Yesilyurt Can, Siu Zhuo Bin, Tan Seng Ghee, Liang Gengchiau, Yang Shengyuan A, Jalil Mansoor B A
Electrical and Computer Engineering, National University of Singapore, Singapore, 117576, Republic of Singapore.
Department of Optoelectric Physics, Chinese Culture University, Taipei, 11114, Taiwan.
Sci Rep. 2019 Mar 14;9(1):4480. doi: 10.1038/s41598-019-40947-2.
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.
研究了具有倾斜能量色散的外尔半金属中跨电势垒的隧穿输运。我们报告称，当能量色散沿其中一个横向方向倾斜时，不同能谷周围的电子在势垒界面处经历相反方向的折射。势垒界面处的手性相关折射根据能谷指数在角空间中使外尔费米子极化。使用真实的磁势垒配置来选择允许的传输角，这导致了电可控和可切换的能谷极化。我们的发现可能为能谷极化的实验研究以及外尔半金属中的能谷电子学和电子光学应用铺平道路。
