Unbinding of Giant Vortices in States of Competing Order

Carr, S.T. and Fellows, Jonathan M. and Hooley, Christopher A. and Schmalian, Jorg (2012) Unbinding of Giant Vortices in States of Competing Order. Physical Review Letters: Moving Physics Forward, 109 (15). p. 155703. ISSN 0031-9007. (doi:https://doi.org/10.1103/PhysRevLett.109.155703) (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://dx.doi.org/10.1103/PhysRevLett.109.155703

Abstract

We consider a two-dimensional system with two order parameters, one with O(2) symmetry and one with O(M), near a point in parameter space where they couple to become a single O(2+M) order. While the O(2) sector supports vortex excitations, these vortices must somehow disappear as the high symmetry point is approached. We develop a variational argument which shows that the size of the vortex cores diverges as 1/Δ−−√ and the Berezinskii-Kosterlitz-Thouless transition temperature of the O(2) order vanishes as 1/ln(1/Δ), where Δ denotes the distance from the high-symmetry point. Our physical picture is confirmed by a renormalization group analysis which gives further logarithmic corrections, and demonstrates full symmetry restoration within the cores.

Item Type: Article
Additional information: number of additional authors: 3; article number: 155703;
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science
Q Science > QC Physics
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Sam Carr
Date Deposited: 07 Mar 2014 00:05 UTC
Last Modified: 13 Nov 2015 15:21 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/40495 (The current URI for this page, for reference purposes)
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