Collective Excitations, NMR, and Phase Transitions in Skyrme Crystals

Details Collective Excitations, NMR, and Phase Transitions in Skyrme Crystals Collective Excitations, NMR, and Phase Transitions in Skyrme Crystals

1997-02-22

arxiv.org/abs/cond-mat/9702207v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages REVTEX file and 3 postscript figures

Scientific paper

10.1103/PhysRevLett.78.4825

At Landau level filling factors near nu =1, quantum Hall ferromagnets form a Skyrme crystal state with quasi-long-range translational and non-collinear magnetic order. We develop an effective low energy theory which explains the presence in these systems of magnetic excitations at low energies below the Larmor gap (Delta) and which predicts a dramatic enhancement of the nuclear spin relaxation rate by a factor of 1000. The effective theory predicts a rich set of quantum and classical phase transitions. Based in part on accurate time-dependent Hartree-Fock calculations of the ordered state collective excitation spectrum, we discuss aspects of the T-nu-Delta crystal phase diagram.

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