Electronic transport property in Weyl semimetal with local Weyl cone tilt
Electronic transport property in Weyl semimetal with local Weyl cone tilt
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局部外尔锥倾斜的外尔半金属电子输运特性
DOI：
10.1088/1361-648x/aaade4
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Zheng Yisong
中科院分区：
文献类型：
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作者：
Jiang Liwei;Feng Lanting;Yao Haibo;Zheng Yisong
在实际的外尔半金属（WSM）材料中，由于凝聚态物理学中不存在洛伦兹不变性，所以外尔锥倾斜（WCT）是允许的。在此背景下，我们从理论上研究了以局域WCT为散射机制的WSM中的电子输运性质。在这样做，我们建立了一个电子输运结构的WSM与WCT只发生在中心区域夹在两片半无限WSM没有WCT。采用两种互补的理论方法，即连续模型方法和格子模型方法，分别计算了电子的透射几率、电导率和Fano因子随入射电子能量的变化关系。我们发现，WCT可以引起非平凡的谷间散射，因此，克莱因隧道显着抑制。更重要的是，WSM的最小电导率从外尔节点转移能量。在有WCT的二维WSM中，散粒噪声的Fano因子明显偏离亚泊松值。
In realistic materials of Weyl semimetal (WSM), the Weyl cone tilt (WCT) is allowed due to the absence of Lorentz invariance in condensed matter physics. In this context, we theoretically study the electronic transport property in WSM with the local WCT as the scattering mechanism. In so doing, we establish an electronic transport structure of WSM with the WCT occurring only in the central region sandwiched between two pieces of semi-infinite WSM without the WCT. By means of two complementary theoretical approaches, i.e. the continuum-model method and the lattice-model method, the electronic transmission probability, the conductivity and the Fano factor as functions of the incident electron energy are calculated respectively. We find that the WCT can give rise to nontrivial intervalley scattering, as a result, the Klein tunneling is notably suppressed. More importantly, the minimal conductivity of a WSM shifts in energy from the Weyl nodal point. The Fano factor of the shot noise deviates obviously from the sub-Poissonian value in a two dimensional WSM with the WCT.