Electrically tunable multiple Dirac cones in thin films of the (Lao)2 (SbSe2)2 family of materials

Xiao Yu Dong, Jian Feng Wang, Rui Xing Zhang, Wen Hui Duan, Bang Fen Zhu, Jorge O. Sofo, Chao Xing Liu

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Two-dimensional Dirac physics has aroused great interests in condensed matter physics ever since the discovery of graphene and topological insulators. The ability to control the properties of Dirac cones, such as bandgap and Fermi velocity, is essential for various new phenomena and the next-generation electronic devices. On the basis of first-principles calculations and an analytical effective model, we propose a new Dirac system with eight Dirac cones in thin films of the (LaO)2 (SbSe2)2 family of materials, which has the advantage in its tunability: the existence of gapless Dirac cones, their positions, Fermi velocities and anisotropy all can be controlled by an experimentally feasible electric field. We identify layer-dependent spin texture induced by spin-orbit coupling as the underlying physical reason for electrical tunability of this system. Furthermore, the electrically tunable quantum anomalous Hall effect with a high Chern number can be realized by introducing magnetization into this system.

Original languageEnglish (US)
Article number8517
JournalNature communications
Volume6
DOIs
StatePublished - Oct 13 2015

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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