Phys. Rev. Lett. 94, 046802 (2005) [4 pages]Thermopower of Interacting GaAs Bilayer Hole Systems in the Reentrant Insulating Phase Near ν=1Received 30 August 2004; published 2 February 2005 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 ν=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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.046802
DOI:
10.1103/PhysRevLett.94.046802
PACS:
73.40.–c, 71.30.+h, 73.50.Lw
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