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Magnetic Field Induced Instabilities In Localized Two-Dimensional Electron Systems

Baenninger, Matthias and Ghosh, Arindam and Pepper, Michael and Beere, Harvey E and Farrer, Ian and Ritchie, David A (2009) Magnetic Field Induced Instabilities In Localized Two-Dimensional Electron Systems. In: 18th International Conference on High Magnetic Fields in Semiconductor Physics and Nanotechnology, AUG 03-08, 2008, Sao Pedro, Brazil., pp. 2708-2712.

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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.

Item Type: Conference Paper
Publisher: World Scientific Publishing Co
Additional Information: Copyright for this proceeding paper belongs to World Scientific Publishing Co.
Keywords: Two-dimensional electron systems; disorder; localization; electron-electron interactions; magnetic field
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 04 Jan 2010 11:15
Last Modified: 19 Sep 2010 05:37
URI: http://eprints.iisc.ac.in/id/eprint/21338

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