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Surface Acoustic Waves (SAW) have been utilized to investigate the propertiesof a two-dimensional electron system, subjected to a perpendicular magneticfield and monochromatic microwave radiation, in the regime where the so-calledmicrowave-induced zero-resistance states form. Contrary to conventionalmagneto-transport in Hall bar and van der Pauw geometries, the collimated SAWbeam probes only the bulk of the electronic system exposed to this wave. Clearsignatures appear in the SAW propagation velocity corroborating that neithercontacts, nor sample edges are a root source for their emergence. By virtue ofthe directional nature of this probing method and with the assistance oftheoretical modelling, we were also able to demonstrate that the SAW responsedepends on the angle between its propagation vector and the orientation ofdomains which spontaneously form when zero-resistance is observed in transport.This confirms in unprecedented manner the formation of an inhomogeneous phaseunder these non-equilibrium conditions.

Acousto-electric study of microwave-induced current domains