Research Paper: Topological Phase Transition of InSb and InBi Under Nonhydrostatic Lattice Expansion

Document Type : Research Paper

Authors

1 M. Sc. Graduated, Department of Physics, Faculty of Basic Sciences, Lorestan University, Khorramabad, Lorestan, Iran

2 Assistant Professor, Department of Physics, Faculty of Basic Sciences, Lorestan University, Khorramabad, Lorestan, Iran

Abstract

This study investigated the topological phase transition of InSb and InBi under a non-hydrostatic lattice using density functional theory and the WIEN2K code. The results of examining the band structure of InSb and InBi employing the mBJGGA exchange-correlation potential indicate that InSb is a semiconductor with a small band gap and normal band order at the Γ point. At the same time, InBi is a metal with band inversion at the Brillouin zone center. To transform these compounds into topological semiconductors, the lattice of these compounds is subjected to non-hydrostatic lattice expansion. Non-hydrostatic lattice expansion is applied in two ways. Firstly, the lattice constants are expanded in the ab plane while keeping the lattice constant along the c-axis constant. Then, the lattice constant is expanded along the c-axis while keeping the lattice constant in the ab plane constant. The calculations indicate that under the influence of both types of non-hydrostatic lattice expansion, with the breaking of cubic symmetry, a transition towards topological semiconductors occurs.

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References

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Iranian Journal of Applied Physics
Volume 14, Issue 3 - Serial Number 38
September 2024
Pages 106-121

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History

  • Receive Date: 11 March 2024
  • Revise Date: 23 May 2024
  • Accept Date: 29 June 2024

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