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.

References in corpus (6)

• Non-Abelian Anyons and Topological Quantum Computation
• Fractional Quantum Hall Effect in the Second Landau Level
• Intrinsic Gap of the nu=5/2 Fractional Quantum Hall State
• Tilt-Induced Anisotropic to Isotropic Phase Transition at $\nu =5/2$
• Impact of spin-orbit coupling on quantum Hall nematic phases
• Quantum Hall ferromagnetic states and spin-orbit interactions in the fractional regime

Cited by in corpus (4)

• Fractional quantum Hall effect at the filling factor $\nu =5/2$
• An Anomalous Reentrant 5/2 Quantum Hall Phase at Moderate Landau-Level-Mixing Strength
• 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 ${\nu }_e=7/3$