Reentrant nu = 1 quantum Hall state in a two-dimensional hole system

TL;DR

This paper reports the discovery of a reentrant nu=1 quantum Hall state in a 2D hole system within a GaAs quantum well, showing complex behavior under parallel magnetic fields influenced by charge symmetry and density.

Contribution

It presents the first observation of a reentrant nu=1 quantum Hall state in a 2D hole system and explores its dependence on magnetic field, charge distribution symmetry, and density.

Findings

Reentrant nu=1 quantum Hall state observed in 2D hole system.

State weakens and collapses with increasing parallel magnetic field.

State reemerges and strengthens at higher parallel magnetic fields.

Abstract

We report the observation of a reentrant quantum Hall state at the Landau level filling factor nu = 1 in a two-dimensional hole system confined to a 35-nm-wide (001) GaAs quantum well. The reentrant behavior is characterized by a weakening and eventual collapse of the nu = 1 quantum Hall state in the presence of a parallel magnetic field component B||, followed by a strengthening and reemergence as B|| is further increased. The robustness of the nu = 1 quantum Hall state during the transition depends strongly on the charge distribution symmetry of the quantum well, while the magnitude of B|| needed to invoke the transition increases with the total density of the system.