Thermopower in the re-entrant insulating phase of a two-dimensional hole system

V. Bayot, X. Ying, M. B. Santos, M. Shayegan

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

We report thermopower measurements on a low-disorder, dilute two-dimensional hole system in a GaAs/AlGaAs heterostructure exhibiting a re-entrant insulating phase around filling factor ν=1/3. As the temperature is lowered, the thermopower vanishes at the integral and fractional quantum Hall states but diverges in the insulating phase, suggesting that an energy gap separates the insulating ground state from its conducting excitations. Our results are consistent with the condensation of the holes into a pinned Wigner solid and, from the onset of the divergence of the thermopower, we derive a phase diagram for the solid-liquid transition.

Original languageEnglish (US)
Pages (from-to)613-618
Number of pages6
JournalEPL
Volume25
Issue number8
DOIs
StatePublished - Mar 10 1994

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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