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Quantum and classical surface-acoustic-wave-induced magnetoresistance oscillations in a two-dimensional electron gas

Kennett, M. P. and Robinson, John P. and Cooper, N. R. and Falko, Vladimir I. (2005) Quantum and classical surface-acoustic-wave-induced magnetoresistance oscillations in a two-dimensional electron gas. Physical Review D, 71 (19). p. 195420. ISSN 1550-7998

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Abstract

We study theoretically the geometrical and temporal commensurability oscillations induced in the resistivity of two-dimensional electrons in a perpendicular magnetic field by surface acoustic waves (SAWs). We show that there is a positive anisotropic dynamical classical contribution and an isotropic nonequilibrium quantum contribution to the resistivity. We describe how the commensurability oscillations modulate the resonances in the SAW-induced resistivity at multiples of the cyclotron frequency. We study the effects of both short-range and long-range disorder on the resistivity corrections for both the classical and quantum nonequilibrium cases. We predict that the quantum correction will give rise to zero-resistance states with associated geometrical commensurability oscillations at large SAW amplitude for sufficiently large inelastic scattering times. These zero resistance states are qualitatively similar to those observed under microwave illumination, and their nature depends crucially on whether the disorder is short or long range. Finally, we discuss the implications of our results for current and future experiments on two-dimensional electron gases.

Item Type: Article
Journal or Publication Title: Physical Review D
Uncontrolled Keywords: two-dimensional electron gas ; surface acoustic waves ; magnetoresistance ; acoustoelectric effects ; cyclotron resonance
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 9676
Deposited By: Ms Margaret Calder
Deposited On: 18 Jun 2008 16:25
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9676

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