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Research Article

Group 14 element-based non-centrosymmetric quantum spin Hall insulators with large bulk gap

Yandong Ma1( ), Liangzhi Kou2, Aijun Du2, Thomas Heine1( )
Department of Physics and Earth ScienceJacobs University BremenCampus Ring 1Bremen28759Germany
School of ChemistryPhysics and Mechanical EngineeringQueensland University of TechnologyBrisbaneQueensland4001Australia
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Abstract

To date, a number of two-dimensional (2D) topological insulators (TIs) have been realized in Group 14 elemental honeycomb lattices, but all are inversionsymmetric. Here, based on first-principles calculations, we predict a new family of 2D inversion-asymmetric TIs with sizeable bulk gaps from 105 meV to 284 meV, in X2–GeSn (X = H, F, Cl, Br, I) monolayers, making them in principle suitable for room-temperature applications. The nontrivial topological characteristics of inverted band orders are identified in pristine X2–GeSn with X = (F, Cl, Br, I), whereas H2–GeSn undergoes a nontrivial band inversion at 8% lattice expansion. Topologically protected edge states are identified in X2–GeSn with X = (F, Cl, Br, I), as well as in strained H2–GeSn. More importantly, the edges of these systems, which exhibit single-Dirac-cone characteristics located exactly in the middle of their bulk band gaps, are ideal for dissipationless transport. Thus, Group 14 elemental honeycomb lattices provide a fascinating playground for the manipulation of quantum states.

Keywords

two-dimensional crystaltopological insulatorsDirac statesband inversionstrain engineeringGroup 14 honeycomb lattice

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Nano Research
Volume 8 Issue 10,
October 2015
Pages 3412-3420
DOI: 10.1007/s12274-015-0842-7
Cite this article:
Ma Y, Kou L, Du A, et al. Group 14 element-based non-centrosymmetric quantum spin Hall insulators with large bulk gap. Nano Research, 2015, 8(10): 3412-3420. https://doi.org/10.1007/s12274-015-0842-7

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Received: 28 March 2015
Revised: 15 June 2015
Accepted: 18 June 2015
Published: 08 September 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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