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arXiv · 1607.03956

Morphing of 2D Hole Systems at $ν=3/2$ in Parallel Magnetic Fields: Compressible, Stripe, and Fractional Quantum Hall Phases

Yang Liu·M. A. Mueed·Md. Shafayat Hossain·S. Hasdermir·L. N. Pfeiffer·K. W. West·K. W. Baldwin·M. Shayegan
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Abstract

A transport study of two-dimensional (2D) holes confined to wide GaAs quantum wells provides a glimpse of a subtle competition between different many-body phases at Landau level filling $ν=3/2$ in tilted magnetic fields. At large tilt angles ($θ$), an anisotropic, stripe (or nematic) phase replaces the isotropic compressible Fermi sea at $ν=3/2$ if the quantum well has a symmetric charge distribution. When the charge distribution is made asymmetric, instead of the stripe phase, an even-denominator fractional quantum state appears at $ν=3/2$ in a range of large $θ$, and reverts back to a compressible state at even higher $θ$. We attribute this remarkable evolution to the significant mixing of the excited and ground-state Landau levels of 2D hole systems in tilted fields.

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Yang Liu, M. A. Mueed, Md. Shafayat Hossain, S. Hasdermir, L. N. Pfeiffer, K. W. West, K. W. Baldwin, M. Shayegan. 2016-07-13. Morphing of 2D Hole Systems at $ν=3/2$ in Parallel Magnetic Fields: Compressible, Stripe, and Fractional Quantum Hall Phases. https://doi.org/10.1103/physrevb.94.155312

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