Quantum anomalous hall effect with higher plateaus

Jing Wang, Biao Lian, Haijun Zhang, Yong Xu, Shou Cheng Zhang

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

The quantum anomalous Hall (QAH) effect in magnetic topological insulators is driven by the combination of spontaneous magnetic moments and spin-orbit coupling. Its recent experimental discovery raises the question if higher plateaus can also be realized. Here, we present a general theory for a QAH effect with higher Chern numbers and show by first-principles calculations that a thin film magnetic topological insulator of Cr-doped Bi2(Se,Te) 3 is a candidate for the C=2 QAH insulator. Remarkably, whereas a higher magnetic field leads to lower Hall conductance plateaus in the integer quantum Hall effect, a higher magnetic moment leads to higher Hall conductance plateaus in the QAH effect.

Original languageEnglish (US)
Article number136801
JournalPhysical review letters
Volume111
Issue number13
DOIs
StatePublished - Sep 24 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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