Microwave-induced magnetooscillations and signatures of zero-resistance states in phonon-drag voltage in two-dimensional electron systems

TL;DR

This paper reports the observation of microwave-induced resistance oscillations and zero-resistance states in a two-dimensional electron system, revealing their signatures in phonon-drag voltage and suggesting the existence of current domains without external bias.

Contribution

It demonstrates the correlation between resistance oscillations and phonon-drag voltage under microwave irradiation, providing new insights into zero-resistance states in 2D electron gases.

Findings

Resistance oscillations correlate with phonon-drag voltage oscillations.

Zero-resistance states show sharp features in phonon-drag voltage.

Current domains may exist without external dc driving in zero-resistance states.

Abstract

We observe the phonon-drag voltage oscillations correlating with the resistance oscillations under microwave irradiation in a two-dimensional electron gas in perpendicular magnetic field. This phenomenon is explained by the influence of dissipative resistivity modified by microwaves on the phonon-drag voltage perpendicular to the phonon flux. When the lowest-order resistance minima evolve into zero-resistance states, the phonon-drag voltage demonstrates sharp features suggesting that current domains associated with these states can exist in the absence of external dc driving.