Giant low temperature heat capacity of GaAs quantum wells near landau level filling ν = 1

V. Bayot, E. Grivei, S. Melinte, M. B. Santos, M. Shayegan

Research output: Contribution to journalArticle

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Abstract

We report low temperature (T) heat capacity (C) data on a multiple-quantum-well GaAs/AlGaAs sample in the quantum Hall regime. Relative to its low field magnitude, C exhibits up to ∼ 105-fold enhancement near ν = 1 where Skyrmions are the ground state of the confined two-dimensional electrons. We attribute the large C to a Skyrmion-induced, strong coupling of the nuclear spin system to the lattice. The data are consistent with the Schottky nuclear heat capacity of Ga and As atoms in the quantum wells, except at very low T where C vs T exhibits a remarkably sharp peak, suggestive of a phase transition in the electronic system.

Original languageEnglish (US)
Pages (from-to)4584-4587
Number of pages4
JournalPhysical review letters
Volume76
Issue number24
DOIs
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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