Article
Nanoscience & Nanotechnology
Yihua Lu, Yunduo Yu, Xi Zhu, Min Wang
Summary: The study shows that B6C6N6-1 and B6C6N6-2 are stable 2D BCN structures with good thermal stability and mechanical stability, making them suitable for semiconductor and mechanical applications.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Review
Materials Science, Multidisciplinary
Wenwen Fei, Jens Trommer, Max Christian Lemme, Thomas Mikolajick, Andre Heinzig
Summary: Two-dimensional materials have become a focus of research for their potential in achieving carrier polarity, threshold voltage control, and multifunctional configurations in electronic devices. This review discusses the working principles and performance improvement metrics for 2D-material-based devices with diverse reconfigurability.
Article
Chemistry, Multidisciplinary
Scott Stonemeyer, Mehmet Dogan, Jeffrey D. Cain, Amin Azizi, Derek C. Popple, Austin Culp, Chengyu Song, Peter Ercius, Marvin L. Cohen, Alex Zettl
Summary: Fine control over material synthesis on the nanoscale has allowed for the selective creation of one-dimensional TaTe3 chains or two-dimensional TaTe2 nanoribbons using carbon nanotube reaction vessels. This control extends to the number of chains or the thickness and width of nanoribbons. Transmission electron microscopy and scanning transmission electron microscopy provide detailed atomic structure of the encapsulated materials, revealing complex superstructures such as multichain spiraling and multilayer moire patterns.
Article
Chemistry, Physical
Ziyuan Liu, Lei Tao, Yan-Fang Zhang, Jinbo Pan, Shixuan Du
Summary: Through high-throughput calculations, we have identified 39 two-dimensional ferroelectric materials with low switching barriers and large polarization. These materials include alpha, beta, and gamma phases. Seven of them exhibit ferroelectric switching barriers below 0.3 eV/f.u., polarization larger than 2 x 10(-10) C/m, and high thermodynamic stability. We have also found that larger electronegativity differences result in larger ferroelectric polarization.
Review
Chemistry, Multidisciplinary
Li Wang, Sisi Yin, Jianping Yang, Shi Xue Dou
Summary: 2D layered materials have been widely used as catalysts due to their unique properties. Moire superlattice structure in 2D materials plays a crucial role in modulating their electronic band structure and catalytic performance. However, the investigation of moire superlattice structure in catalytic applications is still in its early stages.
Article
Chemistry, Multidisciplinary
Rui Zhou, Juanxia Wu, Yuansha Chen, Liming Xie
Summary: This review summarizes recent advances in 2D MoTe2, WTe2 and their alloys, including their polymorph structures, preparation methods, physical properties, and potential device applications.
CHINESE JOURNAL OF CHEMISTRY
(2022)
Article
Physics, Multidisciplinary
Rong Guo, Yilv Guo, Yehui Zhang, Xiaoshu Gong, Tingbo Zhang, Xing Yu, Shijun Yuan, Jinlan Wang
Summary: Based on first-principles calculations, the effect of electron doping on Neel-type anti-ferromagnetic GdI3 is studied. It is found that Fermi surface nesting occurs when more than 1/3 electron per Gd is doped, resulting in the failure to obtain a stable ferromagnetic state. Interestingly, GdI3 with appropriate Mg/Ca doping (1/6 Mg/Ca per Gd) turns into a half-metallic ferromagnetic state. This AFM-FM transition is due to the transfer of doped electrons to the spatially expanded Gd-5d orbital and the hybridization between 5d and 4f orbitals.
FRONTIERS OF PHYSICS
(2023)
Review
Physics, Multidisciplinary
Xiaolong Feng, Jiaojiao Zhu, Weikang Wu, Shengyuan A. Yang
Summary: The field of two-dimensional topological semimetals, emerging at the intersection of two-dimensional materials and topological materials, has been rapidly developing in recent years. This review focuses on basic concepts and material examples, as well as discussing outstanding problems that need to be addressed in future research.
Review
Chemistry, Physical
Xuan Song, Teng Zhang, Huixia Yang, Hongyan Ji, Jiatao Sun, Liwei Liu, Yeliang Wang, Hongjun Gao
Summary: This paper reviews the recent progress of TLL electronic features in emerging 2D materials embedded with various 1D nanostructures, including island edges, domain walls, and 1D moire patterns. Novel physical phenomena, such as 1D edge states in 2D transition metal dichalcogenides (TMDs), helical TLL in 2D topological insulators (2DTI), and chiral TLL in 2D quantum Hall systems, are described and discussed at the nanoscale. Challenges and opportunities at the frontier of this research area are also analyzed.
Review
Materials Science, Multidisciplinary
Anupam Chetia, Jayanta Bera, Atanu Betal, Satyajit Sahu
Summary: This review article discusses the mechanism and performance parameters of photodetectors based on low dimensional materials, emphasizing the importance of the advantages and preparation methods of low dimensional materials in improving performance.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Shulong Li, Kah-Meng Yam, Na Guo, Yong Zhao, Chun Zhang
Summary: This study predicts a family of 2D metal-carbon crystals through first-principles calculations, suggests their easy fabrication through self-organizing lattice reconstruction, and highlights their unique electronic and magnetic properties.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Chemistry, Physical
Wanxing Lin, Shi-Dong Liang, Jiesen Li, Dao-Xin Yao
Summary: A novel family of two-dimensional IV-V compounds with good dynamical stability and unique electronic properties has been proposed, which can be used in fields such as photovoltaic devices and thermoelectric materials.
Article
Physics, Applied
Yue Liu, Xiaoxue Shang, Jie Zhuang, Da Li, Tian Cui
Summary: This article reviews the recent research progress on edge reconstruction of typical 2D materials, including the structures, stabilities, and formation mechanism of their edge reconstruction, as well as the properties associated with the edge reconstruction. Challenges and prospects for future research and development are also evaluated.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Feng Xiao, Wen Lei, Wei Wang, Yiping Ma, Xujia Gong, Xing Ming
Summary: In this study, the layer dependent geometry, electronic structure, and optical properties of PdSSe were investigated using first-principles calculations. It was found that the lattice shrinkage effect in the 2D structure is suppressed with increasing number of layers, and the band gap decreases from 2.30 to 0.83 eV. The multilayer PdSSe shows band convergence feature with multi-valley for the conduction band, and the light absorption capability increases with the number of layers. The results suggest the promising application of few layer PdSSe in thermoelectric conversion, solar harvesting, and photocatalysis.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Wei Zhang, Yang Cui, Chuanhui Zhu, Biyi Huang, Yaolin Lou, Shubin Yan
Summary: The tunable electronic properties of two-dimensional γ-GeSe through strain engineering were investigated using density-functional calculations. It was found that uniaxial strains can alter the band structure and create a new conduction band minimum (CBM) due to the active p orbitals of Ge atoms. Additionally, the effective mass distribution of electrons changes from isotropic to anisotropic under strain engineering. The study also showed that pristine γ-GeSe has high electron mobility, which can be switched on/off (415.1/0-25 cm2s 1v 1) by applying strains. These findings enhance our understanding of the controllable electronic properties in stretchable γ-GeSe monolayers and highlight their potential applications in strain-responsive electronic devices.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Physics, Multidisciplinary
Motohiko Ezawa
Summary: This paper investigates the topological property of the Toda lattice model and its relationship with the Su-Schrieffer-Heeger model. The existence of topological edge states in the system is confirmed through the study of isolated zero-mode edge states. Numerical simulations show that the topological phase transition can be observed by observing the dynamics difference of voltage propagation.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Alberto Garcia-Fernandez, Sebastian Svanstrom, Cody M. Sterling, Abhijeet Gangan, Axel Erbing, Chinnathambi Kamal, Tamara Sloboda, Birgit Kammlander, Gabriel J. Man, Hakan Rensmo, Michael Odelius, Ute B. Cappel
Summary: This study investigates the surface properties and electronic structure of lead halide perovskite single crystals using synchrotron-based soft X-ray photoelectron spectroscopy, molecular dynamics simulations, and density functional theory. The results provide reference spectra for photoelectron spectroscopy investigations of polycrystalline thin films and can be used to optimize the design of device interfaces.
Article
Materials Science, Multidisciplinary
Kai Yu Mak, Jing Xia, Xi-Chao Zhang, Li Li, Mouad Fattouhi, Motohiko Ezawa, Xiao-Xi Liu, Yan Zhou
Summary: This study presents the design of Skyrmion-based arithmetic devices built on synthetic antiferromagnetic (SyAF) structures. By introducing geometric notches and tilted edges, the operations of half adder, full adder, and XOR logic gate are successfully executed, significantly improving the performance. These findings offer promising prospects for the development of high-speed spintronic devices.
Article
Multidisciplinary Sciences
Motohiko Ezawa
Summary: In this article, a support vector machine based on a variational quantum-circuit model is used to analyze a binary classification problem. A method is proposed to solve the linear equation of the support vector machine using an F matrix expansion. It is also demonstrated that an arbitrary quantum state can be prepared by optimizing a universal quantum circuit representing an arbitrary U(2(N)) using the steepest descent method. This may be a quantum generalization of Field-Programmable-Gate Array (FPGA).
SCIENTIFIC REPORTS
(2022)
Article
Physics, Condensed Matter
Motohiko Ezawa
Summary: This article introduces the construction of topological corner states in a breathing Kagome lattice by imposing clock symmetry in the complex-energy plane. The researchers also demonstrate the realization of this model in an electric circuit, where the corner states are observed through impedance resonance. Additionally, Z(4) and Z(6) symmetric models are constructed on breathing square and honeycomb lattices.
EUROPEAN PHYSICAL JOURNAL B
(2022)
Article
Physics, Multidisciplinary
Motohiko Ezawa
Summary: This study investigates topological edge states in a topological quasicrystal in the presence of nonlinearity by introducing modulated periodic hoppings. The results show that topological edge states can survive against nonlinearity and that the quasicrystal hopping modulation induces an extended-localization transition.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Multidisciplinary Sciences
Gabriel J. Man, Chinnathambi Kamal, Aleksandr Kalinko, Dibya Phuyal, Joydev Acharya, Soham Mukherjee, Pabitra K. Nayak, Hakan Rensmo, Michael Odelius, Sergei M. Butorin
Summary: This study uncovers a previously hidden feature in the conduction band states of lead halide perovskites and finds that it is strongly influenced by the strength of electronic coupling between the A-cation and bromide-lead sublattice. The findings provide an alternative mechanism for understanding slow hot carrier cooling and emphasize the optoelectronic role of the A-cation.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Motohiko Ezawa, Eric Lebrasseur, Yoshio Mita
Summary: In this study, an Ising machine made of microelectromechanical systems (MEMS) was proposed, where the annealing process is automatically executed by a dissipation mechanism. The machine consists of a series of buckled plates with electrostatic interaction, serving as mechanical memory. By designing Ising machines with different interactions and proposing a fully connected MEMS network, arbitrary combinatorial problems can be solved. This mechanism works at room temperature without the need for an external magnetic field.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Kentaro Ohara, Xichao Zhang, Yinling Chen, Satoshi Kato, Jing Xia, Motohiko Ezawa, Oleg A. Tretiakov, Zhipeng Hou, Yan Zhou, Guoping Zhao, Jinbo Yang, Xiaoxi Liu
Summary: By harnessing the electric current induced Oersted field and temperature-induced perpendicular magnetic anisotropy variation, researchers successfully created isolated skyrmions and bimerons in the same system and found their reversible transformation process, providing a new pathway for building advanced information-processing devices.
Article
Chemistry, Physical
Cody M. Sterling, Chinnathambi Kamal, Alberto Garcia-Fernandez, Gabriel J. Man, Sebastian Svanstrom, Pabitra K. Nayak, Sergei M. Butorin, Hakan Rensmo, Ute B. Cappel, Michael Odelius
Summary: In this study, the electronic structures of methylammonium lead triiodide (MAPI) and methylammonium iodide (MAI) were examined using ab initio molecular dynamics simulations and experimental techniques. The results reveal that the difference in band gap between MAPI and MAI is mainly caused by interactions between iodine and lead.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Review
Physics, Applied
Motohiko Ezawa, Shun Yasunaga, Tetsuya Iizuka, Akio Higo, Yoshio Mita
Summary: We propose a universal quantum computer based on a chain of carbon nanotube rotators with attached metallic plates. The rotational angle phi is the dynamical variable. The attached plate interacts electrostatically with two fixed plates connected to ground. Stable states with phi = 0 and phi = pi are achieved by applying voltage differences. We assign these states to qubit states 0 and 1, and construct universal quantum gates such as arbitrary phase-shift, NOT, and Ising gates by controlling voltage between plates.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2023)
Article
Physics, Multidisciplinary
Jing Xia, Xichao Zhang, Xiaoxi Liu, Yan Zhou, Motohiko Ezawa
Summary: We propose a skyrmion-based universal quantum computer that utilizes the helicity degree of freedom in frustrated magnets. It is shown that the quantum computation can be achieved based on nanoscale skyrmions in a magnetic bilayer system. Single-qubit gates are realized by controlling the electric field and spin current, while the two-qubit gate is achieved through Ising-type exchange coupling. The advantage of this mechanism is the elimination of the need for an external magnetic field. Our results may pave the way for universal quantum computation based on nanoscale topological spin textures.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Applied
R. Rathore, H. Singhal, C. Kamal, J. A. Chakera
Summary: This study investigates the ultrafast response of a semiconductor Ge [111] crystal upon photoexcitation at two pump wavelengths. It reveals that the strain propagation is primarily due to electron diffusion and highlights the long-lasting deformation potential (DP) effect in Ge [111], which provides an opportunity to avoid heating in optoelectronic devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Motohiko Ezawa, Natsuko Ishida, Yasutomo Ota, Satoshi Iwamoto
Summary: We investigate laser emission at the interface of the topological and trivial phases in one dimension. The system is described by a generalized Su-Schrieffer-Heeger model with site-dependent hopping parameters involving the interface width parameter. We obtain a large area single-mode laser by making the interface width wide enough and find a series of analytic solutions of excited states based on supersymmetry quantum mechanics.
Article
Materials Science, Multidisciplinary
Motohiko Ezawa
Summary: This study investigates the nonlinear effect on topological edge states in a Chern insulator with opposite chiralities. The research reveals that, in the presence of nonlinearity, a solitonlike edge state is formed and can propagate unidirectionally along the edge without backscattering or diffraction. This finding is significant for understanding the impact of nonlinear effects on topological states.
