Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy
S. Melinte, E. Grivei, V. Bayot, M. Shayegan
Abstract
Measurements on a multilayer two-dimensional electron system (2DES) near Landau level filling ν=1 reveal the disappearance of the nuclear spin contribution to the heat capacity as the ratio g between the Zeeman and Coulomb energies exceeds a critical value gc ≈0.04. This disappearance suggests the vanishing of the Skyrmion-mediated coupling between the lattice and the nuclear spins as the spin excitations of the 2DES make a transition from Skyrmions to single spin-flips above gc. Our experimental gc is smaller than the calculated gc=0.054 for an ideal 2DES; we discuss possible origins of this discrepancy.
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