Magnetic field induced instabilities in localized Two-dimensional Electron Systems

Baenninger, Matthias ; Ghosh, Arindam ; Pepper, Michael ; Beere., Harvey E.. ; Farrer, Ian ; Ritchie, David A. (2009) Magnetic field induced instabilities in localized Two-dimensional Electron Systems International Journal of Modern Physics B, 23 (12-13). pp. 2708-2712. ISSN 0217-9792

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Official URL: http://www.worldscientific.com/doi/abs/10.1142/S02...

Related URL: http://dx.doi.org/10.1142/S0217979209062232

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.

Item Type:Article
Source:Copyright of this article belongs to World Scientific Publishing.
Keywords:Two-dimensional Electron Systems; Disorder; Localization; Electron-Electron Interactions; Magnetic Field
ID Code:101556
Deposited On:01 Feb 2018 10:07
Last Modified:01 Feb 2018 10:07

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