期刊
APPLIED PHYSICS LETTERS
卷 98, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3543899
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资金
- NSFC [10704013]
- RFDP [200801411042]
- Fundamental Research Funds for the Central Universities [DUT10LK36]
We study the transport properties of Dirac fermions on the surface of a topological insulator attached with a spiral multiferroic oxide (SMO). For the spiral plane of the SMO parallel to the spiral axis and the surface normal, the proximity-induced exchange field causes a particle-hole asymmetry and a transmission gap near the Dirac point. The transmission gap interval depends on the spiral wave vector q. This fact together with the tunability of q by gate voltages indicates an electric switch with high on-off ratios. The dependence of the conductance on the orientation of the spiral plane is also examined. (C) 2011 American Institute of Physics. [doi:10.1063/1.3543899]
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