Article
Physics, Condensed Matter
Nguyen Van Men
Summary: In this study, the plasmon properties in N-layer silicene systems were investigated, considering the spin-orbit coupling effect. The results show that the frequencies of plasmonic collective excitations increase with the number of layers and are less influenced by the bandgap. Furthermore, the imbalanced carrier density between silicene layers significantly affects the plasmon frequencies.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Van-Men Nguyen
Summary: This study investigates the effects of temperature and the inhomogeneity of background dielectric on collective excitations in a multilayer graphene structure. The results indicate that temperature affects the acoustic plasmon frequency and the optical plasmon frequency in different ways. Additionally, temperature causes energy loss in the plasmon modes, even outside the single-particle excitation region. The inhomogeneity of background dielectric reduces plasmon energy and damping rate, as well as the influence of temperature and interlayer separation on collective excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Condensed Matter
Nguyen Van Men, Dong Thi Kim Phuong
Summary: This study investigates collective excitations in a double-layer graphene structure through numerical calculations, finding that temperature, doping density, and carrier density have significant effects on plasmon frequencies.
SOLID STATE COMMUNICATIONS
(2021)
Article
Physics, Applied
Dong Thi Kim Phuong, Nguyen Van Men
Summary: We studied the frictional drag phenomenon in a double-layer system consisting of two parallel gapped graphene layers by calculating the Coulomb drag resistivity. The Coulomb drag resistivity in double-layer gapped graphene systems shows interesting different features compared to other double-layer systems. The temperature steadily increases the Coulomb drag resistivity in the system, while the interlayer distance quickly decreases it. A finite bandgap has remarkable contributions to the frictional drag phenomenon, and it is necessary to consider this factor in calculations for better agreement with experimental works.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Multidisciplinary
Jinyi Zhang, Christoph Eigen, Wei Zheng, Jake A. P. Glidden, Timon A. Hilker, Samuel J. Garratt, Raphael Lopes, Nigel R. Cooper, Zoran Hadzibabic, Nir Navon
Summary: The decay mechanism of the gapped lowest-lying axial excitation of a quasipure atomic Bose-Einstein condensate confined in a cylindrical box trap is studied, revealing that the damping mechanism is exclusively nonlinear. This nonlinear damping is explained as a process where two quanta of the gapped lowest excitation mode couple to a higher-energy mode, which subsequently decays into a continuum. Experimental results show quantitative agreement with the predictions of this model, and third-harmonic generation is observed when the system is strongly driven below its lowest resonant frequency, indicating nonlinear behavior.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Condensed Matter
Van Men Nguyen, Kim Phuong Dong Thi
Summary: In this paper, collective excitations in an M-BLG heterostructure were studied. The results showed that the heterostructure had two solutions corresponding to optical and acoustical modes, with significantly higher energy compared to DBLG and DLG systems with similar parameters. As temperature increased, the frequency of the acoustical mode steadily increased, while the frequency of the optical mode only increased in large wave vector regions, with different results for different interlayer separations. Interestingly, the effects of carrier density in graphene on plasmon properties of M-BLG heterostructures sharply differed from those in both BLG and DLG systems.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Physics, Condensed Matter
Nguyen Van Men, Nguyen Quoc Khanh, Dang Khanh Linh
Summary: The study explores zero-temperature plasmon modes in a double-layer bilayer graphene structure under a perpendicular electrostatic bias. Results show the presence of two undamped collective modes in the long wavelength limit, with the finite potential bias significantly decreasing the plasmon energy and causing Landau damping at higher wave-vectors. The dependence of plasmon dispersions on system parameters remains similar with and without electrostatic bias.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Multidisciplinary
Weiyao Ke, Yi Yin
Summary: We investigate the response of the near-equilibrium quark-gluon plasma (QGP) to perturbation at nonhydrodynamic gradients. We propose a conceivable scenario under which sound mode continues to dominate the medium response in this regime. Such a scenario has been observed experimentally for various liquids and liquid metals. We further show that this extended hydrodynamic regime (EHR) indeed exists for both the weakly coupled kinetic equation in the relaxation time approximation (RTA) and the strongly coupled N = 4 supersymmetric Yang-Mills (SYM) theory. We construct a simple but nontrivial extension of Muller-Israel-Stewart (MIS) theory-namely MIS*-and demonstrate that it describes the EHR response for both the RTA and SYM theory. This indicates that MIS* equations can potentially be employed to search for QGP EHR via heavy-ion collisions.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Ammar Kirmani, Kieran Bull, Chang-Yu Hou, Vedika Saravanan, Samah Mohamed Saeed, Zlatko Papic, Armin Rahmani, Pouyan Ghaemi
Summary: This article introduces a method to study the geometric properties and graviton dynamics of fractional quantum Hall states using intermediate-scale quantum technologies. The authors simulate geometric quench and graviton dynamics on the IBM quantum computer and develop an efficient variational quantum algorithm for simulating graviton dynamics in larger systems.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Sujit Narayanan, Malcolm P. Kennett
Summary: We study the collective excitations of fractional quantum Hall states in graphene, focusing on states allowing for chiral symmetry breaking orders, such as antiferromagnetism and charge density wave order. Numerical investigations are conducted to explore how the collective excitation spectra depend on filling and the flux attachment scheme for two classes of variational states, namely the Toke-Jain sequence and the Modak-Mandal-Sengupta sequence.
Article
Optics
Peng Xu, Wenxian Zhang
Summary: A generalized Mathieu equation (GME) is proposed to describe the dynamics of two different models in spin-1 Bose-Einstein condensates, showing significant differences from Mathieu's equation and allowing the description of generalized parametric resonance. The GME can distinguish between the two equations when epsilon is greater than or equal to 1 and delta is approximately 0.25, explaining experimental results, predicting behavior, and easily implemented in experiments for both nematic and spin space models.
Review
Nanoscience & Nanotechnology
Kaoru Toko, Hiromasa Murata
Summary: Low-temperature synthesis of multilayer graphene (MLG) through layer exchange (LE) phenomenon offers high electrical conductivity and high-quality MLG, making it suitable for various device applications.
Article
Physics, Multidisciplinary
Ziyu Liu, Ursula Wurstbauer, Lingjie Du, Ken W. West, Loren N. Pfeiffer, Michael J. Manfra, Aron Pinczuk
Summary: This study investigates the impacts of domain textures on low-lying neutral excitations in bulk fractional quantum Hall effect (FQHE) systems using resonant inelastic light scattering. The research demonstrates that large domains of quantum fluids support long-wavelength neutral collective excitations with well-defined wave vector dispersion, which can be explained by theories for uniform phases. The accessibility of dispersive low-lying neutral collective modes, such as long wavelength magnetorotons at filling factor v = 1/3, in large domains of FQHE fluids offers significant experimental access to strong electron correlation physics in the FQHE.
PHYSICAL REVIEW LETTERS
(2022)
Article
Optics
Gennadiy Burlak, Gustavo Medina-angel
Summary: This study explores the extended dynamics and laser emission of randomly distributed nanoemitters incorporated into a three-dimensional array of dispersing single-walled carbon nanotubes enhanced by plasmon-polariton excitation. It was found that if the plasmonic frequency of the carbon nanotubes exceeds the critical value, plasmon-polariton excitation is macroscopically excited throughout the system. The laser generation time of the nanoemitters depends significantly on the plasmonic frequency in the carbon nanotubes.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2023)
Article
Engineering, Electrical & Electronic
Ali Mehrdadian, Keyvan Forooraghi, Keyhan Hosseini
Summary: This article extends the method of lines (MoL) to analyze 2-D multilayer structures loaded with graphene plates in cylindrical coordinates. The admittance transformation matrices on all the planes of the multilayer structure are derived taking into account the tensor-form conductivity of the magnetized graphene plate. A technique to obtain the characteristic equation and propagation constant of the structure is proposed by matching the fields at the interfaces loaded with graphene. The proposed method is validated by comparing the results with COMSOL simulations and has potential applications in tunable microwave attenuators and phase shifters.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Nguyen Van Men, Nguyen Quoc Khanh, Dong Thi Kim Phuong
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2020)
Article
Physics, Multidisciplinary
Nguyen Van Men, Dong Thi Kim Phuong
Article
Physics, Condensed Matter
Dong Thi Kim Phuong, Nguyen Van Men
SOLID STATE COMMUNICATIONS
(2020)
Article
Physics, Multidisciplinary
Nguyen Van Men
Article
Physics, Condensed Matter
Phuong Dong Thi Kim, Men Van Nguyen
Summary: In this study, we calculated collective excitations and damping rate in a double layer structure comprising one monolayer gapped graphene sheet and a GaAs quantum well using random-phase approximation at zero temperature. We found that both in-phase optical and out-of-phase acoustic plasmon modes exist in the system, with different responses to quantum well width and exchange-correlation effects. Taking into account local-field correction led to a decrease in only the AC plasmon frequency, mainly in the large wave-vectors region.
EUROPEAN PHYSICAL JOURNAL B
(2021)
Article
Physics, Condensed Matter
Nguyen Van Men, Nguyen Quoc Khanh, Dong Thi Kim Phuong
Summary: This study calculates the plasmon frequency and damping rate of plasma oscillations in a spin-polarized bilayer graphene system. It shows that the degree of spin polarization has a negligible effect on the long wavelength plasmon frequency but affects the damping rate and frequency changes with increasing spin polarization. Moreover, an increase in carrier density significantly decreases both the plasmon frequency and damping rate, while the critical wave vector decreases with spin polarization and can be used to experimentally determine the degree of spin polarization.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2021)
Article
Physics, Applied
Van-Men Nguyen, Kim-Phuong Thi Dong
Summary: The study investigates plasmon excitations in a double-layer structure, revealing the existence of two plasmon modes in the system. The optical mode continues in the interband single-particle excitation area, while the acoustic mode only crosses the intraband single-particle excitation boundary and disappears. Plasmon frequency is affected by separation and carrier density, with temperature having a weaker impact on plasmon properties compared to other factors.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2021)
Article
Physics, Condensed Matter
Nguyen Van Men, Dong Thi Kim Phuong
Summary: This study investigates collective excitations in a double-layer graphene structure through numerical calculations, finding that temperature, doping density, and carrier density have significant effects on plasmon frequencies.
SOLID STATE COMMUNICATIONS
(2021)
Article
Physics, Applied
Kim-Phuong Dong-Thi, Van-Men Nguyen
Summary: The study reveals that the plasmon properties of four parallel monolayer graphene (4-MLG) sheets in an inhomogeneous background dielectric differ significantly from those in a homogeneous system, resulting in smaller plasmon frequencies and different directions of acoustic plasmon branch movement.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2022)
Article
Physics, Condensed Matter
Nguyen Van Men
Summary: In this study, the plasmon properties in N-layer silicene systems were investigated, considering the spin-orbit coupling effect. The results show that the frequencies of plasmonic collective excitations increase with the number of layers and are less influenced by the bandgap. Furthermore, the imbalanced carrier density between silicene layers significantly affects the plasmon frequencies.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2022)
Article
Physics, Condensed Matter
Nguyen Van Men, Nguyen Quoc Khanh, Dang Khanh Linh
Summary: The study explores zero-temperature plasmon modes in a double-layer bilayer graphene structure under a perpendicular electrostatic bias. Results show the presence of two undamped collective modes in the long wavelength limit, with the finite potential bias significantly decreasing the plasmon energy and causing Landau damping at higher wave-vectors. The dependence of plasmon dispersions on system parameters remains similar with and without electrostatic bias.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Nanoscience & Nanotechnology
Van-Men Nguyen
Summary: This study investigates the effects of temperature and the inhomogeneity of background dielectric on collective excitations in a multilayer graphene structure. The results indicate that temperature affects the acoustic plasmon frequency and the optical plasmon frequency in different ways. Additionally, temperature causes energy loss in the plasmon modes, even outside the single-particle excitation region. The inhomogeneity of background dielectric reduces plasmon energy and damping rate, as well as the influence of temperature and interlayer separation on collective excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Applied
Dong Thi Kim Phuong, Nguyen Van Men
Summary: We studied the frictional drag phenomenon in a double-layer system consisting of two parallel gapped graphene layers by calculating the Coulomb drag resistivity. The Coulomb drag resistivity in double-layer gapped graphene systems shows interesting different features compared to other double-layer systems. The temperature steadily increases the Coulomb drag resistivity in the system, while the interlayer distance quickly decreases it. A finite bandgap has remarkable contributions to the frictional drag phenomenon, and it is necessary to consider this factor in calculations for better agreement with experimental works.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Physics, Multidisciplinary
V-M Nguyen
Summary: In this study, the Coulomb bare interactions in a 5-layer graphene structure were analytically calculated in an inhomogeneous background dielectric. The results showed that the inhomogeneity of the dielectric environment significantly affected the intra- and interlayer Coulomb bare interactions, leading to noticeable differences in values at critical momentum. Additionally, in the long-wavelength limit, interactions between charged particles in the structure were found to depend only on the dielectric constant of the outermost layers.
INDIAN JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Nguyen Van Men, Nguyen Quoc Khanh, Dong Thi Kim Phuong
ROMANIAN JOURNAL OF PHYSICS
(2020)
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
