论文标题
GAAS/AlgaAS超高运动二维电子气体中的流体动力电荷传输
Hydrodynamic charge transport in GaAs/AlGaAs ultrahigh-mobility two-dimensional electron gas
论文作者
论文摘要
Viscous fluid in an ultrahigh-mobility two-dimensional electron gas (2DEG) in GaAs/AlGaAs quantum wells is systematically studied through measurements of negative magnetoresistance (NMR) and photoresistance under microwave radiation, and the data are analyzed according to recent theoretical work by e.g., Alekseev, Physical Review Letters 117,166601 (2016).发现尺寸依赖性和依赖温度的NMR符合理论预测。特别是，库仑相互作用相对较弱（颗粒间相互作用参数r_s <1）的2DEG的运输表现出粘性液体和粘性气体之间的交叉。微波诱导的电阻振荡和“第二谐波”峰的尺寸依赖性表明，中等磁场中的2DEG也应被视为粘性流体。我们的结果表明，必须考虑流体动力效应，以便了解清洁二维的半经典电子传输。
Viscous fluid in an ultrahigh-mobility two-dimensional electron gas (2DEG) in GaAs/AlGaAs quantum wells is systematically studied through measurements of negative magnetoresistance (NMR) and photoresistance under microwave radiation, and the data are analyzed according to recent theoretical work by e.g., Alekseev, Physical Review Letters 117,166601 (2016). Size-dependent and temperature dependent NMR are found to conform to the theoretical predictions. In particular, transport of 2DEG with relatively weak Coulomb interaction (interparticle interaction parameter r_s<1) manifests a crossover between viscous liquid and viscous gas. The size dependence of microwave induced resistance oscillations and that of the '2nd harmonic' peak indicate that 2DEG in a moderate magnetic field should be regarded as viscous fluid as well. Our results suggest that the hydrodynamic effects must be considered in order to understand semiclassical electronic transport in a clean 2DEG.
