Negative viscosity and eddy flow of the imbalanced electron-hole liquid in graphene

Negative viscosity and eddy flow of the imbalanced electron-hole liquid in graphene
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石墨烯中不平衡电子空穴液体的负粘度和涡流

DOI:
10.1103/physrevb.99.045434
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发表时间:
2019
期刊:
影响因子:
3.7
通讯作者:
Levchenko, Alex
Levchenko, Alex
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Xie, Hong-Yi;Levchenko, Alex

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我们提出了一个包含载流子-布居不平衡、能量和动量弛豫过程的石墨烯电子-空穴磁输运的流体动力学理论。我们重点研究了电学响应,发现载流子和能量的不平衡驰豫过程强烈地改变了剪切粘度,因此有效粘度可以在电荷中性附近为负值。我们预测了一种突然出现的涡流涡流模式,并探索了它在源电流驱动的石墨烯条带中的非局部电阻率振荡中的表现。
We present a hydrodynamic theory for electron-hole magnetotransport in graphene incorporating carrier-population imbalance, energy, and momentum relaxation processes. We focus on the electric response and find that the carrier and energy imbalance relaxation processes strongly modify the shear viscosity, so that an effective viscosity can be negative in the vicinity of charge neutrality. We predict an emergent eddy flow pattern of swirling currents and explore its manifestation in nonlocal resistivity oscillations in a strip of graphene driven by a source current.
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