Out-of-Bounds Hydrodynamics in Anisotropic Dirac Fluids
Out-of-Bounds Hydrodynamics in Anisotropic Dirac Fluids
复制标题
DOI：
10.1103/physrevlett.120.196801
复制
发表时间：
2018-05-10
影响因子：
8.6
通讯作者：
Schmalian, Joerg
中科院分区：
文献类型：
--
作者：
Link, Julia M.;Narozhny, Boris N.;Schmalian, Joerg
我们研究二维相互作用电子系统中的流体动力学输运，并在电荷中性处合并狄拉克点。沿沿着一个晶向的色散是类狄拉克色散，而沿正交方向的色散是类牛顿色散。因此，导电性在一个方向上是金属的，而在另一个方向上是绝缘的。剪切粘度张量包含六个独立的分量，可以通过测量各向异性热流来探测。其中一个粘度分量在零温度下消失，导致先前的剪切粘度与熵密度比的下限的泛化。
We study hydrodynamic transport in two-dimensional, interacting electronic systems with merging Dirac points at charge neutrality. The dispersion along one crystallographic direction is Dirac-like, while it is Newtonian-like in the orthogonal direction. As a result, the electrical conductivity is metallic in one and insulating in the other direction. The shear viscosity tensor contains six independent components, which can be probed by measuring an anisotropic thermal flow. One of the viscosity components vanishes at zero temperature leading to a generalization of the previously conjectured lower bound for the shear viscosity to entropy density ratio.