Weak localization and magnetoresistance in a two-leg ladder model

Schneider, M.P. and Carr, S.T. and Gornyi, I.V. and Mirlin, A.D. (2012) Weak localization and magnetoresistance in a two-leg ladder model. Physical Review B - condensed matter and materials physics, 86 (15). pp. 155141-155158. ISSN 1098-0121. (doi:https://doi.org/10.1103/PhysRevB.86.155141) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://www.dx.doi.org/10.1103/PhysRevB.86.155141

Abstract

We analyze the weak-localization correction to the conductivity of a spinless two-leg ladder model in the limit of strong dephasing τ φτ tr,, paying particular attention to the presence of a magnetic field, which leads to an unconventional magnetoresistance behavior. We find that the magnetic field leads to three different effects: (i) negative magnetoresistance due to the regular weak-localization correction, (ii) effective decoupling of the two chains, leading to positive magnetoresistance, and (iii) oscillations in the magnetoresistance originating from the nature of the low-energy collective excitations. All three effects can be observed depending on the parameter range, but it turns out that large magnetic fields always decouple the chains and thus lead to the curious effect of magnetic-field-enhanced localization.

Item Type: Article
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Sam Carr
Date Deposited: 22 Jul 2015 08:17 UTC
Last Modified: 13 Nov 2015 15:22 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/49626 (The current URI for this page, for reference purposes)
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