期刊文献+
共找到46篇文章
< 1 2 3 >
每页显示 20 50 100
Interacting topological magnons in a checkerboard ferromagnet
1
作者 朱恒 施洪潮 +1 位作者 唐政国 唐炳 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期596-601,共6页
This work is devoted to studying the magnon-magnon interaction effect in a two-dimensional checkerboard ferromagnet with the Dzyaloshinskii-Moriya interaction.Using a first-order Green function method,we analyze the i... This work is devoted to studying the magnon-magnon interaction effect in a two-dimensional checkerboard ferromagnet with the Dzyaloshinskii-Moriya interaction.Using a first-order Green function method,we analyze the influence of magnon-magnon interaction on the magnon band topology.We find that Chern numbers of two renormalized magnon bands are different above and below the critical temperature,which means that the magnon band gap-closing phenomenon is an indicator for one topological phase transition of the checkerboard ferromagnet.Our results show that the checkerboard ferromagnet possesses two topological phases,and its topological phase can be controlled either via the temperature or the applied magnetic field due to magnon-magnon interactions.Interestingly,it is found that the topological phase transition can occur twice with the increase in the temperature,which is different from the results of the honeycomb ferromagnet. 展开更多
关键词 topological magnons magnon-magnon interactions topological phase transitions checkerboard ferromagnets
下载PDF
Topological edge and corner states of valley photonic crystals with zipper-like boundary conditions
2
作者 沈云峰 许孝芳 +2 位作者 孙铭 周文佶 常雅箐 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期480-491,共12页
We present a stable valley photonic crystal(VPC)unit cell with C_(3v)symmetric quasi-ring-shaped dielectric columns and realize its topological phase transition by breaking mirror symmetry.Based on this unit cell stru... We present a stable valley photonic crystal(VPC)unit cell with C_(3v)symmetric quasi-ring-shaped dielectric columns and realize its topological phase transition by breaking mirror symmetry.Based on this unit cell structure,topological edge states(TESs)and topological corner states(TCSs)are realized.We obtain a new type of wave transmission mode based on photonic crystal zipper-like boundaries and apply it to a beam splitter assembled from rectangular photonic crystals(PCs).The constructed beam splitter structure is compact and possesses frequency separation functions.In addition,we construct a box-shaped triangular PC structures with zipper-like boundaries and discover phenomena of TCSs in the corners,comparing its corner states with those formed by other boundaries.Based on this,we explore the regularities of the electric field patterns of TESs and TCSs,explain the connection between the characteristic frequencies and locality of TCSs,which helps better control photons and ensures low power consumption of the system. 展开更多
关键词 valley photonic crystal topological edge states topological corner states higher-order topological insulators topological phase transition
下载PDF
New approach to measuring topological phase transitions utilizing Floquet technology
3
作者 Xue-Ying Yang Wei Wu Ping-Xing Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第9期282-288,共7页
The Floquet technique provides a novel anomalous topological phase for non-equilibrium phase transitions.Based on the high symmetry of the quantum anomalous Hall model,the findings suggest a one-to-one correspondence ... The Floquet technique provides a novel anomalous topological phase for non-equilibrium phase transitions.Based on the high symmetry of the quantum anomalous Hall model,the findings suggest a one-to-one correspondence between the average spin texture and the Floquet quasi-energy spectrum.A new approach is proposed to directly measure the quasienergy spectrum,replacing previous measurements of the average spin texture.Finally,we proposed a reliable experimental scheme based on ion trap platforms.This scheme markedly reduces the measurement workload,improves the measurement fidelity,and is applicable to multiple platforms such as cold atoms and nuclear magnetic resonance. 展开更多
关键词 topological phase transition Floquet technique ion trap
下载PDF
Two-dimensional Sb net generated nontrivial topological states in SmAgSb_(2) probed by quantum oscillations
4
作者 袁健 石贤彪 +7 位作者 杜红 李田 郗传英 王霞 夏威 王保田 钟瑞丹 郭艳峰 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第7期51-58,共8页
The REAgSb_(2)(RE = rare earth and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We... The REAgSb_(2)(RE = rare earth and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We report herein the magnetization and magnetotransport measurements of SmAgSb_(2) single crystal, which unveil very large magnetoresistance and high carrier mobility up to 6.2 × 10^(3)% and 5.58 × 10^(3)cm^(2)·V^(-1)·s^(-1), respectively. The analysis of both Shubnikov–de Haas and de Haas–van Alphen quantum oscillations indicates nontrivial Berry phases in the paramagnetic state while trivial Berry curvature in the antiferromagnetic state, indicating a topological phase transition induced by the antiferromagnetic order. It is also supported by the first-principles calculations. The results not only provide a new interesting topological material but also offer valuable insights into the correlation between magnetism and nontrivial topological states. 展开更多
关键词 large magnetoresistance quantum oscillations topological phase transition
下载PDF
Topological phase transition in compressed van der Waals superlattice heterostructure BiTeCl/HfTe_(2)
5
作者 李志磊 李殷翔 +2 位作者 王奕婷 陈文执 陈斌 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第8期437-442,共6页
Based on first-principles calculations,we investigate the electronic band structures and topological properties of heterostructure BiTeCl/HfTe_(2) under c-direction strain.In the primitive structure,this material unde... Based on first-principles calculations,we investigate the electronic band structures and topological properties of heterostructure BiTeCl/HfTe_(2) under c-direction strain.In the primitive structure,this material undergoes a phase transition from an insulator with a narrow indirect gap to a metal by strong spin-orbital coupling.When strain effect is considered,band inversion at time-reversal invariant point Z is responsible for the topological phase transition.These nontrivial topologies are caused by two different types of band crossings.The observable topological surface states in(110)surface also support that this material experiences topological phase transition twice.The layered heterostructure with van der Waals force provides us with a new desirable platform upon which to control topological phase transition and construct topological superconductors. 展开更多
关键词 topological phase transition surface states strain effect HETEROSTRUCTURE
下载PDF
Emergent topological ordered phase for the Ising-XY model revealed by cluster-updating Monte Carlo method
6
作者 马赫阳 张万舟 +2 位作者 田彦婷 丁成祥 邓友金 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期386-400,共15页
The two-component cold atom systems with anisotropic hopping amplitudes can be phenomenologically described by a two-dimensional Ising-XY coupled model with spatial anisotropy.At low temperatures,theoretical predictio... The two-component cold atom systems with anisotropic hopping amplitudes can be phenomenologically described by a two-dimensional Ising-XY coupled model with spatial anisotropy.At low temperatures,theoretical predictions[Phys.Rev.A 72053604(2005)]and[arXiv:0706.1609]indicate the existence of a topological ordered phase characterized by Ising and XY disorder but with 2XY ordering.However,due to ergodic difficulties faced by Monte Carlo methods at low temperatures,this topological phase has not been numerically explored.We propose a linear cluster updating Monte Carlo method,which flips spins without rejection in the anisotropy limit but does not change the energy.Using this scheme and conventional Monte Carlo methods,we succeed in revealing the nature of topological phases with half-vortices and domain walls.In the constructed global phase diagram,Ising and XY-type transitions are very close to each other and differ significantly from the schematic phase diagram reported earlier.We also propose and explore a wide range of quantities,including magnetism,superfluidity,specific heat,susceptibility,and even percolation susceptibility,and obtain consistent and reliable results.Furthermore,we observed first-order transitions characterized by common intersection points in magnetizations for different system sizes,as opposed to the conventional phase transition where Binder cumulants of various sizes share common intersections.The critical exponents of different types of phase transitions are reasonably fitted.The results are useful to help cold atom experiments explore the half-vortex topological phase. 展开更多
关键词 topological phase transition Ising-XY model Monte Carlo method half vortex
下载PDF
Topological properties of tetratomic Su-Schrieffer-Heeger chains with hierarchical long-range hopping
7
作者 李冠强 王博涵 +2 位作者 唐劲羽 彭娉 董亮伟 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第7期469-476,共8页
We propose a new generalized Su–Schrieffer–Heeger model with hierarchical long-range hopping based on a onedimensional tetratomic chain. The properties of the topological states and phase transition, which depend on... We propose a new generalized Su–Schrieffer–Heeger model with hierarchical long-range hopping based on a onedimensional tetratomic chain. The properties of the topological states and phase transition, which depend on the cointeraction of the intracell and intercell hoppings, are investigated using the phase diagram of the winding number. It is shown that topological states with large positive/negative winding numbers can readily be generated in this system. The properties of the topological states can be verified by the ring-type structures in the trajectory diagram of the complex plane. The topological phase transition is strongly related to the opening(closure) of an energy bandgap at the center(boundaries) of the Brillouin zone. Finally, the non-zero-energy edge states at the ends of the finite system are revealed and matched with the bulk–boundary correspondence. 展开更多
关键词 generalized Su-Schrieffer-Heeger model tight-binding approximation topological phase transition long-range hopping winding number edge state
下载PDF
Spin direction dependent quantum anomalous Hall effect in two-dimensional ferromagnetic materials
8
作者 杨宇贤 张昌文 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第4期613-621,共9页
We propose a scheme for realizing the spin direction-dependent quantum anomalous Hall effect(QAHE)driven by spin-orbit couplings(SOC)in two-dimensional(2D)materials.Based on the sp^(3)tight-binding(TB)model,we find th... We propose a scheme for realizing the spin direction-dependent quantum anomalous Hall effect(QAHE)driven by spin-orbit couplings(SOC)in two-dimensional(2D)materials.Based on the sp^(3)tight-binding(TB)model,we find that these systems can exhibit a QAHE with out-of-plane and in-plane magnetization for the weak and strong SOC,respectively,in which the mechanism of quantum transition is mainly driven by the band inversion of p_(x,y)/p_(z)orbitals.As a concrete example,based on first-principles calculations,we realize a real material of monolayer 1T-SnN_(2)/PbN_(2)exhibiting the QAHE with in-plane/out-of-plane magnetization characterized by the nonzero Chern number C and topological edge states.These findings provide useful guidance for the pursuit of a spin direction-dependent QAHE and hence stimulate immediate experimental interest. 展开更多
关键词 topological phase transition quantum anomalous Hall effect first-principles calculations
下载PDF
Floquet bands and photon-induced topological edge states of graphene nanoribbons 被引量:1
9
作者 Weijie Wang Xiaolong Lü Hang Xie 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第6期449-456,共8页
Floquet theorem is widely used in the light-driven systems. But many 2 D-materials models under the radiation are investigated with the high-frequency approximation, which may not be suitable for the practical experim... Floquet theorem is widely used in the light-driven systems. But many 2 D-materials models under the radiation are investigated with the high-frequency approximation, which may not be suitable for the practical experiment. In this work,we employ the non-perturbative Floquet method to strictly investigate the photo-induced topological phase transitions and edge states properties of graphene nanoribbons under the light irradiation of different frequencies(including both low and high frequencies). By analyzing the Floquet energy bands of ribbon and bulk graphene, we find the cause of the phase transitions and its relation with edge states. Besides, we also find the size effect of the graphene nanoribbon on the band gap and edge states in the presence of the light. 展开更多
关键词 Floquet bands GRAPHENE topological phase transition edge states
下载PDF
Topological phase transitions driven by next-nearest-neighbor hopping in noncentrosymmetric cold Fermi gases 被引量:1
10
作者 王瑞 张存喜 计青山 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第3期66-71,共6页
We investigate the topological phase marked by the Thouless–Kohmoto–Nightingale–Nijs(TKNN) number and the phase transitions driven by the next nearest neighbor(NNN) hopping in noncentrosymmetric cold Fermi gase... We investigate the topological phase marked by the Thouless–Kohmoto–Nightingale–Nijs(TKNN) number and the phase transitions driven by the next nearest neighbor(NNN) hopping in noncentrosymmetric cold Fermi gases, both spinsinglet pairing and spin-triplet pairing are considered. There exists a critical t'c for the NNN hopping, at which the quantum phase transition occurs, and the system changes from an Abelian(non-Abelian) phase to a non-Abelian(Abelian) one. By numerically diagonalizing the Hamiltonian in the real space, the energy spectra with edge states for different topological phases and the Majorana zero modes are discussed. Although the spin-triplet pairing does not contribute to the gap closing and the phase diagram, it induces gapless states in the presence of a magnetic field, and the TKNN number in this region is still zero. 展开更多
关键词 topological phase transition Fermi gases Majorana fermion
下载PDF
Topological Transition in Monolayer Blue Phosphorene with Transition-Metal Adatom under Strain
11
作者 Ge Hu Jun Hu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2020年第4期443-449,I0001,共8页
We carried out first-principles calculations to investigate the electronic properties of the monolayer blue phosphorene(BlueP)decorated by the group-IVB transition-metal adatoms(Cr,Mo and W),and found that the Cr-deco... We carried out first-principles calculations to investigate the electronic properties of the monolayer blue phosphorene(BlueP)decorated by the group-IVB transition-metal adatoms(Cr,Mo and W),and found that the Cr-decorated BlueP is a magnetic half metal,while the Mo-and W-decorated BlueP are semiconductors with band gaps smaller than 0.2 eV.Compressive biaxial strains make the band gaps close and reopen,and band inversions occur during this process,which induces topological transitions in the Mo-decorated BlueP(with strain of-5.75%)and W-decorated BlueP(with strain of-4.25%)from normal insulators to topological insulators(TIs).The TI gap is 94 meV for the Mo-decorated BlueP and218 me V for the W-decorated BlueP.Such large TI gaps demonstrate the possibility to engineer topological phases in the monolayer BlueP with transition-metal adatoms at high temperature. 展开更多
关键词 topological transition Monolayer Blue phosphorene Biaxial strain Transition-metal adatom
下载PDF
Erratum to“Floquet bands and photon-induced topological edge states of graphene nanoribbons”
12
作者 Weijie Wang Xiaolong Lü Hang Xie 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期685-685,共1页
Figures 2(a)and 2(b)in our original paper[1] should be corrected by the following ones.In Figs.2(a)and 2(b),in the region of hω0>5.96γ0(phase A),the Chern number should be corrected to 1,as indicated in the paper... Figures 2(a)and 2(b)in our original paper[1] should be corrected by the following ones.In Figs.2(a)and 2(b),in the region of hω0>5.96γ0(phase A),the Chern number should be corrected to 1,as indicated in the paper and Table 1. 展开更多
关键词 Floquet bands GRAPHENE topological phase transition edge states
下载PDF
Topological phase transition in cavity optomechanical system with periodical modulation
13
作者 Zhi-Xu Zhang Lu Qi +2 位作者 Wen-Xue Cui Shou Zhang Hong-Fu Wang 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第7期104-111,共8页
We investigate the topological phase transition and the enhanced topological effect in a cavity optomechanical system with periodical modulation.By calculating the steady-state equations of the system,the steady-state... We investigate the topological phase transition and the enhanced topological effect in a cavity optomechanical system with periodical modulation.By calculating the steady-state equations of the system,the steady-state conditions of cavity fields and the restricted conditions of effective optomechanical couplings are demonstrated.It is found that the cavity optomechanical system can be modulated to different topological Su–Schrieffer–Heeger(SSH)phases via designing the optomechanical couplings legitimately.Meanwhile,combining the effective optomechanical couplings and the probability distributions of gap states,we reveal the topological phase transition between trivial SSH phase and nontrivial SSH phase via adjusting the decay rates of cavity fields.Moreover,we find that the enhanced topological effect of gap states can be achieved by enlarging the size of system and adjusting the decay rates of cavity fields. 展开更多
关键词 topological phase transition periodical modulation enhanced topological effect
下载PDF
Photoinduced Weyl semimetal phase and anomalous Hall effect in a three-dimensional topological insulator
14
作者 Meng-Nan Chen Wen-Chao Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第11期94-101,共8页
Motivated by the fact that Weyl fermions can emerge in a three-dimensional topological insulator on breaking either time-reversal or inversion symmetries,we propose that a topological quantum phase transition to a Wey... Motivated by the fact that Weyl fermions can emerge in a three-dimensional topological insulator on breaking either time-reversal or inversion symmetries,we propose that a topological quantum phase transition to a Weyl semimetal phase occurs under the off-resonant circularly polarized light,in a three-dimensional topological insulator,when the intensity of the incident light exceeds a critical value.The circularly polarized light effectively generates a Zeeman exchange field and a renormalized Dirac mass,which are highly controllable.The phase transition can be exactly characterized by the first Chern number.A tunable anomalous Hall conductivity emerges,which is fully determined by the location of the Weyl nodes in momentum space,even in the doping regime.Our predictions are experimentally realizable through pump-probe angle-resolved photoemission spectroscopy and raise a new way for realizing Weyl semimetals and quantum anomalous Hall effects. 展开更多
关键词 Floquet theory Weyl semimetal topological phase transition Hall conductivity
下载PDF
Acoustic topological phase transition induced by band inversion of high-order compound modes and robust pseudospin-dependent transport
15
作者 Yan Li Yi-Nuo Liu Xia Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第10期411-417,共7页
A simple two-dimensional phononic crystal hosting topologically protected edge states is proposed to emulate the quantum spin Hall effect in electronic systems, whose phononic topological phase can be reconfigured thr... A simple two-dimensional phononic crystal hosting topologically protected edge states is proposed to emulate the quantum spin Hall effect in electronic systems, whose phononic topological phase can be reconfigured through the rotation of scatters. In particular, the band inversion occurs between two pairs of high-order compound states, resulting in topological phase transition from trivial to nontrivial over a relatively broad high-frequency range. This is further evidenced by an effective Hamiltonian derived by the k·p perturbation theory. The phononic topology is related to a pseudo-timereversal symmetry constructed by the point group symmetry of two doubly degenerate eigenstates. Numerical simulations unambiguously demonstrate robust helical edge states whose pseudospin indices are locked to the propagation direction along the interface between topologically trivial and nontrivial phononic crystals. Our designed phononic systems provide potential applications in robust acoustic signal transport along any desired path over a high-frequency range. 展开更多
关键词 topological phase transition band inversion compound mode PSEUDOSPIN
下载PDF
Characterization of topological phase of superlattices in superconducting circuits
16
作者 Jianfei Chen Chaohua Wu +1 位作者 Jingtao Fan Gang Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第8期688-694,共7页
The recent experimental observation of topological magnon insulator states in a superconducting circuit chain marks a breakthrough for topological physics with qubits, in which a dimerized qubit chain has been realize... The recent experimental observation of topological magnon insulator states in a superconducting circuit chain marks a breakthrough for topological physics with qubits, in which a dimerized qubit chain has been realized. Here, we extend such a dimer lattice to superlattice with arbitrary number of qubits in each unit cell in superconducting circuits, which exhibits rich topological properties. Specifically, by considering a quadrimeric superlattice, we show that the topological invariant(winding number) can be effectively characterized by the dynamics of the single-excitation quantum state through time-dependent quantities. Moreover, we explore the appearance and detection of the topological protected edge states in such a multiband qubit system. Finally, we also demonstrate the stable Bloch-like-oscillation of multiple interface states induced by the interference of them. Our proposal can be readily realized in experiment and may pave the way towards the investigation of topological quantum phases and topologically protected quantum information processing. 展开更多
关键词 superconducting circuits topological phase transition edge state interface state
下载PDF
Topological Lifshitz transition and novel edge states induced by non-Abelian SU(2)gauge field on bilayer honeycomb lattice
17
作者 Wen-Xiang Guo Wu-Ming Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第5期615-622,共8页
We investigate the SU(2)gauge effects on bilayer honeycomb lattice thoroughly.We discover a topological Lifshitz transition induced by the non-Abelian gauge potential.Topological Lifshitz transitions are determined by... We investigate the SU(2)gauge effects on bilayer honeycomb lattice thoroughly.We discover a topological Lifshitz transition induced by the non-Abelian gauge potential.Topological Lifshitz transitions are determined by topologies of Fermi surfaces in the momentum space.Fermi surface consists of N=8 Dirac points atπ-flux point instead of N=4 in the trivial Abelian regimes.A local winding number is defined to classify the universality class of the gapless excitations.We also obtain the phase diagram of gauge fluxes by solving the secular equation.Furthermore,the novel edge states of biased bilayer nanoribbon with gauge fluxes are also investigated. 展开更多
关键词 topological Lifshitz transition SU(2)gauge field bilayer honeycomb lattice
下载PDF
Topological phase transition in a ladder of the dimerized Kitaev superconductor chains
18
作者 周博臻 周斌 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第10期378-385,共8页
We investigate the topological properties of a ladder model of the dimerized Kitaev superconductor chains.The topological class of the system is determined by the relative phase θ between the inter-and intra-chain su... We investigate the topological properties of a ladder model of the dimerized Kitaev superconductor chains.The topological class of the system is determined by the relative phase θ between the inter-and intra-chain superconducting pairing.One topological class is the class BDI characterized by the Z index,and the other is the class D characterized by the Z;index.For the two different topological classes,the topological phase diagrams of the system are presented by calculating two different topological numbers,i.e.,the Z index winding number W and the Z;index Majorana number M,respectively.In the case of θ=0,the topological class belongs to the class BDI,multiple topological phase transitions accompanying the variation of the number of Majorana zero modes are observed.In the case of θ = π/2 it belongs to the class D.Our results show that for the given value of dimerization,the topologically nontrivial and trivial phases alternate with the variation of chemical potential. 展开更多
关键词 Majorana zero modes topological class topological phase transition
下载PDF
Topological phase diagrams and Majorana zero modes of the Kitaev ladder and tube
19
作者 Yiming Wang Zhidan Li Qiang Han 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第4期437-444,共8页
In this paper,we study two quasi-one-dimensional(1 D) Kitaev models with ladder-like and tube-like spatial structures,respectively.Our results provide the phase diagrams and explicit expressions of the Majorana zero... In this paper,we study two quasi-one-dimensional(1 D) Kitaev models with ladder-like and tube-like spatial structures,respectively.Our results provide the phase diagrams and explicit expressions of the Majorana zero modes.The topological phase diagrams are obtained by decomposing the topological invariants and the topological conditions for topologically nontrivial phases are given precisely.For systems which belongs to topological class BDI,we obtain the regions in the phase diagrams where the topological numbers show even-odd effect.For the Kitaev tube model a phase factor induced by the magnetic flux in the axial direction of the tube is introduced to alter the classification of the tube Hamiltonian from class BDI to D.The Kitaev tube of class D is characterized by the Z2 index when the number of chains is odd while 0,1,2 when the number of chains is even.The phase diagrams show periodic behaviors with respect to the magnetic flux.The bulk-boundary correspondence is demonstrated by the observations that the topological conditions for the bulk topological invariant to take nontrivial values are precisely those for the existence of the Majorana zero modes. 展开更多
关键词 topological phase transition Majorana zero modes Kitaev model
下载PDF
Atomic-Ordering-Induced Quantum Phase Transition between Topological Crystalline Insulator and Z_2 Topological Insulator
20
作者 Hui-Xiong Deng Zhi-Gang Song +2 位作者 Shu-Shen Li Su-Huai Wei Jun-Wei Luo 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期104-109,共6页
Topological phase transition in a single material usually refers to transitions between a trivial band insulator and a topological Dirac phase, and the transition may also occur between different classes of topologica... Topological phase transition in a single material usually refers to transitions between a trivial band insulator and a topological Dirac phase, and the transition may also occur between different classes of topological Dirac phases.It is a fundamental challenge to realize quantum transition between Z_2 nontrivial topological insulator(TI) and topological crystalline insulator(TCI) in one material because Z_2 TI and TCI have different requirements on the number of band inversions. The Z_2 TIs must have an odd number of band inversions over all the time-reversal invariant momenta, whereas the newly discovered TCIs, as a distinct class of the topological Dirac materials protected by the underlying crystalline symmetry, owns an even number of band inversions. Taking PbSnTe_2 alloy as an example, here we demonstrate that the atomic-ordering is an effective way to tune the symmetry of the alloy so that we can electrically switch between TCI phase and Z_2 TI phase in a single material. Our results suggest that the atomic-ordering provides a new platform towards the realization of reversibly switching between different topological phases to explore novel applications. 展开更多
关键词 Cu Te Sn TCI Atomic-Ordering-Induced Quantum Phase Transition between topological Crystalline Insulator and Z2 topological Insulator Pb Pt
下载PDF
上一页 1 2 3 下一页 到第
使用帮助 返回顶部