Two-dimensional ferroelastic topological insulators in single-layer Janus transition metal dichalcogenides MSSe(M=Mo, W)

Yandong Ma, Liangzhi Kou, Baibiao Huang, Ying Dai, Thomas Heine

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Two-dimensional topological insulators and two-dimensional materials with ferroelastic characteristics are intriguing materials and many examples have been reported both experimentally and theoretically. Here, we present the combination of both features - a two-dimensional ferroelastic topological insulator that simultaneously possesses ferroelastic and quantum spin Hall characteristics. Using first-principles calculations, we demonstrate Janus single-layer MSSe(M=Mo,W) stable two-dimensional crystals that show the long-sought ferroelastic topological insulator properties. The material features low switching barriers and strong ferroelastic signals, beneficial for applications in shape memory devices. Moreover, their topological phases harbor sizable nontrivial band gaps, which support the quantum spin Hall effect. The unique coexistence of excellent ferroelastic and quantum spin Hall phases in single-layer MSSe provides extraordinary platforms for realizing multipurpose and controllable devices.

Original languageEnglish
Article number085420
JournalPhysical Review B
Volume98
Issue number8
DOIs
Publication statusPublished - 2018 Aug 14

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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