Competing quantum Hall phases in the second Landau level in low density limit

Abstract

We present in this Letter the results from two high quality, low density GaAs quantum wells. In sample A of electron density n=5.0x10^10 cm^-2, anisotropic electronic transport behavior was observed at ν=7/2 in the second Landau level. We believe that the anisotropy is due to the large Landau level mixing effect in this sample. In sample B of density 4.1x10^10 cm^-2, strong 8/3, 5/2, and 7/3 fractional quantum Hall states were observed. Furthermore, our energy gap data suggest that, similar to the 8/3 state, the 5/2 state may also be spin unpolarized in the low density limit. The results from both samples show that the strong electron-electron interactions and a large Landau level mixing effect play an import role in the competing ground states in the second landau level.

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Cited by in corpus (17)

• Observation of a transition from a topologically ordered to a spontaneously broken symmetry phase
• Valley Isospin Controlled Fractional Quantum Hall States in Bilayer Graphene
• Partial equilibration of integer and fractional edge channels in the thermal quantum Hall effect
• Competing Fractional Quantum Hall and Electron Solid Phases in Graphene
• Electron-Electron Interactions and the Paired-to-Nematic Quantum Phase Transition in the Second Landau Level
• Pomeranchuk Instability of Composite Fermi Liquids
• Observation of an anomalous density-dependent energy gap of the $\nu =5/2$ fractional quantum Hall state in the low density regime
• Complete spin phase diagram of the fractional quantum Hall liquid
• Pair-Density-Wave Order and Paired Fractional Quantum Hall Fluids
• Fractional quantum Hall effect at the filling factor $\nu =5/2$
• PH-Pfaffian order in a translationally and rotationally invariant system
• Competition of Pairing and Nematicity in the Two-Dimensional Electron Gas
• An Anomalous Reentrant 5/2 Quantum Hall Phase at Moderate Landau-Level-Mixing Strength
• Microscopic details of stripes and bubbles in the quantum Hall regime
• Fractional Quantum Hall States of the $\mathcal{A}$ phase in the Second Landau Level
• Possible continuous transition from fractional quantum Hall to stripe phase at ${\nu }_e=7/3$
• Search for Composite Fermions at Filling Factor 5/2: Role of Landau Level and Subband Index