Thermopower of interacting GaAs Bilayer hole systems in the reentrant insulating phase near v = 1

S. Faniel, E. Tutuc, E. P. De Poortere, C. Gustin, A. Vlad, S. Melinte, M. Shayegan, V. Bayot

Research output: Contribution to journalArticle

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Abstract

We report thermopower measurements of interacting GaAs bilayer hole systems. When the carrier densities in the two layers are equal, these systems exhibit a reentrant insulating phase near the quantum Hall state at total filling factor v = 1. Our data show that, as the temperature is decreased, the thermopower diverges in the insulating phase. This behavior indicates the opening of an energy gap at low temperature, consistent with the formation of a pinned Wigner solid. We extract an energy gap and a Wigner solid melting phase diagram.

Original languageEnglish (US)
Article number046802
JournalPhysical review letters
Volume94
Issue number4
DOIs
StatePublished - Feb 4 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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