Observation of Apparently Zero-Conductance States in Corbino Samples

TL;DR

This paper reports the observation of oscillatory conductance in high-mobility 2D electron systems under microwave and magnetic fields, with some minima showing near-zero conductance suggesting possible insulating states.

Contribution

First observation of oscillatory conductance and potential insulating states in Corbino samples under combined microwave and magnetic fields.

Findings

Oscillatory conductance observed in 2D electron systems.

Near-zero conductance at certain minima indicating possible insulator states.

Conductance oscillations linked to microwave and magnetic field interactions.

Abstract

Using Corbino samples we have observed oscillatory conductance in a high-mobility two-dimensional electron system subjected to crossed microwave and magnetic fields. On the strongest of the oscillation minima the conductance is found to be vanishingly small, possibly indicating an insulating state associated with these minima.