Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene

Abstract

Silicene (a monolayer of silicon atoms) is a topological insulator, which undergoes a topological phase transition to a band insulator under an external electric field. The spin polarization is unique and opposite at the K and K' points due to the spin-orbit coupling. Accordingly, silicene exhibits a strong circular dichroism with respect to optical absorption, obeying a certain spin-valley selection rule. It is remarkable that this selection rule is drastically different between these two types of insulators owing to a band inversion taking place at the phase transition point. Hence we can tell experimentally whether silicene is in the topological or band insulator phase by circular dichroism. Furthermore the selection rule enables us to excite electrons with definite spin and valley indices by optical absorption. Photo-induced current is spin polarized, where the spin direction is different between the topological and band insulators. It is useful for future spintronics applications.

4 pages, 7 figures

References in corpus (16)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• $Z_2$ Topological Order and the Quantum Spin Hall Effect
• Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides
• Two and one-dimensional honeycomb structures of silicon and germanium
• Quantum Spin Hall Effect in Silicene
• Valley contrasting physics in graphene: magnetic moment and topological transport
• Low-energy effective Hamiltonian involving spin-orbit coupling in Silicene and Two-Dimensional Germanium and Tin
• Electrically Tunable Band Gap in Silicene
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets
• Valley-Polarized Metals and Quantum Anomalous Hall Effect in Silicene
• Topological Insulator and Helical Zero Mode in Silicene under Inhomogeneous Electric Field
• Quantum Anomalous Hall Effect in Single-layer and Bilayer Graphene
• Quasi-Topological Insulator and Trigonal Warping in Gated Bilayer Silicene

Cited by in corpus (52)

• Colloquium: Topological Band Theory
• Photo-Induced Topological Phase Transition and a Single Dirac-Cone State in Silicene
• Topological Phases in Two-Dimensional Materials: A Brief Review
• Generation and Electric Control of Spin-Coupled Valley Current in WSe2
• Spin-Valleytronics in Silicene: Quantum-Spin-Quantum-Anomalous Hall Insulators and Single-Valley Semimetals
• Valley-Spin Polarization in the Magneto-Optical Response of Silicene and Other Similar 2D Crystals
• Magneto-Optical Conductivity of Silicene and Other Buckled Honeycomb Lattices
• Optical Signatures of the Tunable Band Gap and Valley-Spin Coupling in Silicene
• Quantized Conductance and Field-Effect Topological Quantum Transistor in Silicene Nanoribbons
• Current developments in silicene and germanene
• Dynamical Polarization Function, Plasmons and Screening in Silicene and Other Buckled Honeycomb Lattices
• AC/DC Spin and Valley Hall Effects in Silicene and Germanene
• Silicene Beyond Mono-layers - Different Stacking Configurations And Their Properties
• Casimir Force Phase Transitions in the Graphene Family
• Electrically Tunable Conductance and Edge Modes in Topological Crystalline Insulator Thin Films: Tight-Binding Model Analysis
• 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
• Detecting the Néel vector of altermagnet by attaching a topological insulator and crystalline valley-edge insulator
• H-Si bonding-induced unusual electronic properties of silicene: a method to identify hydrogen concentration
• Magneto-optical effects in the Landau level manifold of 2D lattices with spin-orbit interaction
• Realising Haldane's vision for a Chern insulator in buckled lattices
• Photonic spin Hall effect in Haldane model materials
• Spin-valley polarized edge states and quantum anomalous Hall states controlled by side potential in 2D honeycomb lattices
• Controlling plasmon modes and damping in buckled two-dimensional material open systems
• Phonon structure in dispersion curves and density of states of massive Dirac Fermions
• Hexagonally Warped Dirac Cones and Topological Phase Transition in Silicene Superstructure
• Zitterbewegung in monolayer silicene in a magnetic field
• Magnetic Properties of Dirac Fermions in a Buckled Honeycomb Lattice
• Optical Selection Rules in Spin-Orbit Coupled Systems on Honeycomb Lattice
• Electric conductivity in graphene: Kubo model versus a nonlocal quantum field theory model
• Probing topological phases in a perturbed Kane-Mele model via RKKY interaction: Application to monolayer jacutingaite Pt${}_2$HgSe${}_3$
• Floquet Spectrum and Two-Terminal Conductance of a Transition Metal Dichalcogenide Ribbon under a Circularly Polarized Laser Field
• Layer Control of Magneto-Optical Effects and Their Quantization in Spin-Valley Splitting Antiferromagnets
• Effects of parallel electric and magnetic fields on Rydberg excitons in buckled two-dimensional materials
• Ab initio Investigation on Hybrid Graphite-like Structure Made up of Silicene and Boron Nitride
• Relaxation times and charge conductivity of silicene
• Electronic transport and the related anomalous effects in silicene-like hexagonal lattice
• Theory of liquid film growth and wetting instabilities on graphene
• Quantum geometry and elliptic optical dichroism in $p$-wave magnets
• Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures
• Orbital magnetization senses the topological phase transition in a spin-orbit coupled $\alpha$-$T_3$ system
• Quantum geometry and $X$-wave magnets with $X=p,d,f,g,i$
• An effective model for the electronic and optical properties of stanene
• Tunable chirality and circular dichroism of a topological insulator with $C_{2v}$ symmetry as a function of Rashba and Dresselhaus parameters
• Photogalvanic Effect in Silicene
• Non-necessity of band inversion process in 2D topological insulators for bulk gapless states and topological phase transitions
• Anomalous Transition Magnetic Moments in two-dimensional Dirac Materials
• Detection of topological states in two-dimensional Dirac systems by the dynamic spin susceptibility
• Floquet engineering of spin-valley selective transport in jacutingaite
• Vanishing of interband light absorption in a persistent spin helix state
• Electric field tunable magnetoexcitons in Xenes-hBN-TMDC, Xenes-hBN-BP, and Xenes-hBN-TMTC heterostructures
• Floquet-Engineered Valley-Topotronics in Kekulé-Y Bond Textured Graphene Superlattice