Time-dependent capacitance measurements reveal an unstable phase of electrons in gallium arsenide quantum well that occurs when two Landau levels with opposite spin are brought close to degeneracy by applying a gate voltage. This phase emerges below a critical temperature and displays a peculiar non-equilibrium dynamical evolution. The relaxation dynamics is found to follow a stretched exponential behavior and correlates with hysteresis loops observed by sweeping the magnetic field. These experiments indicate that metastable randomly-distributed magnetic domains are involved in the relaxation process in a way that is equivalently tunable by a change in gate voltage or temperature.
@article{arxiv.cond-mat/0207234,
title = {Metastable phase in the quantum Hall ferromagnet},
author = {Vincenzo Piazza and Vittorio Pellegrini and Fabio Beltram and Werner Wegscheider},
journal= {arXiv preprint arXiv:cond-mat/0207234},
year = {2009}
}
Comments
7 pages, including 4 figures Changes made to introduction Added figure Submitted to SSC