Name of the Journal:
Physical Review Letters
Date of Pub:
June 23, 1997
Year of Publication:
1997
Volume:
78
Issue:
25
Pages:
4825-4828
Publisher Name, Address and Year:
American Physical Society
Abstract:
At Landau level filling factors near ν=1, quantum Hall ferromagnets form a Skyrme crystal state with quasi-long-range translational and noncollinear magnetic order. We develop an effective low energy theory which explains the presence of magnetic excitations in these systems at energies below the Larmor gap ( Δ) and that predicts a dramatic enhancement of the nuclear spin relaxation rate by a factor of 103. 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−ν−Δ Skyrme crystal phase diagram.
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