Electrically tunable valley polarization in Weyl semimetals with tilted energy dispersion
Electrically tunable valley polarization in Weyl semimetals with tilted energy dispersion
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DOI：
10.1038/s41598-019-40947-2
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发表时间：
2017-05
影响因子：
4.6
通讯作者：
C. Yesilyurt;Z. Siu;S. G. Tan;G. Liang;Shengyuan A. Yang;M. Jalil
中科院分区：
文献类型：
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作者：
C. Yesilyurt;Z. Siu;S. G. Tan;G. Liang;Shengyuan A. Yang;M. Jalil
本文研究了具有倾斜能量色散的Weyl半金属中钨的跨势垒输运。当能量色散沿其中一个横向方向沿着倾斜时，不同谷周围的电子在势垒界面处经历相反方向的折射。手征相关的折射在势垒界面的外尔费米子在角空间根据其谷指数。一个真实的磁势垒配置用于选择允许的传输角，这导致在电气可控和可切换的谷极化。我们的研究结果可能铺平了道路谷极化的实验研究，以及谷电子和电子光学应用外尔半金属。
Tunneling transport across electrical potential barriers in Weyl semimetals with tilted energy dispersion is investigated. We report that the electrons around different valleys experience opposite direction refractions at the barrier interface when the energy dispersion is tilted along one of the transverse directions. Chirality dependent refractions at the barrier interface polarize the Weyl fermions in angle-space according to their valley index. A real magnetic barrier configuration is used to select allowed transmission angles, which results in electrically controllable and switchable valley polarization. Our findings may pave the way for experimental investigation of valley polarization, as well as valleytronic and electron optic applications in Weyl semimetals.