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Hysteresis and first-order phase transition in the two-dimensional electron gas

DOI to cite this document:
Piazza, Vincenzo ; Pellegrini, Vittorio ; Beltram, Fabio ; Wegscheider, Werner ; Bichler, Max ; Jungwirth, Tomás ; McDonald, Allan H.
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Date of publication of this fulltext: 30 Nov 2009 13:20


We report experimental evidence of the first-order phase transitions in the two-dimensional electron gas formed in a gated wide GaAs/AlGaAs quantum well at even-integer quantum-Hall states. At the filling factor values of ν=2,4 and low temperatures, crossing of Landau levels through the application of the gate bias yields a suppression of the quantum-Hall-state excitation gap and hysteretical ...


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