-selected photofragmentation studies of AlPbn+ clusters: Evidence for the extraordinary stability of AlPb10+ and AlPb12+, B. Soumen, N. T. Tung, J. DeHaeck, K. Hansen, P. Lievens, and E. Janssens*, Physical Review B 87, 054103 (2013) (pdf).
2012
[022] Broadband negative permeability by hybridized cut-wire pair metamaterials, N. T. Tung, D. T. Viet, B. S. Tung, N. V. Hieu, P. Lievens, and V. D. Lam*, Applied Physics Express 5, 112001 (2012) (pdf).
[021] Design of a strong gradient magnet for the deflection of nanoclusters, B. Masschaele*, T. Roggen, H. De Gersem, E. Jannsens, and T. T. Nguyen, IEEE Transactions on Applied Superconductivity 22, 3700604 (2012) (pdf).
[020] Multiplasmon resonances supporting the negative refractive index in "single atom" metamaterials, D. T. Viet, N. T. Tung, N. T. Hien, Y. P. Lee, B. S. Tung, and V. D. Lam*, Journal of Nonlinear Optical Physics & Materials 21, 1250019 (2012) (pdf).
2011
[019] Characterization and electromagnetic response of a phi-shaped metamaterial, N. T. Tung*, J. W. Park, V. T. T. Thuy, P. Lievens, Y. P. Lee, and V. D. Lam*, European Physical Journal B 81, 263 (2011) (pdf).
[018] Comment on Antisymmetric resonant mode and negative refraction in double-ring resonators under normal-to-plane incidence, N. T. Tung*, Physical Review E 83, 038601 (2011) (pdf).
[017] Strong tie between cut-wire pair and continuous wires in combined structure, J. W. Park, N. T. Tung, V. T. Thuy, V. D. Lam, and Y. P. Lee*, Optics Communications 284, 919 (2011) (pdf).
[016] In-plane interactions in supercells of cut-wire pairs, V. T. T. Thuy, N. T. Tung, V. D. Lam, J. W. Park, S. J. Lee, J. Y. Rhee, and Y. P. Lee*, Journal of Korean Physical Society 58, 87 (2011) (pdf).
2010
[015] Quasi-dark mode in a metamaterial for analogous electromagnetically-induced transparency, V. T. T. Thuy, N. T. Tung, J. W. Park, Y. H. Lu, J. Y. Rhee, and Y. P. Lee*, Journal of Optics 12, 115102 (2010) (pdf).
[014] Triple negative-permeability in hybridized cut-wire-pair metamaterials, V. T. T. Thuy, D. T. Viet, N. V. Hieu, V. D. Lam*, Y. P. Lee, and N. T. Tung*, Optics Communications 283, 4303 (2010) (pdf).
[013] Comprehensive effective-medium analysis for the transmission properties of combined metamaterials, N. T. Tung, T. X. Hoai, V. D. Lam, and Y. P. Lee*, Computational Material Science 49, S284 (2010) (pdf).
[012] Perfect impedance-matched left-handed behavior in combined metamaterial, N. T. Tung, T. X. Hoai, V. D. Lam, J. W. Park, V. T. Thuy, and Y. P. Lee*, European Physical Journal B 74, 47 (2010) (pdf).
[011] Left-handed transmission in a simple cut-wire pair structure, N. T. Tung, V. T. T. Thuy, J. W. Park, J. Y. Rhee, and Y. P. Lee*, Journal of Applied Physics 107, 023530 (2010) (pdf).
[010] Hybridized plasmon in asymmetric cut-wire pair metamaterials, N. T. Tung, J. Y. Rhee, J. W. Park, and Y. P. Lee*, Journal of the Korean Physical Society 57, 1733 (2010) (pdf).
2009
[008] Transmission properties of electromagnetic metamaterials: From split-ring resonator to fishnet structure, N. T. Tung, Y. P. Lee, and V. D. Lam*, Optical Review 16, 578 (2009) (pdf).
[007] Effects of the electric component on combined metamaterial structure, N. T. Tung, V. D. Lam, M. H. Cho, J. W. Park, S. J. Lee, W. H. Jang, and Y. P. Lee*, IEEE Transaction on Magnetics 45, 4310 (2009) (pdf).
[006] Influence of the dielectric-spacer thickness on the left-handed behavior of fishnet metamaterial structure, N. T. Tung, V. D. Lam, M. H. Cho, J. W. Park, W. H. Jang, and Y. P. Lee*, Photonics and Nanostructures: Fundamentals and Applications 7, 206 (2009) (pdf).
[005] Single- and double-negative refractive indices of combined metamaterial structure, N. T. Tung, V. D. Lam, J. W. Park, M. H. Cho, Y. P. Lee, J. Y. Rhee, and W. H. Jang, Journal of Applied Physics 106, 053109 (2009) (pdf).
[004] Influence of the lattice parameters on the resonance-frequency bands of a cut-wire-pair medium, V. D. Lam, N. T. Tung, M. H. Cho, J. W. Park, J. Y. Rhee, and Y. P. Lee, Journal of Applied Physics 105, 113102 (2009) (pdf).
[003] Effect of the dielectric layer thickness on the electromagnetic response of cut-wire pair and combined structures, V. D. Lam, N. T. Tung, M. H. Cho, J. W. Park, W. H. Jang, and Y. P. Lee, Journal of Physics D: Applied Physics 42, 115404 (2009) (pdf).
[002] Influence of the lattice constant on the electromagnetic behavior of cut-wire pair and combined structures, V. D. Lam, N. T. Tung, J. W. Park, S. J. Lee, and Y. P. Lee, Journal of the Korean Physical Society 55, 1250 (2009) (pdf).
2008
[001] Dependence of the distance between cut-wire-pair layers on resonance frequencies, V. D. Lam, J. B. Kim, N. T. Tung, S. J. Lee, Y. P. Lee, and J. Y. Rhee, Optics Express 16, 5934 (2008) (pdf).
Teaching Experience
2-SCH course "Computations in Materials Science", ref. HVVĐ 2-601, and 2-SCH course "Nanotechnology", ref. HVVĐ 1-602, for PhD students at Graduate University of Science and Technology, Vietnam Academy of Science and Technology.
Main promoter of (currently) 04 PhD students at GUST and joint promoter of 02 PhD students in KU Leuven, and many master/bachelor students.
Honors & Awards
Nippon Glass Foundation Research Grant Award 2020
Selected Vietnamese best young scientists in 2015.
JSPS Postdoctoral fellowship at RIKEN, Japan.
BOF doctoral fellowship at KU Leuven, Belgium.
Visiting scholar at University of Minnesota under US-VN Cooperative Research Program sponsored by NSF OISE-0435632
Third Prize in Vietnamese National Mathematics Olympic 2003.