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.

5 pages, 5 figures

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• Edge state preparation in one dimensional lattice by quantum Lyapunov control
• Intrinsic higher-order topological states in 2D honeycomb Z_2 quantum spin Hall insulators
• Atomically Abrupt Topological p-n Junction