期刊
PHYSICAL REVIEW B
卷 82, 期 11, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.115442
关键词
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资金
- NSFC [10704013, 60525405, 10874175]
- RFDP [200801411042]
- Fundamental Research Funds for the Central Universities [DUT10LK36]
- Swedish International Development Cooperation Agency (SIDA)
- Chinese Academy of Sciences
- Swedish Research Council
- Swedish Foundation for Strategic Research SSF through the Nanometer Structure Consortium at Lund University
We put forward a two-terminal valley filter based on a bulk graphene sheet under the modulations of both a local perpendicular magnetic field and a substrate strain. When only one of the two modulations is present, no valley polarization can be generated. A combination of the two modulations leads to a different (but not opposite) shifts of the K and K' valleys, which could be utilized to generate a valley-polarized current. The degree of the valley polarization can be tuned by the strain strength and the inclusion of a scalar potential. The valley polarization changes its polarity as the local magnetic field switches its direction.
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