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arXiv · 1601.04215

Unusual Landau Level Pinning and Correlated $ν=1$ Quantum Hall Effect in Hole Systems Confined to Wide GaAs Quantum Wells

Yang Liu·S. Hasdemir·M. Shayegan·L. N. Pfeiffer·K. W. West·K. W. Baldwin
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Abstract

In two-dimensional hole systems confined to wide GaAs quantum wells, where the heavy- and light- hole states are close in energy, we observe a very unusual crossing of the lowest two Landau levels as the sample is tilted in magnetic field. At a magic tilt angle $θ\simeq 34^{\circ}$, which surprisingly is independent of the well-width or hole density, in a large filling factor range near $ν=1$ the lowest two levels are nearly degenerate as evinced by the presence of two-component quantum Hall states. Remarkably, a quantum Hall state is seen at $ν=1$, consistent with a \textit{correlated} $Ψ_{111}$ state.

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Yang Liu, S. Hasdemir, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin. 2016-01-16. Unusual Landau Level Pinning and Correlated $ν=1$ Quantum Hall Effect in Hole Systems Confined to Wide GaAs Quantum Wells. https://doi.org/10.1103/physrevb.92.195156

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