Corbino-Enhanced Supersonic Acoustic-Emission Threshold in a GaAs Two-Dimensional Electron System
This study demonstrates that a high-mobility GaAs two-dimensional electron system in a Corbino geometry exhibits a polarity-selective threshold in differential resistance at zero magnetic field, which is interpreted as a local Cherenkov-like condition for supersonic acoustic phonon emission driven by radial current concentration and modulated by Peltier heating near the inner contact.
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