The edge engineering of topological Bi(111) bilayer

Abstract

A topological insulator is a novel quantum state, characterized by symmetry-protected non-trivial edge/surface states. Our first-principle simulations show the significant effects of the chemical decoration on edge states of topological Bi(111) bilayer nanoribbon, which remove the trivial edge state and recover the Dirac linear dispersion of topological edge state. By comparing the edge states with and without chemical decoration, the Bi(111) bilayer nanoribbon offers a simple system for assessing conductance fluctuation of edge states. The chemical decoration can also modify the penetration depth and the spin texture of edge states. A low-energy effective model is proposed to explain the distinctive spin texture of Bi(111) bilayer nanoribbon, which breaks the spin-momentum orthogonality along the armchair edge.

arXiv comment5 pages, 5 figures

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• Quantum Spin Hall Effect and Topological Phase Transition in Two-Dimensional Square Transition Metal Dichalcogenides
• Atomically Thin Quantum Spin Hall Insulators
• Visualizing topological edge states of single and double bilayer Bi supported on multibilayer Bi(111) films
• Disorder Effects in Topological States -- Brief Review of the Recent Developments
• Engineering electronic structure of a 2D topological insulator Bi(111) bilayer on Sb nanofilms by quantum confinement effect
• New Group V Elemental Bilayers: A Tunable Structure Model with 4,6,8-atom Rings
• Electric control of the edge magnetization in zigzag stanene nanoribbon
• Topological phases in Bi/Sb planar and buckled honeycomb monolayers
• Stability of topological properties of bismuth (111) bilayer
• Engineering Topological quantum dot through planar magnetization in bismuthene
• Interfacial-state coupling induced topological phase transitions in SnTe (110) thin film
• Localized Wannier function based tight-binding models for two-dimensional allotropes of bismuth
• Edge state preparation in one dimensional lattice by quantum Lyapunov control
• Competing edge structures of Sb and Bi bilayers by trivial and nontrivial band topologies
• Entanglement entropy and entanglement spectrum of Bi${}_{1-x}$Sb${}_x$ (111) bilayers
• Intrinsic higher-order topological states in 2D honeycomb Z_2 quantum spin Hall insulators
• Atomically Abrupt Topological p-n Junction