Hydrodynamic Approach to Electronic Transport in Graphene: Energy Relaxation
Hydrodynamic Approach to Electronic Transport in Graphene: Energy Relaxation
复制标题
石墨烯中电子传输的流体动力学方法：能量弛豫
作者：
B. Narozhny;I. Gornyi
在近补偿石墨烯中，无序辅助电子声子散射或“超级碰撞”负责准粒子复合和能量弛豫。在流体动力学方法中，这些过程为局部平衡（即“理想”流体动力学水平）的连续性方程提供了弱衰减项。在这里，我们报告了由于弱违反能量守恒而导致的衰减项的推导。由于每个能带中粒子数量的不守恒，这些项必须与众所周知的重组项同等对待。在“流体动力学状态”中足够高的温度下，超碰撞主导两种类型的衰变项（与主阶电子-声子相互作用相比）。我们还讨论了超级碰撞对传热方程的贡献（概括了粘性流体动力学中能量密度的连续性方程）。
In nearly compensated graphene, disorder-assisted electron-phonon scattering or “supercollisions” are responsible for both quasiparticle recombination and energy relaxation. Within the hydrodynamic approach, these processes contribute weak decay terms to the continuity equations at local equilibrium, i.e., at the level of “ideal” hydrodynamics. Here we report the derivation of the decay term due to weak violation of energy conservation. Such terms have to be considered on equal footing with the well-known recombination terms due to nonconservation of the number of particles in each band. At high enough temperatures in the “hydrodynamic regime” supercollisions dominate both types of the decay terms (as compared to the leading-order electron-phonon interaction). We also discuss the contribution of supercollisions to the heat transfer equation (generalizing the continuity equation for the energy density in viscous hydrodynamics).
石墨烯中不平衡电子空穴液体的负粘度和涡流
影响因子：
3.7
作者：
Xie, Hong-Yi;Levchenko, Alex
通讯作者：
Levchenko, Alex
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