Electrically tunable spin polarization of chiral edge modes in a quantum anomalous Hall insulator

Rui Xing Zhang, Hsiu Chuan Hsu, Chao Xing Liu

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

In the quantum anomalous Hall effect, chiral edge modes are expected to conduct spin polarized current without dissipation and thus hold great promise for future electronics and spintronics with low energy consumption. However, spin polarization of chiral edge modes has never been established in experiments. In this work, we theoretically study spin polarization of chiral edge modes in the quantum anomalous Hall effect, based on both the effective model and more realistic tight-binding model constructed from first-principles calculations. We find that spin polarization can be manipulated by tuning either a local gate voltage or the Fermi energy. We also propose to extract spin information of chiral edge modes by contacting the quantum anomalous Hall insulator to a ferromagnetic lead. The establishment of spin polarization of chiral edge modes, as well as the manipulation and detection in a fully electrical manner, will pave the way to the applications of the quantum anomalous Hall effect in spintronics.

Original languageEnglish (US)
Article number235315
JournalPhysical Review B
Volume93
Issue number23
DOIs
StatePublished - Jun 27 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Electrically tunable spin polarization of chiral edge modes in a quantum anomalous Hall insulator'. Together they form a unique fingerprint.

Cite this