Intrinsic quantum spin Hall and anomalous Hall effects in: H -Sb/Bi epitaxial growth on a ferromagnetic MnO2 thin film

Jian Zhou, Qiang Sun, Qian Wang, Yoshiyuki Kawazoe, Puru Jena

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Exploring a two-dimensional intrinsic quantum spin Hall state with a large band gap as well as an anomalous Hall state in realizable materials is one of the most fundamental and important goals for future applications in spintronics, valleytronics, and quantum computing. Here, by combining first-principles calculations with a tight-binding model, we predict that Sb or Bi can epitaxially grow on a stable and ferromagnetic MnO2 thin film substrate, forming a flat honeycomb sheet. The flatness of Sb or Bi provides an opportunity for the existence of Dirac points in the Brillouin zone, with its position effectively tuned by surface hydrogenation. The Dirac points in spin up and spin down channels split due to the proximity effects induced by MnO2. In the presence of both intrinsic and Rashba spin-orbit coupling, we find two band gaps exhibiting a large band gap quantum spin Hall state and a nearly quantized anomalous Hall state which can be tuned by adjusting the Fermi level. Our findings provide an efficient way to realize both quantized intrinsic spin Hall conductivity and anomalous Hall conductivity in a single material.

Original languageEnglish
Pages (from-to)11202-11209
Number of pages8
JournalNanoscale
Volume8
Issue number21
DOIs
Publication statusPublished - 2016 Jun 7

ASJC Scopus subject areas

  • Materials Science(all)

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