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Giant low temperature heat capacity of GaAs quantum wells near Landau level filling nu = 1.

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Bayot, Vincent [UCL] Grivei, E. [UCL] Melinte, Sorin [UCL] Shayegan, M. [Princeton University]

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 similar to 10(5)-fold enhancement near v = 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.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 1996
Language Anglais
Journal information "Physical Review Letters" - Vol. 76, no. 24, p. 4584-4587 (1996)
Peer reviewed yes
Publisher American Physical Society
issn 0031-9007
e-issn 1079-7114
Publication status Publié
Affiliation UCL - FSA/ELEC - Département d'électricité
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Bibliographic reference Bayot, Vincent ; Grivei, E. ; Melinte, Sorin ; Shayegan, M.. Giant low temperature heat capacity of GaAs quantum wells near Landau level filling nu = 1.. In: Physical Review Letters, Vol. 76, no. 24, p. 4584-4587 (1996)
Permanent URL http://hdl.handle.net/2078.1/47133