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Metastable phase in the quantum Hall ferromagnet

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arxiv cond-mat/0207234 v2 pith:BOANXDSP submitted 2002-07-09 cond-mat.mes-hall cond-mat.str-el

Metastable phase in the quantum Hall ferromagnet

Vincenzo Piazza (1) , Vittorio Pellegrini (1) , Fabio Beltram (1) , Werner Wegscheider (2 , 3) ((1) NEST-INFM , Scuola Normale Superiore , Pisa , Italy
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(2) Walter Schottky Institut Technische Universitat Munchen Garching Germany (3) Institut fur Experimentelle und Angewandte Physik Universitat Regensburg Regensburg Germany)
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classification cond-mat.mes-hall cond-mat.str-el
keywords phasegatemagneticmetastablequantumrelaxationtemperaturevoltage
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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.

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