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- Title
MAGNETIC FIELD INDUCED INSTABILITIES IN LOCALIZED TWO-DIMENSIONAL ELECTRON SYSTEMS.
- Authors
BAENNINGER, MATTHIAS; GHOSH, ARINDAM; PEPPER, MICHAEL; BEERE, HARVEY E.; FARRER, IAN; RITCHIE, DAVID A.
- 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⊥. While the amplitude of the oscillations is strongly enhanced with increasing B⊥, 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 (dρ/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.
- Subjects
MAGNETIC fields; TRANSPORT theory; ELECTRON distribution; OSCILLATIONS; FLUCTUATIONS (Physics)
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2009, Vol 23, Issue 12/13, p2708
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979209062232