Controllable valley filter in graphene topological line defect with magnetic field
Controllable valley filter in graphene topological line defect with magnetic field
复制标题
磁场控制石墨烯拓扑线缺陷的谷滤波器
DOI:
10.1088/1361-648x/ab8ec9
复制
发表时间:
2020-02
期刊:
影响因子:
--
通讯作者:
Tian H. Y.
中科院分区:
文献类型:
--
作者:
Ren C. D.;Lu W. T.;Zhou B. H.;Li Y. F.;Li D. Y.;Wang S. K.;Tian H. Y.
The extended line defect of graphene is an extraordinary candidate in valleytronics while the high valley polarization can only occur for electrons with high incidence angles which brings about tremendous challenges to experimental realization. In this paper, we propose a novel quantum mechanism to filter one conical valley state in the line defect of graphene by applying a local magnetic field. It is found that due to the movement of the Dirac points, the transmission profiles of the two valleys are shifted along the injection-angle axis at the same pace, resulting in the peak transmission of one valley state being reduced drastically while remaining unaffected for the other valley state, which induces nearly perfect valley polarization. The valley polarization effect can occur for all the incident angle and plays a key role in graphene valleytronics.
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DOI:
10.1088/1361-648x/ab3cf4
发表时间:
2019-09
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
作者:
Lin Zhang
通讯作者:
Lin Zhang
影响因子:
3.7
作者:
Artem Pulkin;O. Yazyev
通讯作者:
Artem Pulkin;O. Yazyev
影响因子:
8.6
作者:
Nguyen, V. Hung;Dechamps, S.;Charlier, J. -C.
通讯作者:
Charlier, J. -C.
影响因子:
3.7
作者:
Lin, Xianqing;Ni, Jun
通讯作者:
Ni, Jun
影响因子:
3.7
作者:
Madeleine Phillips;E. Mele
通讯作者:
Madeleine Phillips;E. Mele