Acousto-electric study of microwave-induced current domains

Abstract

Surface Acoustic Waves (SAW) have been utilized to investigate the properties of a two-dimensional electron system, subjected to a perpendicular magnetic field and monochromatic microwave radiation, in the regime where the so-called microwave-induced zero-resistance states form. Contrary to conventional magneto-transport in Hall bar and van der Pauw geometries, the collimated SAW beam probes only the bulk of the electronic system exposed to this wave. Clear signatures appear in the SAW propagation velocity corroborating that neither contacts, nor sample edges are a root source for their emergence. By virtue of the directional nature of this probing method and with the assistance of theoretical modelling, we were also able to demonstrate that the SAW response depends on the angle between its propagation vector and the orientation of domains which spontaneously form when zero-resistance is observed in transport. This confirms in unprecedented manner the formation of an inhomogeneous phase under these non-equilibrium conditions.

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Cited by in corpus (6)

• Demonstration of high sensitivity of microwave-induced resistance oscillations to circular polarization
• Probing quantum phases in ultra-high-mobility two-dimensional electron systems using surface acoustic waves
• Observation of High Harmonics of the Cyclotron Resonance in Microwave Transmission of a High-Mobility Two-Dimensional Electron System
• Interaction between Surface Acoustic Wave and Quantum Hall Effects
• A high-performance surface acoustic wave sensing technique
• Anomalous acousto-current within the quantum Hall plateaus