Giant Low Temperature Heat Capacity of GaAs Quantum Wells near Landau Level Fillingν=1

V. Bayot, E. Grivei, S. Melinte, M. B. Santos, M. Shayegan
1996 Physical Review Letters  
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 10^5-fold enhancement near ν=1 where Skyrmions arethe 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
more » ... s, except at very low T where C vs T exhibits a remarkably sharp peak suggestive of a phase transition in the electronic system.
doi:10.1103/physrevlett.76.4584 pmid:10061328 fatcat:cw2m5te57bc4dng2wlshvh4y3i