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Cited by 258

The DOI matches its Crossref record; 28 of the 28 references it cites were found in a registry or an index.

Quantum anomalous Hall effect in single-layer and bilayer graphene

Open access
Tse, Wang-Kong, Qiao, Zhenhua, Yao, Yugui, MacDonald, A. H., Niu, Qian·2011·Physical Review B
DOI 10.1103/physrevb.83.155447
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Abstract

The quantum anomalous Hall effect can occur in single- and few-layer graphene systems that have both exchange fields and spin-orbit coupling. In this paper, we present a study of the quantum anomalous Hall effect in single-layer and gated bilayer graphene systems with Rashba spin-orbit coupling. We compute Berry curvatures at each valley point and find that for single-layer graphene the Hall conductivity is quantized at ${\ensuremath{\sigma}}_{\mathit{xy}}=2{e}^{2}/h$, with each valley contributing a unit conductance and a corresponding chiral edge state. In bilayer graphene, we find that the quantized anomalous Hall conductivity is twice that of the single-layer case when the gate voltage $U$ is smaller than the exchange field $M$, and zero otherwise. Although the Chern number vanishes when $U>M$, the system still exhibits a quantized valley Hall effect, with the edge states in opposite valleys propagating in opposite directions. The possibility of tuning between different topological states with an external gate voltage suggests possible graphene-based spintronics applications.

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Metadata

Authors
Tse, W.-K., Qiao, Z., Yao, Y., MacDonald, A. H., & Niu, Q.
Venue
Physical Review B
Publisher
American Physical Society (APS)
Published
2011-04-26
Volume
83
Issue
15
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
DOI
10.1103/physrevb.83.155447
OpenAlex
W1991500549
Cited by
258
References
28
FWCI
10.60
Type
journal article
Language
en
Open access
green

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