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arXiv · 2609.08141

Successive Phase Transitions from a Composite Fermion Liquid to a Fractional Quantum Hall State at {\nu}=3/2 Driven by In-Plane Magnetic Field

Xinghao Wang·L. N. Pfeiffer·A. Gupta·K. W. Baldwin·K. W. West·Rui-Rui Du
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Abstract

We report an even-denominator fractional quantum Hall state at {\nu} = 3/2 induced entirely by in-plane magnetic field B_|| in an ultra-high-mobility GaAs quantum well. As B_|| increases, the system undergoes two successive transitions: from a composite fermion liquid to a soft-gap FQH state (B_||~12.2 T), then via a topological phase transition to a hard-gap robust FQH state (B_||~14.7 T), accompanied by a daughter state at {\nu} = 19/13. We present systematic data, and discuss a possible scenario in interpreting these findings. Our work demonstrates that topological order may be engineered through k-space Fermi contour splitting under an in-plane magnetic field.

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Xinghao Wang, L. N. Pfeiffer, A. Gupta, K. W. Baldwin, K. W. West, Rui-Rui Du. 2026-09-08. Successive Phase Transitions from a Composite Fermion Liquid to a Fractional Quantum Hall State at {\nu}=3/2 Driven by In-Plane Magnetic Field. https://arxiv.org/abs/2609.08141

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