Thermal activation signatures of the Anderson insulator and the Wigner solid forming near ν = 1

When interactions overcome disorder, integer quantum Hall plateaus support topological phases with different bulk insulators. In the center of the ν = 1 plateau the bulk is an Anderson-type insulator, while in the flanks of the plateau the bulk is the integer quantum Hall Wigner solid. We find that...

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Veröffentlicht in:Physical review research 2024-06, Vol.6 (2), Article L022056
Hauptverfasser: Myers, S. A., Huang, Haoyun, Hussain, Waseem, Pfeiffer, L. N., West, K. W., Csáthy, G. A.
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container_title Physical review research
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Huang, Haoyun
Hussain, Waseem
Pfeiffer, L. N.
West, K. W.
Csáthy, G. A.
description When interactions overcome disorder, integer quantum Hall plateaus support topological phases with different bulk insulators. In the center of the ν = 1 plateau the bulk is an Anderson-type insulator, while in the flanks of the plateau the bulk is the integer quantum Hall Wigner solid. We find that the activation energy along the ν = 1 plateau exhibits a very dramatic nonmonotonic dependence on the magnetic field, a dependence that is strongly correlated with the stability regions of the two phases. Furthermore, the activation energy has an unexpected minimum at the boundary between the Anderson insulator and the Wigner solid. Our findings constrain the theory of the integer quantum Hall Wigner solid, determine its thermodynamic properties, and reveal unusual behavior at the boundary between the Anderson insulator and the Wigner solid.
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subjects Anderson localization
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Magnetic texture
Quantum Hall effects
Quasiparticles & collective excitations
Topological order
Topological phases
Topological phases of matter
Wigner crystal
Wigner solid
title Thermal activation signatures of the Anderson insulator and the Wigner solid forming near ν = 1
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