Quantized Anomalous Hall Insulator in a Nanopatterned Two-Dimensional Electron Gas

Details Quantized Anomalous Hall Insulator in a Nanopatterned Two-Dimensional Electron Gas Quantized Anomalous Hall Insulator in a Nanopatterned Two-Dimensional Electron Gas

2010-09-07

arxiv.org/abs/1009.1200v3

Phys. Rev. B 84, 085123 (2011)

Physics

Condensed Matter

Materials Science

5 pages, 5 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.84.085123

We propose that a quantum anomalous Hall insulator (QAHI) can be realized in a nanopatterned two-dimensional electron gas (2DEG) with a small in-plane magnetic field and a high carrier density. The Berry curvatures originating from the in-plane magnetic field and Rashba and Dresselhaus spin-orbit coupling, in combination with a nanoscale honeycomb lattice potential modulation, lead to topologically nontrivial insulating states in the 2DEG without Landau levels. In the bulk insulating gaps, the anomalous Hall conductivity is quantized $-e^{2}/h$, corresponding to a finite Chern number -1. There exists one gapless chiral edge state on each edge of a finite size 2DEG.

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