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Magnetization-Induced Higher-Order Topological Effects in Quantum Spin Hall Insulators 认领 引用
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作者 Xiang-Long Yu Jie Wang +2 位作者 Pei-Hao Fu Da-Yong Liu Dao-Xin Yao 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期135-138,I0106-I0114,共4页
Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order top... Higher-order topological phases offer a promising platform for low-dissipation electronic and spintronic devices,motivating the search for experimentally accessible control schemes.Here we investigate higher-order topological states in a rhombic geometry of two-dimensional group-IVA materials subjected to external magnetic fields,described by a modified Kane-Mele model with next-nearest-neighbor Rashba spin-orbit coupling.We identify two distinct types of corner modes governed by different physical mechanisms:under out-ofplane magnetization,corner states emerge at the acute angles due to boundary hybridization induced by spin-orbit coupling,whereas under in-plane magnetization,corner modes appear at the obtuse angles as topologically protected Jackiw-Rebbi solitons arising at the domain wall between boundaries with different topological invariants.Using first-principles-based parameters for realistic materials including silicene,germanene,and stanene,we show that the obtuse-angle corner states are robust and enhanced in systems with stronger spin-orbit coupling.Our results establish a feasible route for magnetically creating and controlling higher-order topological states,enabling reconfigurable corner-mode-based topological devices. 展开更多
关键词 corner modes external magnetic fieldsdescribed identify two distinct types corner modes external magnetic fields physical mechanisms magnetization quantum spin hall insulators experimentally accessible control schemeshere
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Tunable Correlated Chern Insulators with Giant Magnetic Anisotropy 认领 引用
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作者 Qingzhao Yao Hongyan Zhao +2 位作者 Wei Xu Hongguo Zhang Zhongqin Yang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第6期53-59,I0042-I0055,共7页
Achieving a high-temperature quantum anomalous Hall(QAH)effect remains an experimental challenge despite extensive research.One key limitation is the typically small magnetic anisotropy energy(MAE),generally 1 meV,whi... Achieving a high-temperature quantum anomalous Hall(QAH)effect remains an experimental challenge despite extensive research.One key limitation is the typically small magnetic anisotropy energy(MAE),generally 1 meV,which severely restricts the stability of long-range magnetism in two-dimensional(2D)materials.In this work,we design a monolayer LiCoTe(with ferromagnetic TC=535 K)from first-principles calculations.A giant MAE value of 40.4 meV is observed for LiCoTe by applying 3.5%strain.A topological transition(from the half metal to the QAH state with Chern number C=−1)as well as a large global QAH band gap(up to 266 meV)is achieved under certain strain.Based on a tight-binding model,an orbital multiplet tuning mechanism involving dxz/yz and dx2-y2orbitals is proposed to rationalize the giant MAE and large QAH band gap.Our findings provide a promising pathway for achieving high-temperature 2D ferromagnets and Chern insulators in real correlated materials. 展开更多
关键词 orbital multiplet tuning mechanism monolayer licote d xz yz dx y orbitals high temperature quantum anomalous hall effect small magnetic anisotropy energy mae generally giant magnetic anisotropy tunable correlated chern insulators first principles calculations
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Energy harvesting based on corner states with tunable elastic higher-order topological insulators 认领 引用
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作者 Gang Zhang Songyang Fu Yuanwen Gao 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第5期431-445,共15页
In recent years,the devices for piezoelectric energy harvesting based on phononic crystals have gained increasing prominence in the field of acoustic/elastic wave energy harvesting,owing to their ability to concentrat... In recent years,the devices for piezoelectric energy harvesting based on phononic crystals have gained increasing prominence in the field of acoustic/elastic wave energy harvesting,owing to their ability to concentrate acoustic/elastic waves and vibration energy at specific locations.However,these devices face challenges related to robustness and efficiency degradation caused by structural defects or disturbances.To tackle this challenge,we introduce a novel piezoelectric energy harvesting utilizing elastic higher-order topological insulators in this study.Numerical modeling and experimental data collectively reveal that the attachment of a piezoelectric patch at the corner points effectively harvests elastic wave energy.Moreover,leveraging the topological protection effect,the device maintains excellent elastic wave energy harvesting capability even in the presence of point defects.Additionally,we introduce magnetostrictive materials for tuning the frequencies of corner states under different magnetic fields through numerical calculations.The results indicate that by applying various magnetic fields,it is possible to tune the corner states to match desired operating frequencies.This research presents valuable perspectives and actionable guidelines to inform the design of innovative elastic wave energy harvesting systems. 展开更多
关键词 Higher-order topological insulator Piezoelectric energy harvesting Phononic crystals Energy localization Magnetic field
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Sub-Pixel-Level Visual Inspection System for Dimensional Measurement of Ceramic Insulators Based on Halcon:Design and Implementation 认领 引用
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作者 Yuehua Cao Jiajie Han +1 位作者 Hanyang Zhu Ge Yuan 《Journal of Electronic Research and Application》 2026年第3期62-72,共11页
Aiming at the problems of low efficiency,poor accuracy consistency,and reliance on empirical judgment in the manual dimension inspection of ceramic insulators during the production process,a sub-pixel-level visual ins... Aiming at the problems of low efficiency,poor accuracy consistency,and reliance on empirical judgment in the manual dimension inspection of ceramic insulators during the production process,a sub-pixel-level visual inspection system based on the Halcon platform was designed.Taking the 95-porcelain insulators with a 60×60 specification as the research object,a three-layer inspection architecture of“hardware acquisition-software processing-data output”was constructed.Through key technologies such as camera calibration,distortion correction,sub-pixel contour extraction,and template matching,the automatic measurement of three core dimensions of the insulator,namely height,width,and shed distance,was achieved.The experimental results show that the detection error of this system is controlled within the range of 0.5-1.2mm,the detection success rate reaches 99.2%,the detection time per sample is 2s,and the efficiency is 40%higher than that of traditional manual inspection.It can accurately meet the dimension inspection requirements of“GB/T 772-2005 Technical Conditions for Porcelain Insulators for High-voltage Overhead Lines”.This system requires no human intervention,and the detection results are stable and reliable.It provides an efficient solution for the on-line quality control in the production process of ceramic insulators and has important engineering application value. 展开更多
关键词 Ceramic insulators Machine vision Halcon Sub-pixel detection Calibration method Dimension measurement Distortion correction PLC control Zhang Zhengyou
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Photogalvanic effects in surface states of topological insulators under perpendicular magnetic fields 认领 引用
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作者 Haoyu Li Kainan Chang +1 位作者 Wang-Kong Tse Jin Luo Cheng 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第5期422-431,共10页
We present a theoretical study of the nonlinear magneto-optical shift conductivity in the surface states of the prototypical topological insulator Bi2Se3under a perpendicular quantizing magnetic field.By describ... We present a theoretical study of the nonlinear magneto-optical shift conductivity in the surface states of the prototypical topological insulator Bi2Se3under a perpendicular quantizing magnetic field.By describing the electronic states as Landau levels and using a perturbative approach,we derive the microscopic expression for the shift conductivityσ(2;αβγ)(-ω,ω),whereα,β,γ=±stand for the circular polarization of light andωis the light frequency;the spectra are further decomposed into contributions from the interband and intraband optical transitions,for which the selection rules are identified.Considering that the system possesses C3 point group of symmetry,the nonzero components of the conductivity tensor areσ(2;-++)=[σ(2;+--)]*.Therefore,a pure circularly polarized light generates zero shift current.In the clean limit,the conductivities are nonzero only for discrete photon energies because of the discrete Landau levels and energy conservation,and they become Lorentzian lineshapes with the inclusion of damping,which relaxes the condition of energy conservation.The dependence of the spectra on the damping parameters,the magnetic fields,and the chemical potentials is investigated in detail.Our results reveal that the shift current is highly tunable by the chemical potential and the magnetic field.These results underscore the potential of topological insulators for tunable,strong nonlinear magneto-optical applications. 展开更多
关键词 shift current topological insulator surface states Landau level selection rules nonlinear magneto-optical effect
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Substrate Design and Multistate Manipulation of Ferroelectric Topological Insulators 认领 引用
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作者 Xinyang Gao Bao Zhao +2 位作者 Yanxing Zhang Zongxian Yang Ruqian Wu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第11期222-237,共16页
Ferroelectric topological insulators realized in heterostructures of two topologically trivial two-dimensional materials have recently attracted significant interest. Using first-principles calculations combined with ... Ferroelectric topological insulators realized in heterostructures of two topologically trivial two-dimensional materials have recently attracted significant interest. Using first-principles calculations combined with topological quantum chemistry, we investigate bilayer α-In2 Se3(2 L-In2 Se3) in van der Waals heterostructures with XSe(X = Ga, In, Tl) substrates within space group P 3m1(No. 156). We show that the emergence of ferroelectricity-driven topological phase transitions in these systems is dictated by fundamental symmetry principles rather than material-specific effects. The band bending at the XSe/2 L-In2 Se3 interface enables topological band inversions, with higher-electron-affinity substrates such as GaSe and TlSe favoring the transition. Remarkably, GaSe/2 L-In2 Se3 exhibits a reversible transition between topological and trivial insulating phases upon polarization switching, while TlSe/2 L-In2 Se3 undergoes sequential transitions from a topological insulator to a trivial insulator and eventually to a metallic state. This multistate manipulation highlights a viable route for designing tunable, low-power, multi-functional electronic devices. 展开更多
关键词 ferroelectric topological insulators symmetry principles van der waals heterostructures heterostructures topological insulators band bending topological quantum chemistry ferroelectricity
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Topological Euler insulators and metals on triangular lattices 认领 引用
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作者 Mei-Song Wei Jingping Xu Yaping Yang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2025年第12期187-192,共6页
The topological phases and edge states of a topological Euler insulator on a triangular lattice is studied.Differently from two-band Chern insulators,a topological Euler insulator is a kind of three-band model,describ... The topological phases and edge states of a topological Euler insulator on a triangular lattice is studied.Differently from two-band Chern insulators,a topological Euler insulator is a kind of three-band model,described by the Euler number not the Chern number.The spin textures of a topological Euler insulator in the momentum space is like a Néel-type skyrmion.It is found that the topological edge states exist in the band gap of the topological Euler insulator,and the topological Euler insulator can be transformed into a topological metal without the topological phase transition. 展开更多
关键词 topological euler insulators topological insulators topological metals topological phase
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Intrinsic higher-order topological states in two-dimensional honeycomb quantum spin Hall insulators 认领 引用
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作者 Sibin Lü Jun Hu 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第11期499-504,共6页
The exploration of topological phases remains a cutting-edge research frontier,driven by their promising potential for next-generation electronic and quantum technologies.In this work,we employ first-principles calcul... The exploration of topological phases remains a cutting-edge research frontier,driven by their promising potential for next-generation electronic and quantum technologies.In this work,we employ first-principles calculations and tightbinding modeling to systematically investigate the topological properties of freestanding two-dimensional(2D)honeycomb Bi,HgTe,and Al2O3(0001)-supported HgTe.Remarkably,all three systems exhibit coexistence of intrinsic first-and higher-order topological insulator states,induced by spin-orbit coupling(SOC).These states manifest as topologically protected gapless edge states in one-dimensional(1D)nanoribbons and symmetry-related corner states in zero-dimensional(0D)nanoflakes.Furthermore,fractional electron charges may accumulate at the corners of armchair-edged nanoflakes.Among these materials,HgTe/Al2O3(0001)is particularly promising due to its experimentally feasible atomic configuration and low-energy corner states.Our findings highlight the importance of exploring higher-order topological phases in quantum spin Hall insulators and pave the way for new possibilities in device applications. 展开更多
关键词 higher-order topological insulators two-dimensional honeycomb lattice quantum spin Hall insulators
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Interplay between the Pseudogap and Superconductivity in Doped Mott Insulators:a Cluster Dynamical Mean-Field Theory Study 认领 引用
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作者 Jinbin Liu Dao-Xin Yao Wei Wu 《Chinese Physics Letters》 SCIE EI CAS CSCD 2025年第8期264-269,共6页
We investigate the interplay between the pseudogap state and d-wave superconductivity in the two-dimensional doped Hubbard model by employing an eight-site cluster dynamical mean-field theory method.By tuning electron... We investigate the interplay between the pseudogap state and d-wave superconductivity in the two-dimensional doped Hubbard model by employing an eight-site cluster dynamical mean-field theory method.By tuning electron hopping parameters,the strong-coupling pseudogap in the two-dimensional Hubbard model can be either enhanced or suppressed in the doped Mott insulator regime.We find that in underdoped cases,the closing of pseudogap leads to a significant enhancement of superconductivity,indicating competition between the two in the underdoped regime.In contrast,at large dopings,suppressing the pseudogap is accompanied by a concurrent decrease in the superconducting transition temperature Tc,which can be attributed to a reduction in antiferromagnetic correlations behind both the pseudogap and superconductivity.We elucidate this evolving relationship between pseudogap and superconductivity across different doping regimes. 展开更多
关键词 doped mott insulator regimewe pseudogap tuning electron hopping parametersthe closing pseudogap doped mott insulators competition b cluster dynamical mean field theory electron hopping
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Influence of surface contamination on electric field distribution of insulators 认领 引用
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作者 Xingcai Li Yingge Liu Juan Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第3期367-379,共13页
Atmospheric particle adsorption on insulator surfaces,coupled with humid environments,significantly affects contamination flashover,necessitating a clear understanding of the electric field distribution on insulator s... Atmospheric particle adsorption on insulator surfaces,coupled with humid environments,significantly affects contamination flashover,necessitating a clear understanding of the electric field distribution on insulator surfaces with adsorbed particles.This is crucial for accurately assessing insulator safety and informing critical decision-making.Although previous research has demonstrated that particle arrangement significantly influences the electric field distribution around transmission lines,an in-depth analysis of its effects on insulator surfaces remains lacking.To address this gap,this study establishes a composite insulator model to examine how three types of spherical contamination layers affect the electric field distribution on insulator surfaces under varying environmental conditions.The results reveal that in dry environments,the electric field strength at the apex of single-particle contamination layers increases with the particle size and relative permittivity.For the double-particle contamination layers,the electric field intensity on the insulator surface decreases as the particle spacing increases,and larger particles are more likely to attract smaller charged particles.For triple-particle contamination layers arranged in a triangular pattern,the maximum surface field strength is nearly double that of the chain-arranged particles.Furthermore,within the chain-arranged triple-particle contamination layers,a large-small-large size arrangement has a more pronounced impact on the surface electric field than a small-large-small size arrangement.In humid environments,the surface electric field strength of insulators decreases with increasing contamination levels.These findings are of significant theoretical and practical importance for ensuring the safe operation of power systems. 展开更多
关键词 composite insulator electric field distribution contamination humid environment arrangement pattern
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Exciton insulators in two-dimensional systems 认领 引用
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作者 Huaiyuan Yang Xi Dai Xin-Zheng Li 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第9期496-505,共10页
Electron-hole interactions play a crucial role in determining the optoelectronic properties of materials,and in lowdimensional systems this is especially true due to the decrease of screening.In this review,we focus o... Electron-hole interactions play a crucial role in determining the optoelectronic properties of materials,and in lowdimensional systems this is especially true due to the decrease of screening.In this review,we focus on one unique quantum phase induced by the electron-hole interaction in two-dimensional systems,known as“exciton insulators”(EIs).Although this phase of matter has been studied for more than half a century,suitable platforms for its stable realization remain scarce.We provide an overview of the strategies to realize EIs in accessible materials and structures,along with a discussion on some unique properties of EIs stemming from the band structures of these materials.Additionally,signatures in experiments to distinguish EIs are discussed. 展开更多
关键词 excitonic insulator two-dimensional materials
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Random flux manipulating topological phase transitions in Chern insulators 认领 引用
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作者 Jinkun Wang Wu-Ming Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第6期493-503,共11页
We investigate the localization and topological properties of the Haldane model under the influence of random flux and Anderson disorder. Our localization analysis reveals that random flux induces a transition from in... We investigate the localization and topological properties of the Haldane model under the influence of random flux and Anderson disorder. Our localization analysis reveals that random flux induces a transition from insulating to metallic states, while Anderson localization only arises under the modulation of Anderson disorder. By employing real-space topological invariant methods, we demonstrates that the system undergoes topological phase transitions under different disorder manipulations, whereas random flux modulation uniquely induces topological Anderson insulator phases, with the potential to generate states with opposite Chern numbers. These findings highlight the distinct roles of disorder in shaping the interplay between topology and localization, providing insights into stabilizing topological states and designing robust topological quantum materials. 展开更多
关键词 topological phase transitions disorder system Chern insulator
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Higher-Order Topological Insulators with Fractional Charges Modulated by Lorentz Transformation 认领 引用
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作者 Yuwei Hu Suge Feng +6 位作者 Boquan Ren Hua Zhong Milivoj R.Belic Meng Cao Yongdong Li Tao Wang Yiqi Zhang 《Journal of Beijing Institute of Technology》 EI CAS 2025年第2期165-174,共10页
Topological insulators represent a new phase of matter,characterized by conductive surfaces,while their bulk remains insulating.When the dimension of the system exceeds that of the topological state by at least two,th... Topological insulators represent a new phase of matter,characterized by conductive surfaces,while their bulk remains insulating.When the dimension of the system exceeds that of the topological state by at least two,the insulators are classified as higher-order topological insulators(HOTI).The appearance of higher-order topological states,such as corner states,can be explained by the filling anomaly,which leads to the fractional spectral charges in the unit cell.Previously reported fractional charges have been quite limited in number and size.In this work,based on the two-dimensional(2D)Su-Schrieffer-Heeger model lattice,we demonstrated a new class of HOTIs with adjustable fractional charges that can take any value ranging from 0 to 1,achieved by utilizing the Lorentz transformation.Furthermore,this transformation generates novel bound-state-in-continuum-like corner states,even when the lattice is in a topological trivial phase,offering a new approach to light beam localization.This work paves the way for fabricating HOTIs with diverse corner states that offer promising applicative potential. 展开更多
关键词 topological insulator corner state spectral charge Lorentz transformation
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First-principles design of excitonic insulators:A review 认领 引用
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作者 Hongwei Qu Haitao Liu Yuanchang Li 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第9期434-443,共10页
The excitonic insulator(EI)is a more than 60-year-old theoretical proposal that is still elusive.It is a purely quantum phenomenon involving the spontaneous generation of excitons in quantum mechanics and the spontane... The excitonic insulator(EI)is a more than 60-year-old theoretical proposal that is still elusive.It is a purely quantum phenomenon involving the spontaneous generation of excitons in quantum mechanics and the spontaneous condensation of excitons in quantum statistics.At this point,the excitons represent the ground state rather than the conventional excited state.Thus,the scarcity of candidate materials is a key factor contributing to the lack of recognized EI to date.In this review,we begin with the birth of EI,presenting the current state of the field and the main challenges it faces.We then focus on recent advances in the discovery and design of EIs based on the first-principles Bethe-Salpeter scheme,in particular the dark-exciton rule guided screening of materials.It not only opens up new avenues for realizing excitonic instability in direct-gap and wide-gap semiconductors,but also leads to the discovery of novel quantum states of matter such as half-EIs and spin-triplet EIs.Finally,we will look ahead to possible research pathways leading to the first recognized EI,both theoretically and computationally. 展开更多
关键词 excitonic insulator Bose condensation rst-principles Bethe-Salpeter equation(BSE)
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Interaction enhanced inter-site hoppings for holons and interlayer exciton insulators in moiré correlated insulators 认领 引用
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作者 Zijian Ma Hongyi Yu 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第9期519-525,共7页
In moiré-patterned van der Waals structures of transition metal dichalcogenides,correlated insulators can form under integer and fractional fillings,whose transport properties are governed by various quasiparticl... In moiré-patterned van der Waals structures of transition metal dichalcogenides,correlated insulators can form under integer and fractional fillings,whose transport properties are governed by various quasiparticle excitations including holons,doublons and interlayer exciton insulators.Here we theoretically investigate the nearest-neighbor inter-site hoppings of holons and interlayer exciton insulators.Our analysis indicates that these hopping strengths are significantly enhanced compared to that of a single carrier.The underlying mechanism can be attributed to the strong Coulomb interaction between carriers at different sites.For the interlayer exciton insulator consisting of a holon and a carrier in different layers,we have also obtained its effective Bohr radius and energy splitting between the ground and the first-excited states. 展开更多
关键词 correlated insulator holon interlayer exciton insulator moirépattern
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Role of symmetry in antiferromagnetic topological insulators 认领 引用
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作者 Sahar Ghasemi Morad Ebrahimkhas 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第7期534-540,共7页
In this investigation,we delve into the interplay between strong interactions and intricate topological configurations,leading to emergent quantum states such as magnetic topological insulators.The crux of our researc... In this investigation,we delve into the interplay between strong interactions and intricate topological configurations,leading to emergent quantum states such as magnetic topological insulators.The crux of our research centers on elucidating how lattice symmetry modulates antiferromagnetic quantum Hall phenomena.Utilizing the spinful Harper-Hofstadter model enriched with a next-nearest-neighbor(NNN)hopping term,we discern a half-filling bandgap,paving the way for the manifestation of a quantum Hall insulator characterized by a Chern number,C=2.Upon integrating a checkerboardpatterned staggered potential(△)and the Hubbard interaction(U),the system exhibits complex dynamical behaviors.Marginal NNN hopping culminates in a Ne′el antiferromagnetic Mott insulator.In contrast,intensified hopping results in stripe antiferromagnetic configurations.Moreover,in the regime of limited NNN hopping,a C=1 Ne′el antiferromagnetic quantum Hall insulator emerges.A salient observation pertains to the manifestation of a C=1 antiferromagnetic quantum Hall insulator when spin-flip mechanisms are not offset by space group symmetries.These findings chart a pathway for further explorations into antiferromagnetic Quantum Hall States. 展开更多
关键词 antiferromagnetic quantum hall insulator topological phase transitions Harper-Hofstadter-Hubbard model lattice symmetry effects
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Second-Order Topological Insulators in 2D Electronic Materials 认领 引用
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作者 FENG Xiao-ran NIU Cheng-wang +1 位作者 HUANG Bai-biao DAI Ying 《物理学进展》 北大核心 2025年第1期1-31,共31页
Higher-order band topology not only enriches our understanding of topological phases but also unveils pioneering lower-dimensional boundary states,which harbors substantial potential for next-generation device applica... Higher-order band topology not only enriches our understanding of topological phases but also unveils pioneering lower-dimensional boundary states,which harbors substantial potential for next-generation device applications.The distinct electronic configurations and tunable attributes of two-dimensional materials position them as a quintessential platform for the realization of second-order topological insulators(SOTIs).This article provides an overview of the research progress in SOTIs within the field of two-dimensional electronic materials,focusing on the characterization of higher-order topological properties and the numerous candidate materials proposed in theoretical studies.These endeavors not only enhance our understanding of higher-order topological states but also highlight potential material systems that could be experimentally realized. 展开更多
关键词 second order topological insulator corner state 2D electronic material
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Fiber Bragg grating monitors for thermal and stress of the composite insulators in transmission lines 认领 引用 被引量：6
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作者 Heming Deng Wei Cai +3 位作者 You Song Jinsong Liu Christopher Redman Qiandong Zhuang 《Global Energy Interconnection》 2018年第3期382-390,共9页
Running composite insulators are prone to failure due to their harsh surrounding work environment, which directly affects the safe operation of transmission lines. This paper puts forward the method of using fiber Bra... Running composite insulators are prone to failure due to their harsh surrounding work environment, which directly affects the safe operation of transmission lines. This paper puts forward the method of using fiber Bragg grating(FBG) as the monitors to parameters correlated with thermal and stress of the composite insulators in transmission lines at working status. Firstly, monitoring points are found out by the mechanical test on composite insulator samples. Secondly, based on the monitoring theory, this paper introduces the feasibility design frame of the composite insulator with FBG implanted in the rod and the online monitor system. At last, it describes applications of this monitor system in the field of transmission lines. 展开更多
关键词 Thermal monitoring Stress monitoring Composite insulators Transmission lines Fiber Bragg grating monitors
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Topological Insulators on the Ruby Lattice with Rashba Spin-Orbit Coupling 认领 引用 被引量：1
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作者 HOU Jing-Min WANG Guo-Xiang 《Communications in Theoretical Physics》 SCIE CAS CSCD 2013年第7期129-135,共7页
We investigate a tight-binding model of the ruby lattice with Rashba spin-orbit coupling.We calculate the band structure of the lattice and evaluate the Z2 topological indices.According to the Z2 topological indices a... We investigate a tight-binding model of the ruby lattice with Rashba spin-orbit coupling.We calculate the band structure of the lattice and evaluate the Z2 topological indices.According to the Z2 topological indices and the band structure,we present the phase diagrams of the lattice with different filling fractions.We findthat topological insulators occur in some range of parameters at 1/6,1/3,1/2,2/3 and 5/6 filling fractions.We analyze and discuss the characteristics of these topological insulators and their edge states. 展开更多
关键词 topological insulators ruby lattice rashba spin-coupling
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Observation of Topological Links Associated with Hopf Insulators in a Solid-State Quantum Simulator 认领 引用 被引量：1
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作者 袁新星 何丽 +8 位作者 王胜涛 邓东灵 王飞 连文倩 王歆 张楚珩 张慧丽 常秀英 段路明 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第6期14-18,共5页
Hopf insulators are intriguing three-dimensional topological insulators characterized by an integer topological invariant. They originate from the mathematical theory of Hopf fibration and epitomize the deep connectio... Hopf insulators are intriguing three-dimensional topological insulators characterized by an integer topological invariant. They originate from the mathematical theory of Hopf fibration and epitomize the deep connection between knot theory and topological phases of matter, which distinguishes them from other classes of topological insulators. Here, we implement a model Hamiltonian for Hopf insulators in a solid-state quantum simulator and report the first experimental observation of their topological properties, including nontrivial topological links associated with the Hopf fibration and the integer-valued topological invariant obtained from a direct tomographic measurement. Our observation of topological links and Hopf fibration in a quantum simulator opens the door to probe rich topological properties of Hopf insulators in experiments. The quantum simulation and probing methods are also applicable to the study of other intricate three-dimensional topological model Hamiltonians. 展开更多
关键词 Observation of Topological Links Associated with Hopf Insulators in a Solid-State Quantum Simulator
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