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arXiv 2007.02291cond-mat.mes-hall
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二维电子粘性

Viscosity of two-dimensional electrons

P. S. Alekseev, A. P. Dmitriev

摘要:

电子输运的流体动力学机制最近已在具有超低缺陷密度的导体中实现。尽管二维流体中的弛豫过程已经在许多理论工作中得到了研究,但对于具有二次能谱且遵循库仑定律相互作用的二维电子费米气体,其粘性至今还没有在理论上或实验上得到可靠的确定。本文建立了这类体系的粘滞系数和导热系数理论。我们将计算出的2D电子费米气体的粘度和先前已知的2D费米液体的粘度与从最佳质量GaAs量子阱的流体动力学负磁电阻中提取的可用实验数据进行比较。基于这种比较,我们认为,测量的粘度的温度依赖性可以允许跟踪电子费米液体和费米气体之间的过渡。

英文摘要:

The hydrodynamic regime of electron transport has been recently realized in conductors with ultra-low densities of defects. Although relaxation processes in two-dimensional (2D) fluids have been studied in many theoretical works, the viscosity of the realistic Fermi gas of 2D electrons having the quadratic energy spectrum and interacting by Coulomb's law has not been reliably determined either in theory or in experiment up to now. Here we construct a theory of viscosity and thermal conductivity in such system. We compare the calculated viscosity of the 2D electron Fermi gas and the previously known viscosity of a 2D Fermi liquid with available experimental data extracted from the hydrodynamic negative magnetoresistance of the best-quality GaAs quantum wells. Based on this comparison, we argue that measurements of the temperature dependence of the viscosity can allow to trace the transition between an electron Fermi liquid and a Fermi gas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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