Reentrant ν = 1 Quantum Hall State in a Two-Dimensional Hole System

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{parallel}, followed by a strengthening and reemergence as B{parallel} 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{parallel} needed to invoke the transition increases with the total density of the system.