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

S. A. Myers, Haoyun Huang, Waseem Hussain, L. N. Pfeiffer, K. W. West, G. A. Csáthy

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article numberL022056
JournalPhysical Review Research
Volume6
Issue number2
DOIs
StatePublished - Apr 2024
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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