Elastic response of the electron fluid in intrinsic graphene: The collisionless regime
Elastic response of the electron fluid in intrinsic graphene: The collisionless regime
复制标题
本征石墨烯中电子流体的弹性响应：无碰撞状态
DOI：
10.1103/physrevb.98.195103
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发表时间：
2018
影响因子：
3.7
通讯作者：
J. Schmalian
中科院分区：
文献类型：
--
作者：
J. Link;D. Sheehy;B. Narozhny;J. Schmalian
电子流体在有限频率下的弹性响应由电子粘度 $\eta(\omega)$ 定义。我们确定了无碰撞状态下石墨烯在电荷中性点处的$\eta(\omega)$，包括由于电子-电子库仑相互作用而导致的主要修正。我们发现，与相应的光导率修正相比，$\eta(\omega)$ 的相互作用修正要大得多。此外，我们发现单粒子和多粒子效应对动态动量通量的贡献相当。我们还证明 $\eta(\omega)$ 与石墨烯在狄拉克点的非局部能量流响应直接相关。无碰撞状态下的粘度是借助 Kubo 形式体系中的应变发生器来确定的。在这里，描述其两个子晶格的石墨烯的赝自旋在获得满足旋转对称系统的对称性的粘度张量方面发挥着重要作用。
The elastic response of an electron fluid at finite frequencies is defined by the electron viscosity $\eta(\omega)$. We determine $\eta(\omega)$ for graphene at the charge neutrality point in the collisionless regime, including the leading corrections due to the electron-electron Coulomb interaction. We find interaction corrections to $\eta(\omega)$ that are significantly larger if compared to the corresponding corrections to the optical conductivity. In addition, we find comparable contributions to the dynamic momentum flux due to single-particle and many-particle effects. We also demonstrate that $\eta(\omega)$ is directly related to the nonlocal energy-flow response of graphene at the Dirac point. The viscosity in the collisionless regime is determined with the help of the strain generators in the Kubo formalism. Here, the pseudo-spin of graphene describing its two sublattices plays an important role in obtaining a viscosity tensor that fulfills the symmetry properties of a rotationally symmetric system.
影响因子：
8.6
作者：
M. Titov;R. Gorbachev;B. Narozhny;T. Tudorovskiy;M. Schütt;P. Ostrovsky;I. Gornyi;A. Mirlin;M. Katsnelson;K. Novoselov;A. Geim;L. Ponomarenko
通讯作者：
M. Titov;R. Gorbachev;B. Narozhny;T. Tudorovskiy;M. Schütt;P. Ostrovsky;I. Gornyi;A. Mirlin;M. Katsnelson;K. Novoselov;A. Geim;L. Ponomarenko