Two-dimensional topological crystalline insulator phase in Sb/Bi planar honeycomb with tunable Dirac gap

Hsu, Chia -Hsiu; Huang, Zhi -Quan; Crisostomo, Christian P.; Yao, Liang -Zi; Chuang, Feng -Chuan; Liu, Yu -Tzu; Wang, Baokai; Hsu, Chuang -Han; Lee, Chi -Cheng; Lin, Hsin; Bansil, Arun

doi:10.1038/srep18993

Two-dimensional topological crystalline insulator phase in Sb/Bi planar honeycomb with tunable Dirac gap

Journal Article · Thu Jan 14 00:00:00 EST 2016 · Scientific Reports

DOI:https://doi.org/10.1038/srep18993· OSTI ID:1238779

Hsu, Chia -Hsiu ^[1]; Huang, Zhi -Quan ^[2]; Crisostomo, Christian P. ^[2]; Yao, Liang -Zi ^[2]; Chuang, Feng -Chuan ^[2]; Liu, Yu -Tzu ^[3]; Wang, Baokai ^[4]; Hsu, Chuang -Han ^[3]; Lee, Chi -Cheng ^[3]; Lin, Hsin ^[3]; Bansil, Arun ^[5]

National Sun Yat-Sen Univ., Kaohsiung (Taiwan); Northeastern University
National Sun Yat-Sen Univ., Kaohsiung (Taiwan)
National Univ. of Singapore (Singapore)
National Univ. of Singapore (Singapore); Northeastern Univ., Boston, MA (United States)
Northeastern Univ., Boston, MA (United States)

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. As a result, 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.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for the Computational Design of Functional Layered Materials (CCDM); Northeastern Univ., Boston, MA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0012575

OSTI ID:: 1238779

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Vol. 6; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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