Article
Chemistry, Physical
Lawrence Shi, Qiliang Li
Summary: This study investigated the properties of various materials and identified key characteristics for achieving the quantum spin Hall effect. Furthermore, chemical functionalization was found to be a promising method for transforming certain materials into 2D topological insulators.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Physics, Applied
Pei Zhao, Qiang Wang, Yan Liang
Summary: This study demonstrates the coexistence of intrinsic ferroelectric and topological properties in two-dimensional In2TeS2. The spin of chiral edge states can be flipped by reversing the direction of ferroelectric polarization in single-layer In2TeS2. In In2TeS2 homobilayers, the topological properties are stacking-dependent, and the ferroelectric order can induce topological phase transition between trivial and nontrivial states.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Yang Xue, Wei Xu, Bao Zhao, Jiayong Zhang, Zhongqin Yang
Summary: This paper presents a general proposal for realizing two-dimensional antiferromagnetic quantum spin Hall (QSH) insulators by stacking two-dimensional half-quantum anomalous Hall insulators while maintaining certain symmetries. Using two specific material examples, it is shown that this method can achieve antiferromagnetic QSH insulators with robust edge states and topological invariants.
Review
Chemistry, Multidisciplinary
Michael S. Lodge, Shengyuan A. Yang, Shantanu Mukherjee, Bent Weber
Summary: Atomically thin topological materials, such as the quantum spin Hall insulator, show great potential for applications in quantum computing and electronic devices, with large tunable bulk bandgaps and gapless edge states.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Federico Binda, Stefano Fedel, Santos Francisco Alvarado, Paul Noel, Pietro Gambardella
Summary: The study investigates the spin-orbit torques (SOTs) and spin Hall magnetoresistance generated by Bi0.9Sb0.1(0001) when coupled with FeCo, confirming its effectiveness as a spin-injector material. The research finds that charge-to-spin conversion in single-crystal Bi0.9Sb0.1(0001) is isotropic despite the strong anisotropy of the topological surface states. Additionally, the damping-like SOT displays non-monotonic temperature dependence, with a minimum occurring at 20 K.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fangxue Luo, Xiamin Hao, Yizhen Jia, Junjie Yao, Qingling Meng, Shuwei Zhai, Jinge Wu, Wenzhen Dou, Miao Zhou
Summary: The article discusses the chemical functionalization process of jacutingaite, transitioning from a QSH state to a QAH state. Through calculations and simulations, it was found that 2D halogenated jacutingaite exhibits ferromagnetism and a QAH effect, showing promise for achieving exotic topological phases.
Article
Physics, Multidisciplinary
Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, Yichen Liu, Cheng-Cheng Liu, Yugui Yao, Motohiko Ezawa, Alexander N. Rudenko, Harold J. W. Zandvliet
Summary: We provide experimental evidence of a topological phase transition in germanene, a monoelemental quantum spin Hall insulator. By applying a critical perpendicular electric field, the topological gap is closed and germanene becomes a Dirac semimetal. Further increasing the electric field results in the opening of a trivial gap and the disappearance of metallic edge states. This switching of the topological state induced by an electric field, combined with the large gap, makes germanene suitable for room-temperature topological field-effect transistors, which could revolutionize low-energy electronics.
PHYSICAL REVIEW LETTERS
(2023)
Review
Quantum Science & Technology
Junji Haruyama
Summary: The study of quantum-spin-Hall (QSH) phase in graphene has attracted considerable attention, especially with the use of heavy adatom decoration and heavy substrates, which provides possibilities for next-generation spintronic architectures.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
Article
Physics, Applied
Xin Yang, Yanqing Shen, Jiajia Liu, Lingling Lv, Min Zhou, Yu Zhang, Xianghui Meng, Zhongxiang Zhou, Yangdong Zheng
Summary: The topologically nontrivial phase and quantum anomalous Hall (QAH) effect were predicted in the ferromagnetic non-Dirac half-metal N2Pd4S6 monolayer using first-principles calculations. The N2Pd4S6 monolayer prefers out-of-plane magnetization and exhibits a Curie temperature of similar to 80 K due to dual double-exchange interaction. The introduction of magnetic exchange and spin-orbit coupling enables the realization of the topologically nontrivial phase and QAH state, as well as the unique quantum anomalous valley Hall (QAVH) effect induced by compressive strain.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Slawomir P. Lepkowski
Summary: In this study, the quantum spin Hall effect in InN/InGaN coupled multiple quantum wells is theoretically studied. It is found that a topological insulator can be achieved in triple quantum wells when the In content in the interwell barriers is greater than or equal to the In content in the external barriers. In quadruple quantum wells, a topological insulator phase can only be achieved when the In content in the interwell barriers is larger than in the external barriers.
Article
Multidisciplinary Sciences
F. Rahimi, A. Phirouznia
Summary: The spin-photo current in single layer stanene and germanene under a linearly polarized light is theoretically investigated, and it is found that a pure spin-photo current can be generated in two-dimensional lattices with large intrinsic spin-orbit coupling by considering the simultaneous effect of linear illumination and a vertical external electric field without any magnetic exchange element.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Multidisciplinary
Oleg M. Yevtushenko, Vladimir Yudson
Summary: Understanding the mechanisms that lead to the suppression of helical edge transport in quantum spin Hall systems has attracted significant attention. Despite intensive research and theoretical models, a consistent explanation of experimental results is still lacking. This study systematizes theories of helical transport using spin conservation analysis and identifies setups where the ballistic conductance is robustly protected. The authors review different theories of edge transport in QSH samples and demonstrate the general approach through detailed studies of representative examples.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Junpeng Hou, Ya-Jie Wu, Chuanwei Zhang
Summary: The study investigates topological phase transitions driven by non-Hermiticity, showing that transitions from trivial to quantum spin Hall (QSH) insulators can be induced by varying non-Hermitian terms, and exceptional edge arcs exist in QSH phases. Two topological invariants are established for characterizing the non-Hermitian phase transitions, providing a powerful tool for exploring novel non-Hermitian topological matter and their device applications beyond Chern classes.
Article
Materials Science, Multidisciplinary
Jingwen Jiang, Xiaoqiu Guo, Zhuang Ma, Gui Wang, Yiguo Xu, Xiuwen Zhang
Summary: This research designs a class of large-gap 2D topological insulators, predicts a quantum spin Hall state with a maximum gap of 0.473 eV, and demonstrates the advantages of these designed 2D topological insulators in terms of stability and thermodynamics, which can be used for future spintronic devices and quantum computing.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Physics, Multidisciplinary
Lucia Vigliotti, Alessio Calzona, Bjoern Trauzettel, Maura Sassetti, Niccolo Traverso Ziani
Summary: In this study, we theoretically analyze a long constriction between the helical edge states of a two-dimensional topological insulator and examine the Josephson current in the presence of tunnel-coupling to two superconductors. We find that the Josephson current exhibits anomalous 4 pi-periodicity with respect to the magnetic flux when the two edges are tunnel-coupled to each other. This result not only characterizes the device, but also provides a possible experimental signature of the coupling between the edges, which remains stable against temperature fluctuations.
NEW JOURNAL OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Baojie Feng, Run-Wu Zhang, Ya Feng, Botao Fu, Shilong Wu, Koji Miyamoto, Shaolong He, Lan Chen, Kehui Wu, Kenya Shimada, Taichi Okuda, Yugui Yao
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
Run-Wu Zhang, Zeying Zhang, Cheng-Cheng Liu, Yugui Yao
PHYSICAL REVIEW LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Yan-Mei Dou, Chang-Wen Zhang, Ping Li, Pei-Ji Wang
NANOSCALE RESEARCH LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Jia-Qi Zong, Wei-Xiao Ji, Chang-Wen Zhang, Ping Li, Pei-Ji Wang
JOURNAL OF NANOMATERIALS
(2020)
Article
Chemistry, Physical
Zhao-xia Pang, Wei-xiao Ji, Chang-wen Zhang, Pei-ji Wang, Ping Li
Summary: The two-dimensional tetragonal structures XOBr (X = Tc, Ru) are proposed to be multifermic semiconductors with strong electrical anisotropy, exhibiting coexisting ferromagnetic property and ferroelasticity in films. The direction control of anisotropic electron behaviors can be achieved using a fermelastic switch through external stress. The findings suggest the potential for anisotropic switching in experiments and provide evidence for the design of controllable electronic and memory devices.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Run-Wu Zhang, Xiaodong Zhou, Zeying Zhang, Da-Shuai Ma, Zhi-Ming Yu, Wanxiang Feng, Yugui Yao
Summary: A new quantum state, Weyl monoloop semi-half-metal, with a single loop at the Fermi level yielding 100% spin polarization and protected by mirror symmetry has been discovered. The rutile-type metal fluorides LiV2F6 exhibit fully spin-polarized ultraflat surface states and soft ferromagnetic property, making it a promising candidate for exploring topology and magnetism effects.
Article
Multidisciplinary Sciences
Zhi-Ming Yu, Zeying Zhang, Gui-Bin Liu, Weikang Wu, Xiao-Ping Li, Run-Wu Zhang, Shengyuan A. Yang, Yugui Yao
Summary: In the past decade, there has been a growing interest in exploring emergent particles in condensed matter systems. By conducting systematic symmetry analysis and modeling, the researchers have compiled a complete list of all possible particles in time-reversal-invariant systems and established detailed correspondences between the particles, symmetry conditions, effective models, and topological characteristics. This guide provides concrete guidance for the search and achievement of novel emergent particles in physical systems.
Article
Chemistry, Physical
Xiaodong Zhou, Run-Wu Zhang, Zeying Zhang, Wanxiang Feng, Yuriy Mokrousov, Yugui Yao
Summary: This study proposes a general scheme for realizing topological magneto-valley phase transitions and investigates the sign change of valley-dependent Berry phase effects using valley-half-semiconducting VSi2N4 as an example. By manipulating external factors such as biaxial strain, electric field, and correlation effects, it leads to quantized versions of valley anomalous transport phenomena, providing insights for controlling valley degree of freedom and potential applications in multifunctional quantum devices in valleytronics and spintronics.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Jiadong Zhou, Chao Zhu, Yao Zhou, Jichen Dong, Peiling Li, Zhaowei Zhang, Zhen Wang, Yung-Chang Lin, Jia Shi, Runwu Zhang, Yanzhen Zheng, Huimei Yu, Bijun Tang, Fucai Liu, Lin Wang, Liwei Liu, Gui-Bin Liu, Weida Hu, Yanfeng Gao, Haitao Yang, Weibo Gao, Li Lu, Yeliang Wang, Kazu Suenaga, Guangtong Liu, Feng Ding, Yugui Yao, Zheng Liu
Summary: This study reveals a competitive-chemical-reaction-based growth mechanism that allows for the growth of transition metal chalcogenides and transition metal phosphorous chalcogenides with different compositions and phases. It provides an interesting platform for the exploration of 2D TMPCs and TMCs.
Article
Chemistry, Multidisciplinary
Botao Fu, Xiaotong Fan, Si Li, Da-Shuai Ma, Run-Wu Zhang, Cheng-Cheng Liu
Summary: This study demonstrates the hydrogenation can solve common problems in two-dimensional borophene, such as stability and applicability. By introducing a ladder-like boron hydride sheet, named as 2D ladder polyborane, an ideal scenario with an anisotropic and tilted Dirac cone can be achieved, which can be fully described by a minimal two-band tight-binding model. External fields, such as an electric field or a circularly polarized light field, can effectively induce distinctive massive Dirac fermions, and four types of multi-field-driven topological domain walls with tunable chirality and valley indexes are further established. Moreover, the 2D ladder polyborane is thermodynamically stable at room temperature and supports highly switchable Dirac fermions, providing an ideal platform for realizing and exploring various multi-field-tunable electronic states.
Article
Materials Science, Multidisciplinary
Run-Wu Zhang, Da-Shuai Ma, Jian-Min Zhang, Yugui Yao
Summary: The study explores a fully spin-polarized composite semimetal state in the half-metal material CaFeO3, featuring both 1D nodal lines and 2D nodal surfaces with stable crystal structure and energy dispersion. The nodal lines and surfaces are protected by different symmetry operations, ensuring 2D spin-polarized features near the Fermi level.
Article
Materials Science, Multidisciplinary
J. -M. Zhang, F. Tang, Y. -R. Ruan, Y. Chen, R. -W. Zhang, W. -T. Guo, S. -Y. Chen, J. -P. Li, W. Zhao, W. Zhou, L. Zhang, Z. -D. Han, B. Qian, X. -F. Jiang, Z. -G. Huang, D. Qian, Y. Fang
Summary: Magnetic topological semimetals are a novel state of quantum matter with nontrivial band topology. External stimuli can alter their spin states and Fermi surface characteristics. Through experiments and calculations on HoSb in different magnetic states, it was found that the topological features change with the magnetic transition.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Xin-Yang Li, Wei-Xiao Ji, Pei-Ji Wang, Chang-Wen Zhang
Summary: This study proposes the realization of Half Dirac semimetals (HDS) in two-dimensional Kagome transition-metal nitride Cd2N3 based on first-principles calculations, which exhibits high Curie temperature and the quantum anomalous Hall effect. The results suggest monolayer transition-metal nitrides as a promising platform to explore novel 2D emergent HDSs and QAH insulators, stimulating interest in practical spintronics devices.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Physical
Xin-Yang Li, Meng-Han Zhang, Miao-Juan Ren, Chang-Wen Zhang
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Meng-Han Zhang, Shu-Feng Zhang, Pei-Ji Wang, Chang-Wen Zhang
Article
Materials Science, Multidisciplinary
Mengjiao Dong, Liyun Liao, Chensheng Li, Yingxiao Mu, Yanping Huo, Zhong-Min Su, Fushun Liang
Summary: This study investigates the influence of the polarity of polymer matrices on persistent room-temperature phosphorescence (pRTP). It is discovered that intense phosphorescence emission can be achieved in highly polar matrices such as polyacrylic acid (PAA). The dipole-dipole interaction between the polar fluorophore and polar matrix is proposed to stabilize the excited state and facilitate the generation of efficient room-temperature phosphorescence emissions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Han-Jiang Yang, Weijia Xiang, Xiangzhou Zhang, Jin-Yun Wang, Liang-Jin Xu, Zhong-Ning Chen
Summary: This article reports a 2D copper(I)-based cluster material for X-ray imaging, which exhibits ultra-high spatial resolution, high photoluminescence efficiency, and low detection limit. The material shows excellent linear response to X-ray dose rates and light output, and has the best spatial resolution among reported lead-free metal halide hybrids.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Review
Materials Science, Multidisciplinary
Taek Joon Kim, Sang-hun Lee, Dayeong Kwon, Jinsoo Joo
Summary: Donor-acceptor heterostructures using organic-inorganic halide perovskites, two-dimensional transition metal dichalcogenides, pi-conjugated organic small/macro molecules, and quantum dots are promising platforms for exciton-based photonics and optoelectronics. Hetero-interlayer excitons and hetero-intermolecular excitons formed through optical and/or electrical charge transfer in various heterostructures are important quasi-particles for light emission, detection, and harvesting systems.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Liemao Cao, Xiaohui Deng, Zhen-kun Tang, Rui Tan, Yee Sin Ang
Summary: We investigate the interface properties between WSi2N4 and Mo2B, O-modified Mo2B, and OH-modified Mo2B nanosheets. We find that WSi2N4 and Mo2B form n-type Schottky contacts, while functionalizing Mo2B with O and OH leads to the formation of both n-type and p-type ohmic contacts with WSi2N4. Additionally, we demonstrate the emergence of quasi-ohmic contact with ultralow lateral Schottky barrier and zero vertical interfacial tunneling barriers in Mo2B(OH)2-contacted WSi2N4.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ga Eun Kim, Hae-Jin Kim, Heesuk Jung, Minwoo Park
Summary: This study presents a solution to the commercialization challenges of flexible LEDs based on MAPbBr(3) by incorporating polyurethane and an In-Ga-Zn-Sn liquid alloy. The designed devices showed high flexibility, efficiency, and durability, with improved electron injection and reduced defects, making them promising for next-generation displays.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tao Shen, Zeng Wu, Zhen Jiang, Dongsheng Yan, Yan Zhao, Yang Wang, Yunqi Liu
Summary: Sidechain engineering is an important molecular design strategy for tuning the solid-state packing and structural ordering of conjugated polymers. The effects of sidechain direction on the optoelectronic properties of polymers and device performance were systematically investigated in this study. The results demonstrate that tuning the sidechain substitution direction can effectively improve the molecular structure and light absorption properties of polymers, providing new insights for the rational design of functional polymers.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Lotte Clinckemalie, Bapi Pradhan, Roel Vanden Brande, Heng Zhang, Jonathan Vandenwijngaerden, Rafikul Ali Saha, Giacomo Romolini, Li Sun, Dirk Vandenbroucke, Mischa Bonn, Hai I. Wang, Elke Debroye
Summary: In this study, a facile strategy using a non-conductive polymer was proposed to fabricate stable, pinhole-free thick films. The effect of introducing a second phase into CsPbBr3 perovskite crystals on their photophysical properties and charge transport was investigated. The dual phase devices exhibited improved stability and more effective operation at higher voltages in X-ray detection.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jingye Zou, Shenglan Hao, Pascale Gemeiner, Nicolas Guiblin, Omar Ibder, Brahim Dkhil, Charles Paillard
Summary: When rare-earth ions are embedded in a ferroelectric material, their photoluminescence can serve as an all-optical probe for temperature, electric field, and mechanical stimulus. However, the impact of ferroelectric phase transitions on photoluminescence is not well understood. In this study, we demonstrate changes in the photoluminescence of green emission bands during critical ferroelectric transitions in an Er-doped BaTiO3 material. We also find that the intensity ratio and wavelength position difference of sub-peaks provide information on the phase transitions.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Jiangchao Han, Daming Zhou, Wei Yang, Chen Lv, Xinhe Wang, Guodong Wei, Weisheng Zhao, Xiaoyang Lin, Shengbo Sang
Summary: Rare type-II spin-gapless semiconductors (SGSs) have attracted increasing attention due to their unique spin properties. In this study, the interface contacts and spin transport properties of different devices composed of VSi2P4 ferromagnetic layers were investigated. The results show that VSi2P4 is a promising material for designing vertical van der Waals heterostructures with a giant tunnel magnetoresistance (TMR) in spintronic applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Tianqi Zhao, Renagul Abdurahman, Qianting Yang, Ruxiangul Aiwaili, Xue-Bo Yin
Summary: In this study, we designed and prepared Cr and Ba-doped gamma-Ga2O3 nanoparticles to achieve near-infrared emission and enhance the emission intensity. The emission mechanism was proposed based on the trap depth, band gap, and energy levels of Cr ions. The ratiometric temperature sensing and encryption information transfer demonstrated the potential applications of this technology.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Shuvankar Gupta, Jyotirmoy Sau, Manoranjan Kumar, Chandan Mazumdar
Summary: In this study, a new spin-gapless semiconductor material CoFeMnSn is reported, and its stable structure and spin-polarized band structure are determined through experimental realization and theoretical calculations. The compound exhibits a high ferromagnetic transition temperature, making it excellent for room temperature applications. The nearly temperature-independent resistivity, conductivity, and carrier concentration of the compound, adherence to the Slater-Pauling rule, and the high intrinsic anomalous Hall conductivity achieved through hole doping further confirm its spin-gapless semiconductor nature. Additionally, the compound's SGS and topological properties make it suitable for spintronics and magneto-electronics devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Ikumi Aratani, Yoji Horii, Yoshinori Kotani, Hitoshi Osawa, Hajime Tanida, Toshiaki Ina, Takeshi Watanabe, Yohko F. Yano, Akane Mizoguchi, Daisuke Takajo, Takashi Kajiwara
Summary: In this study, two-dimensional arrays of single-molecule magnets (SMMs) based on metal-organic frameworks (MOFs) were systematically modified through Langmuir-Blodgett methods and chemical modifications. The introduction of bulky alkoxide groups induced structural changes and perpendicular magnetic anisotropy. This research provides a promising strategy for the construction of high-density magnetic memory devices using molecular spintronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Zonghao Lei, Houhe Dong, Lijie Sun, Bing Teng, Yanfei Zou, Degao Zhong
Summary: Researchers have successfully developed four different up-conversion phosphors based on the Eulytite-type host Ba3Yb(PO4)(3). The optical temperature sensing properties of these phosphors were thoroughly investigated, and it was found that Ba3Yb(PO4)(3):Tm/Er/Ho showed potential for optical temperature measurement applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
C. Roncero-Barrero, M. A. Carvajal, J. Ribas-Arino, I. de P. R. Moreira, M. Deumal
Summary: This study computationally investigates the conductivity of four isostructural compounds with different Se contents, and reveals the parameters that define their conductivity in stable organic radical materials. The results provide insights into the influence of Se content on the conductivity and highlight the importance of considering multiple parameters in understanding the trends in conductivity.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)
Article
Materials Science, Multidisciplinary
Remi Arras, Kedar Sharma, Lionel Calmels
Summary: In this study, we investigated the interplay between structural defects in NiFe2O4, showing that the complex formed by a Ni-Oh/Fe-Td-cation swap and a neutral oxygen vacancy is more stable than these two isolated defects, and significantly reduces the width of the minority-spin band gap.
JOURNAL OF MATERIALS CHEMISTRY C
(2024)