Tight-binding model and ab initio calculation of silicene with strong spin-orbit coupling in low-energy limit

2018/04/05 by Chen-Huan Wu, Wu, Chen-Huan · 1 citation
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Quantum and electron transport phenomena #Topological Materials and Phenomena

paper · pdf · doi:10.48550/arxiv.1804.01695

openalex publication_date 2018/04/05 · openalex created_date 2018/04/13 · openalex updated_date 2026/07/28

Abstract

We carry out both the tight-binding model and the ab initio to study the layered silicene, the spin, valley, sublattice degrees of freedom are taken into consider and the effects of electric field, magnetic field, and even the light in finite frequency together with its interesting optical propertice, which are all closely related to the spin-orbit coupling and Rashba coupling and lead to the tunable phase transitions (between the nontrivial topological phase which has nonzero Chern number or nonzero spin Chern number and the trivial phase). An exotic quantum anomalous Hall insulator phase are found which has nonzero spin Chern number and nonzero valley Chern number and as a giant-application-potential spintronic and valleytronics in the two-ternimate devices based on the monolayer silicene for the information transmission. In fact, the gap-out action can be understanded by analyse the Dirac mass as well as the Zeeman splitting or the external-field-induced symmetry-broken, and the changes of gap has a general nonmonotone-variation characteristic under both the effects of electron filed-induced Rashba-coupling R₂(E_⊥) and the electron field-induced band gap, and the band inversion related to the spin-orbit coupling which absorbs both the spin and orbital angular of momentum may happen during this process. The quantized Hall/longitudinal conductivity together with the optical conductivity are also explored, we see that even in the quantum spin Hall phase without any magnetic field, the two-terminate conductivity can be reduced to the value e²/h by controlling the helical edge model, and it can be further reduced to e²/2h by applying the magnetic field which similar to the graphene.

Citations

• Nonequilibrium Gross-Pitaevskii dynamics of boson lattice models
• Solitons in conducting polymers
• Topological Insulators with Inversion Symmetry
• Transition Temperature of Strong-Coupled Superconductors
• Electrons in disordered systems and the theory of localization
• Universal relaxational dynamics near two-dimensional quantum critical points
• Time Evolution and Thermodynamics for the Nonequilibrium System in Phase-Space

Cited by

• Dynamical polarization, plasmon model, and the Friedel oscillation of the screened potential in doped Dirac and Weyl system

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• Can the quantum spin Hall state of silicene be preserved on substrate
• Geometrical structure and the electron transport properties of monolayer and bilayer silicene near the semimetal-insulator transition point in tight-binding model