Quantum Hall Ferromagnetism in a Two-Dimensional Electron System

Details Quantum Hall Ferromagnetism in a Two-Dimensional Electron System Quantum Hall Ferromagnetism in a Two-Dimensional Electron System

2000-11-06

arxiv.org/abs/cond-mat/0011081v1

Science 289, 2320 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 5 figures

Scientific paper

10.1126/science.289.5488.2320

Experiments on a nearly spin degenerate two-dimensional electron system reveals unusual hysteretic and relaxational transport in the fractional quantum Hall effect regime. The transition between the spin-polarized (with fill fraction $\nu = 1/3$) and spin-unpolarized ($\nu = 2/5$) states is accompanied by a complicated series of hysteresis loops reminiscent of a classical ferromagnet. In correlation with the hysteresis, magnetoresistance can either grow or decay logarithmically in time with remarkable persistence and does not saturate. In contrast to the established models of relaxation, the relaxation rate exhibits an anomalous divergence as temperature is reduced. These results indicate the presence of novel two-dimensional ferromagnetism with a complicated magnetic domain dynamic.

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