Hydrodynamic charge transport in ultrahigh-mobility two-dimensional electron gas
ORAL
Abstract
Viscous fluid in an ultrahigh-mobility (between 2 to 3*10^7 cm^2/Vs) two-dimensional electron gas (2DEG) in GaAs/AlGaAs quantum wells was systematically studied through measurements of negative magnetoresistance (NMR) and photoresistance under microwave radiation, and the data were analyzed according to recent theoretical works by e.g., Alekseev, Physical Review Letters 117,166601 (2016). Size-dependent and temperature dependent NMR were found to conform to the theoretical predictions. The size dependence of microwave induced resistance oscillations (MIRO) 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.
*The work at PKU was funded by the National Key R&D Program of China, by the Strategic Priority Research Program of Chinese Academy of Sciences. The work at Princeton was funded by the Gordon and Betty Moore Foundation through the EPiQS, by the National Science Foundation.
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Publication: arXiv:2205.10196
Presenters
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Xinghao Wang
- Peking University