Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals

Abstract

Valley-based electronics, known as valleytronics, is one of the keys to break through to a new stage of electronics. The valley degree of freedom is ubiquitous in the honeycomb lattice system. The honeycomb lattice structure of silicon called silicene is an fascinating playground of valleytronics. We investigate topological phases of silicene by introducing different exchange fields on the $A$ and $B$ sites. There emerges a rich variety of topologically protected states each of which has a characteristic spin-valley structure. The single Dirac-cone semimetal is such a state that one gap is closed while the other three gaps are open, evading the Nielsen-Ninomiya fermion-doubling problem. We have newly discovered a hybrid topological insulator named the quantum-spin-quantum-anomalous Hall insulator, where the quantum anomalous Hall effect occurs at one valley and the quantum spin Hall effect occurs at the other valley. Along its phase boundary, single-valley semimetals emerge, where only one of the two valleys is gapless with degenerated spins. These semimetals are also topologically protected because they appear in the interface of different topological insulators. Such a spin-valley dependent physics will be observed by optical absorption or edge modes.

6 pages, 4 figures (to be published in Phys. Rev. B)

References in corpus (25)

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• Quantum Spin Hall Effect in Silicene
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• Valley filter and valley valve in graphene
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Cited by in corpus (97)

• Topological Phases in Two-Dimensional Materials: A Brief Review
• Quantum anomalous Hall effect and related topological electronic states
• Colloquium: Quantum anomalous Hall effect
• Monolayer Topological Insulators: Silicene, Germanene and Stanene
• Large valley splitting in monolayer WS${}_2$ by proximity coupling to an insulating antiferromagnetic substrate
• Liganded Xene as a Prototype of Two-Dimensional Stiefel-Whitney Insulators
• Emergence of ferroelectricity and spin-valley properties in two-dimensional honeycomb binary compounds
• Topological Kirchhoff Law and Bulk-Edge Correspondence for Valley-Chern and Spin-Valley-Chern Numbers
• Quantized Conductance and Field-Effect Topological Quantum Transistor in Silicene Nanoribbons
• Isolation and Characterization of Few-layer Manganese Thiophosphite
• Topological Properties of Electrons in Honeycomb Lattice with Kekulé Hopping Textures
• Lattice symmetry assisted second order topological superconductors and Majorana patterns
• Discovering new two-dimensional topological insulators from computational screening
• Interference of Topologically Protected Edge States in Silicene Nanoribbons
• Topological Phase Transition without Gap Closing
• Charge transport in pn and npn junctions of silicene
• Quantum anomalous Hall effect in atomic crystal layers from in-plane magnetization
• Is Silicene the Next Graphene?
• Conductance, Valley and Spin polarization and Tunnelling magneto-resistance in ferromagnetic-normal-ferromagnetic junctions of silicene
• Valley-polarized magnetoconductivity and particle-hole symmetry breaking in a periodically modulated $\alpha$-${\mathcal{T}}_3$ lattice
• Electrically Tunable Topological State in [111] Perovskite Materials with Antiferromagnetic Exchange Field
• Investigation of Electron-Phonon Coupling in Epitaxial Silicene by In-situ Raman Spectroscopy
• Atomically Thin Quantum Spin Hall Insulators
• Interaction Induced Quantum Valley Hall Effect in Graphene
• Chern insulator in a hyperbolic lattice
• Giant Spin-valley Polarization and Multiple Hall Effect in Functionalized Bi Monolayers
• Designing substrates for silicene and germanene: First-principles calculations
• Electrically Tunable Conductance and Edge Modes in Topological Crystalline Insulator Thin Films: Tight-Binding Model Analysis
• Quantum Spin-quantum Anomalous Hall Effect with Tunable Edge States in Sb Monolayer-based Heterostructures
• Electric field controlled spin- and valley-polarized edge states in silicene with extrinsic Rashba effect
• Valleytronics on the Surface of Topological Crystalline Insulator: Elliptic Dichroism and Valley-Selective Optical Pumping
• Antiferromagnetic Topological Superconductor and Electrically Controllable Majorana Fermions
• Optical orientation with linearly polarized light in transition metal dichalcogenides
• Spin and valley transports in junctions of Dirac fermions
• In-Plane Magnetization Induced Quantum Anomalous Hall Effect in Atomic Crystals of Group-V Elements
• Electrical control of crossed Andreev reflection and spin-valley switch in antiferromagnet/superconductor junctions
• Symmetry Protected Topological Charge in Symmetry Broken Phase: Spin-Chern, Spin-Valley-Chern and Mirror-Chern Numbers
• Optically reconfigurable quantum spin-valley Hall effect of light in coupled nonlinear ring resonator lattice
• Edge States in Silicene Nanodisks
• Efficient Dual Spin-Valley Filter In Strained Silicene
• Effective Interactions in a Graphene Layer Induced by the Proximity to a Ferromagnet
• Spin-valley polarized edge states and quantum anomalous Hall states controlled by side potential in 2D honeycomb lattices
• Quantum-electrodynamical approach to the exciton spectrum in Transition-Metal Dichalcogenides
• Topological Anderson Insulators in Systems without Time-Reversal Symmetry
• Perfect valley filter based on topological phase in disordered $\mathrm{Sb}$ Monolayer Heterostructure
• Quantum Hall Effects with High Spin-Chern Numbers in Buckled Honeycomb Structure with Magnetic Order
• Thermal conductance by Dirac fermions in a normal-insulator-superconductor junction of silicene
• Quantum charge pumping through resonant crossed Andreev reflection in superconducting hybrid junction of Silicene
• Electrical Transport Model of Silicene as a Channel of Field Effect Transistor
• Quantum Valley Hall effect without Berry curvature
• Plasmon-phonon coupling in a valley-spin-polarized two-dimensional electron system: a theoretical study on monolayer silicene
• Electron spin dynamics of two-dimensional layered materials
• Electric conductivity in graphene: Kubo model versus a nonlocal quantum field theory model
• Collective plasmonic excitations in double-layer silicene at finite temperature
• Probing topological phases in a perturbed Kane-Mele model via RKKY interaction: Application to monolayer jacutingaite Pt${}_2$HgSe${}_3$
• Zigzag nanoribbons of two-dimensional hexagonal crystals: magnetic, topological and thermoelectric properties
• Topological edge states of a graphene zigzag nanoribbon with spontaneous edge magnetism
• Proximity induced spin-valley polarization in silicene/germanene on F-doped WS${}_2$
• Interaction-induced quantum spin Hall insulator in the organic Dirac electron system $\alpha$-(BEDT-TSeF)${}_2$I${}_3$
• Optimizing Topological Switching in Confined 2D-Xene Nanoribbons via Finite-Size Effects
• Transport through graphene-like flakes with intrinsic spin orbit interactions
• 2D Ladder polyborane: an ideal Dirac semimetal with a multi-feld-tunable band gap
• Magnetic oscillations in silicene
• Point defect formation energies in graphene from diffusion quantum Monte Carlo and density functional theory
• Spin- and valley-dependent Goos-Hanchen effect in silicene and gapped graphene structures
• Anisotropic Friedel oscillations in graphene-like materials: The Dirac point approximation in wave-number dependent quantities revisited
• Photoenhanced spin/valley polarization and tunneling magnetoresistance in ferromagnetic-normal-ferromagnetic silicene junction
• Spontaneous breaking of time-reversal symmetry at the edges of 1T' monolayer transition metal dichalcogenides
• The role of spin-orbit coupling in topologically protected interface states in Dirac materials
• Single Dirac-Cone State and Quantum Hall Effects in Honeycomb Structure
• Effect of an external electric field on local magnetic moments in silicene
• Altermagnetism Induced Topological Phase Transitions in Kane-Mele Model
• Relaxation times and charge conductivity of silicene
• Strain control of real-and lattice-spin currents in a silicene junction
• Lattice-pseudospin and spin-valley polarizations in dual ferromagnetic-gated silicene junction
• Two Classes of Singularities and Novel Topology in a Specially Designed Synthetic Photonic Crystals
• Spin splitting and spin Hall conductivity in buckled monolayers of the group 14: First-principles calculations
• Signatures of interfacial topological chiral modes via RKKY exchange interaction in Dirac and Weyl systems
• Two-dimensional Weyl nodal-line semimetal and antihelical edge states in a modified Kane-Mele model
• Topological Phase Transition Coupled with Spin-Valley Physics in Ferroelectric Oxide Heterostructures
• Simulating graphene dynamics in one-dimensional modulated ring array with synthetic dimension
• Tunneling valley Hall effect induced by coherent geometric phase
• Protected edge states in silicene antidots and dots in magnetic field
• Quantum valley Hall states in low-buckled counterparts of graphene bilayer
• Switching modulation of spin transport in ferromagnetic tetragonal silicene
• Nearly pure spin-valley sideband tunneling in silicene: effect of interplay of time periodic potential barrier and spin-valley-dependent Dirac mass
• Robust propagating in-gap modes due to spin-orbit domain walls in graphene
• Quantum Anomalous Hall Effect in a Perovskite and Inverse-Perovskite Sandwich Structure
• Control of valley optical conductivity and topological phases in buckled hexagonal lattice by orientation of in-plane magnetic field
• Spin-valley-coupled quantum spin Hall insulator with topological Rashba-splitting edge states in Janus monolayer $\mathrm{CS}{\mathrm{b}}_{1.5}\mathrm{B}{\mathrm{i}}_{1.5}$
• Dynamical spin-spin susceptibility of Silicene
• Photonic emulation of two-dimensional materials with antiferromagnetic order
• Zigzag nanoribbon of gated bilayer hexagonal crystals with spontaneous edge magnetism
• Valley Gapless Semiconductor: Models and Applications
• Topological spin-up triplet excitonic condensation in two-dimensional electron-hole systems
• The perfect spin injection in silicene FS/NS junction
• Intrinsic Valley-Related Multiple Hall Effect in 2D Organometallic Lattice