Controllable valley filter in graphene topological line defect with magnetic field

Controllable valley filter in graphene topological line defect with magnetic field
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磁场控制石墨烯拓扑线缺陷的谷滤波器

DOI:
10.1088/1361-648x/ab8ec9
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发表时间:
2020-02
期刊:
Journal of physics. Condensed matter
影响因子:
--
通讯作者:
Tian H. Y.
Tian H. Y.
中科院分区:
其他
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.

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石墨烯的延长线缺陷是谷电子学中的一个非凡的候选者,而高谷极化只能发生在高入射角的电子上,这给实验实现带来了巨大的挑战。在本文中,我们提出了一种新颖的量子机制,通过施加局域磁场来过滤石墨烯线缺陷中的锥形谷态。研究发现,由于狄拉克点的移动,两个谷态的透射剖面沿注入角轴以相同的速度移动,导致一个谷态的峰值透射率急剧降低,而另一谷态不受影响,从而产生近乎完美的谷偏振。谷偏振效应可以在所有入射角下发生,并且在石墨烯谷电子学中起着关键作用。
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.
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:
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