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.
![]() |
PDF
full_text_ii.pdf - Published Version Restricted to Registered users only Download (474kB) | Request a copy |
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.
Item Type: | Conference Paper |
---|---|
Publication: | INTERNATIONAL JOURNAL OF MODERN PHYSICS B |
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 |
Actions (login required)
![]() |
View Item |