Reentrant behavior in the superconducting phase-dependent resistance of a disordered 2-dimensional electron gas

TL;DR

This study explores how the differential resistance in a disordered 2D electron gas coupled to superconductors exhibits reentrant behavior, with oscillations suppressed at low bias voltages, aligning qualitatively with theoretical predictions.

Contribution

It provides experimental evidence of reentrant resistance behavior in a disordered 2D electron gas, highlighting phase-dependent effects and comparing with theoretical models.

Findings

Resistance oscillations increase as energy decreases

Oscillations are suppressed below the Thouless energy

Resistance nearly vanishes at zero bias voltage

Abstract

We have investigated the bias-voltage dependence of the phase-dependent differential resistance of a disordered T-shaped 2-dimensional electron gas coupled to two superconducting terminals. The resistance oscillations first increase upon lowering the energy. For bias voltages below the Thouless energy, the resistance oscillations are suppressed and disappear almost completely at zero bias voltage. We find a qualitative agreement with the calculated reentrant behavior of the resistance and discuss quantitative deviations.