Two-dimensional Topological Crystalline Insulator Phase in Sb/Bi Planar Honeycomb with Tunable Dirac Gap

Scientific Reports
Chia-Hsiu HsuArun Bansil

Abstract

We predict planar Sb/Bi honeycomb to harbor a two-dimensional (2D) topological crystalline insulator (TCI) phase based on first-principles computations. Although buckled Sb and Bi honeycombs support 2D topological insulator (TI) phases, their structure becomes planar under tensile strain. The planar Sb/Bi honeycomb structure restores the mirror symmetry, and is shown to exhibit non-zero mirror Chern numbers, indicating that the system can host topologically protected edge states. Our computations show that the electronic spectrum of a planar Sb/Bi nanoribbon with armchair or zigzag edges contains two Dirac cones within the band gap and an even number of edge bands crossing the Fermi level. Lattice constant of the planar Sb honeycomb is found to nearly match that of hexagonal-BN. The Sb nanoribbon on hexagonal-BN exhibits gapped edge states, which we show to be tunable by an out-of-the-plane electric field, providing controllable gating of edge state important for device applications.

References

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Citations

Aug 11, 2016·Scientific Reports·Sung-Ping ChenArun Bansil
Sep 5, 2018·Physical Chemistry Chemical Physics : PCCP·Shuai ZhangYing Dai
Feb 9, 2018·Nanoscale Research Letters·Zhi-Quan HuangFeng-Chuan Chuang
Feb 9, 2021·Chemical Reviews·Hadallia BergeronMark C Hersam

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Software Mentioned

Vienna Ab - Initio Simulation Package ( VASP )

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