Origin of the hysteresis in bilayer 2D systems in the quantum Hall regime

TL;DR

This paper reveals that hysteresis in bilayer 2D systems under quantum Hall conditions is caused by non-equilibrium induced currents, challenging the previous attribution to charge transfer time constants.

Contribution

The study demonstrates that hysteresis arises from non-equilibrium induced currents rather than charge transfer delays, providing new insight into quantum Hall bilayer systems.

Findings

Hysteresis is due to non-equilibrium induced currents.

Electrometry measurements support the new explanation.

Implications for understanding quantum Hall system hysteresis.

Abstract

The hysteresis observed in the magnetoresistance of bilayer 2D systems in the quantum Hall regime is generally attributed to the long time constant for charge transfer between the 2D systems due to the very low conductivity of the quantum Hall bulk states. We report electrometry measurements of a bilayer 2D system that demonstrate that the hysteresis is instead due to non-equilibrium induced current. This finding is consistent with magnetometry and electrometry measurements of single 2D systems, and has important ramifications for understanding hysteresis in bilayer 2D systems.