Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy

Details Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy Heat Capacity Evidence for the Suppression of Skyrmions at Large Zeeman Energy

1998-10-27

arxiv.org/abs/cond-mat/9810373v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Experimental paper, 6 figures

Scientific paper

10.1103/PhysRevLett.82.2764

Measurements on a multilayer two-dimensional electron system (2DES) near Landau level filling $\nu$=1 reveal the disappearance of the nuclear spin contribution to the heat capacity as the ratio $\tilde{g}$ between the Zeeman and Coulomb energies exceeds a critical value $\tilde{g}_c \approx$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 $\tilde{g}_c$. Our experimental $\tilde{g}_c$ is smaller than the calculated $\tilde{g}_c$=0.054 for an ideal 2DES; we discuss possible origins of this discrepancy.

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