论文标题
超细薄片中弱表面散射的pARA融化动力学
Para-hydrodynamics from weak surface scattering in ultraclean thin flakes
论文作者
论文摘要
电子流体力学通常在电子流体中以高电子电子碰撞速率出现。但是，WTE $ _2 $薄薄的薄片的新实验表明，其他支持动量的散射过程可以替代电子电子相互作用的作用，从而导致一种新颖的，所谓的para-hyydrolannical动力学制度。在这里，我们开发了用于流式动力传输的动力学理论。为此，我们考虑在薄薄的3维纸中考虑一种弹道电子气体，其中动量 - 重汇率（$ \ ell_ {Mr} $）和势头强化（$ \ ell_ {MC {MC {MC {MC} $）平均自由路径由于从粗糙表面散射边界而减少了自由路径。然后，通过板边界的显微镜参数表达了电子流的有效平均自由路径，预测具有$ \ ell_ {MR} \ gg \ gg \ gg \ ell_ {mc} $的para-hydrodnannalnannic engime在超级三维材料中泛滥成灾。使用我们的方法，我们恢复了与现有实验良好一致的para-Hydrodnannalnannalnalnannalnannalnalnalnalnanciment中的WTE $ _2 $的运输属性。
Electron hydrodynamics typically emerges in electron fluids with a high electron-electron collision rate. However, new experiments with thin flakes of WTe$_2$ have revealed that other momentum-conserving scattering processes can replace the role of the electron-electron interaction, thereby leading to a novel, so-called para-hydrodynamic regime. Here, we develop the kinetic theory for para-hydrodynamic transport. To this end, we consider a ballistic electron gas in a thin 3-dimensional sheet where the momentum-relaxing ($\ell_{mr}$) and momentum-conserving ($\ell_{mc}$) mean free paths are decreased due to boundary scattering from a rough surface. The resulting effective mean free path of the electronic flow is then expressed in terms of microscopic parameters of the sheet boundaries, predicting that a para-hydrodynamic regime with $\ell_{mr}\gg \ell_{mc}$ emerges generically in ultraclean three-dimensional materials. Using our approach, we recover the transport properties of WTe$_2$ in the para-hydrodynamic regime in good agreement with existing experiments.
