Quantum Transport of Disordered Weyl Semimetals at the Nodal Point
Quantum Transport of Disordered Weyl Semimetals at the Nodal Point
复制标题
DOI：
10.1103/physrevlett.113.026602
复制
发表时间：
2014-07-11
影响因子：
8.6
通讯作者：
Brouwer, Piet W.
中科院分区：
文献类型：
--
作者：
Sbierski, Bjoern;Pohl, Gregor;Brouwer, Piet W.
外尔半金属是三维拓扑无隙相的典范。我们在这里解决的影响，无序的电荷传输外尔半金属。对于能量在简并点且没有相互作用的单个外尔节点，理论预测存在临界无序强度，超过该临界无序强度，态密度呈现非零值。然而，对电导率的预测是有分歧的。在这项工作中，我们提出了一个无序的Weyl锥在零能量输运性质的数值研究。对于弱无序，我们的结果是一致的重整化群流到一个有吸引力的pseudoblastically不动点与零电导率和尺度无关的电导;对于较强的无序，扩散行为达到。我们确定的Fano因素作为一个签名，区分这两种制度。
Weyl semimetals are paradigmatic topological gapless phases in three dimensions. We here address the effect of disorder on charge transport in Weyl semimetals. For a single Weyl node with energy at the degeneracy point and without interactions, theory predicts the existence of a critical disorder strength beyond which the density of states takes on a nonzero value. Predictions for the conductivity are divergent, however. In this work, we present a numerical study of transport properties for a disordered Weyl cone at zero energy. For weak disorder, our results are consistent with a renormalization group flow towards an attractive pseudoballistic fixed point with zero conductivity and a scale-independent conductance; for stronger disorder, diffusive behavior is reached. We identify the Fano factor as a signature that discriminates between these two regimes.