Piazza, Vincenzo and Pellegrini, Vittorio and Beltram, Fabio and Wegscheider, Werner (2003) Metastable phase in the quantum Hall ferromagnet. Solid State Communications 127 (2), pp. 163-168.
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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 behaviour and correlates with hysteresis loops observed by sweeping the magnetic field. These experiments indicate that metastable randomly distributed magnetic domains with peculiar excitations are involved in the relaxation process in a way that is equivalently tunable by a change in gate voltage or temperature.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|Keywords:||A. Bilayer system; D. Quantum Hall; D. Quantum phase transition; D. Metastable phase|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||15 Dec 2009 08:52|
|Last Modified:||05 Feb 2010 13:02|