Non-linear transport phenomena in a two-subband system

TL;DR

This paper investigates non-linear transport effects in a high-mobility bilayer system with two subbands under magnetic fields, revealing zero-differential-resistance states and Hall field-induced oscillations through experiments and theory.

Contribution

It provides new insights into how direct current and microwave irradiation influence magnetoresistance and oscillations in a two-subband system.

Findings

Observation of zero-differential-resistance states with 1/B periodicity

Hall field-induced resistance oscillations modulating magneto-intersubband oscillations

Influence of direct current on magnetoresistance under microwave irradiation

Abstract

We study non-linear transport phenomena in a high-mobility bilayer system with two closely spaced populated electronic subbands in a perpendicular magnetic field. For a moderate direct current excitation, we observe zero-differential-resistance states with a characteristic 1/B periodicity. We investigate, both experimentally and theoretically, the Hall field-induced resistance oscillations which modulate the high-frequency magneto-intersubband oscillations in our system if we increase the current. We also observe and describe the influence of direct current on the magnetoresistance in the presence of microwave irradiation.