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Topological Phase Transition in Sb2Mg3 Assisted by Strain.


ABSTRACT: Topological insulating materials with dissipationless surface states promise potential applications in spintronic materials. Through density functional theory, we proposed a new class of topological phase transition in Sb2Mg3 on the basis of tensile strain. At the equilibrium state, Sb2Mg3 corresponds to a normal insulator, and under the influence of tensile strain, the band gaps are gradually tuned. At ? = 7.2%, the nontrivial phase is achieved due to spin-orbital coupling (SOC), and a nontrivial topological phase band gap of 0.22 eV is opened. As a result, the Dirac cone is locked in the bulk, which is associated to p x,y band crossing. Interestingly, the tuning of nontrivial topological properties with tensile strain leading to spin saturation indicates an orbital-filtering effect. The surface state of the Sb2Mg3 material is determined by the topological invariant, Z 2 = 1, at the critical tensile strain in the presence of the SOC effect. This study enhances the scope of topological insulators and current platforms to design new spintronic devices.

SUBMITTER: Teshome T 

PROVIDER: S-EPMC6648217 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature

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Topological Phase Transition in Sb<sub>2</sub>Mg<sub>3</sub> Assisted by Strain.

Teshome Tamiru T   Datta Ayan A  

ACS omega 20190517 5


Topological insulating materials with dissipationless surface states promise potential applications in spintronic materials. Through density functional theory, we proposed a new class of topological phase transition in Sb<sub>2</sub>Mg<sub>3</sub> on the basis of tensile strain. At the equilibrium state, Sb<sub>2</sub>Mg<sub>3</sub> corresponds to a normal insulator, and under the influence of tensile strain, the band gaps are gradually tuned. At ε = 7.2%, the nontrivial phase is achieved due to  ...[more]

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