Nonmonotonic magnetoresistance of a two-dimensional viscous electron-hole fluid in a confined geometry
Nonmonotonic magnetoresistance of a two-dimensional viscous electron-hole fluid in a confined geometry
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DOI：
10.1103/physrevb.97.085109
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发表时间：
2017-11
影响因子：
3.7
通讯作者：
P. Alekseev;A. Dmitriev;I. Gornyi;V. Kachorovskii;B. Narozhny;M. Titov
中科院分区：
文献类型：
--
作者：
P. Alekseev;A. Dmitriev;I. Gornyi;V. Kachorovskii;B. Narozhny;M. Titov
超纯导体可能表现出流体动力学输运，其中载流子的集体运动类似于粘性流体的流动。在一个受限的几何结构中（例如，在超高质量的纳米结构中），电子流体呈现出一种类似泊泽维尔的流动。施加外磁场往往会减少导致大负磁阻的粘性效应。在接近电荷中性的双组分体系中，载流子的流体动力流动受到两组分之间相互摩擦的强烈影响。在低场中，磁电阻为负，而在高场中，电子-空穴散射、复合和粘度之间的相互作用导致了流动曲线的剧烈变化：磁电阻改变了其符号，并最终在非常高的场中变为线性。这种新颖的非单调磁电阻可以作为一种指纹来检测双组分导电系统中的粘性流动。
Ultra-pure conductors may exhibit hydrodynamic transport where the collective motion of charge carriers resembles the flow of a viscous fluid. In a confined geometry (e.g., in ultra-high quality nanostructures) the electronic fluid assumes a Poiseuille-like flow. Applying an external magnetic field tends to diminish viscous effects leading to large negative magnetoresistance. In two-component systems near charge neutrality the hydrodynamic flow of charge carriers is strongly affected by the mutual friction between the two constituents. At low fields, the magnetoresistance is negative, however at high fields the interplay between electron-hole scattering, recombination, and viscosity results in a dramatic change of the flow profile: the magnetoresistance changes its sign and eventually becomes linear in very high fields. This novel non-monotonic magnetoresistance can be used as a fingerprint to detect viscous flow in two-component conducting systems.