Topological Phase Transition in Layered XIn${}_2$P${}_2$ (X = Ca, Sr)

Abstract

Based on fully relativistic first-principles calculations, we studied the topological properties of layered XIn${}_2$P${}_2$ (X = Ca, Sr). Band inversion can be induced by strain without SOC, forming one nodal ring in the k${}_z$ = 0 plane, which is protected by the coexistence of time-reversal and mirror-reflection symmetry. Including SOC, a substantial band gap is opened along the nodal line and the line-node semimetal would evolve into a topological insulator. These results reveal a category of materials showing quantum phase transition from trivial semiconductor and topologically nontrivial insulator by the tuneable elastic strain engineering. Our investigations provide a new perspective about the formation of topological line-node semimetal under stain.

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Cited by in corpus (1)

• Pressure-induced Superconductivity in Zintl Topological Insulator SrIn2As2