Anomalous High-Temperature Magnetoresistance in a Dilute 2D Hole System
Anomalous High-Temperature Magnetoresistance in a Dilute 2D Hole System
复制标题
稀二维孔系统中的反常高温磁阻
DOI：
10.1103/physrevlett.130.266302
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发表时间：
2023
影响因子：
8.6
通讯作者：
West, Kenneth W.
中科院分区：
文献类型：
--
作者：
Kumar, Arvind Shankar;Liu, Chieh-Wen;Liu, Shuhao;Gao, Xuan P. A.;Levchenko, Alex;Pfeiffer, Loren N.;West, Kenneth W.
本文报道了在密度为的二维稀孔系统量子威尔斯中，库仑能与费米能之比为20-30时，磁电阻随温度的增加而增强的现象。我们表明，虽然系统表现出负的抛物线磁电阻在低温下（）特性的相互作用的费米液体，一个积极的磁电阻意外地出现在较高的温度，并随着温度的增加，即使在政权，接近费米能量。这种不寻常的正磁阻在高温下可以归因于粘性运输的二维空穴流体的流体动力学制度，空穴经常相互散射。这些发现提供了深入了解集体运输的强烈相互作用的载体在制度和新的路线在高温下的磁阻。
We report an unusual magnetoresistance that strengthens with the temperature in a dilute two-dimensional (2D) hole system inquantum wells with densitieswhere, the ratio between Coulomb energy and Fermi energy, is as large as 20–30. We show that, while the system exhibits a negative parabolic magnetoresistance at low temperatures () characteristic of an interacting Fermi liquid, a positive magnetoresistance emerges unexpectedly at higher temperatures, and grows with increasing temperature even in the regime, close to the Fermi energy. This unusual positive magnetoresistance at high temperatures can be attributed to the viscous transport of 2D hole fluid in the hydrodynamic regime where holes scatter frequently with each other. These findings give insight into the collective transport of strongly interacting carriers in theregime and new routes toward magnetoresistance at high temperatures.