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MAGNETIC FIELD INDUCED INSTABILITIES IN LOCALIZED TWO-DIMENSIONAL ELECTRON SYSTEMS

Baenninger, M; Ghosh, A; Pepper, M; Beere, HE; Farrer, I; Ritchie, DA; (2009) MAGNETIC FIELD INDUCED INSTABILITIES IN LOCALIZED TWO-DIMENSIONAL ELECTRON SYSTEMS. In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. (pp. 2708 - 2712). WORLD SCIENTIFIC PUBL CO PTE LTD

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Abstract

The results of extensive transport studies in localized regime of mesoscopic two-dimensional electron systems (2DES) with varying disorder are presented. A quick overview of previously achieved result is given. The main focus is on the observation of density dependent instabilities manifested by strong resistance oscillations induced by high perpendicular magnetic fields B-perpendicular to. While the amplitude of the oscillations is strongly enhanced with increasing B-perpendicular to, their position in electron density remains unaffected. The temperature dependence of resistivity shows a transition from an activated behaviour at high temperature to a saturated behaviour at low T. In the positions of resistance minima, the T dependence can even become metal-like (d rho/dT > 0). The activation energies obtained from the high T behaviour exhibit a formation of plateaux in connection with the resistance oscillations when analyzed as a function of electron density. We suggest the interplay between a strongly interacting electron phase and the background disorder as a possible explanation for our observation.

Type:Proceedings paper
Title:MAGNETIC FIELD INDUCED INSTABILITIES IN LOCALIZED TWO-DIMENSIONAL ELECTRON SYSTEMS
Event:18th International Conference on High Magnetic Fields in Semiconductor Physics and Nanotechnology
Location:Sao Pedro, BRAZIL
Dates:2008-08-03 - 2008-08-08
Keywords:Two-dimensional electron systems, disorder, localization, electron-electron interactions, magnetic field, MAGNETORESISTANCE
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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