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Vortices carrying an arbitrary fraction of magnetic flux quantum, neutral superfluidity and knotted solitons in two-gap Ginzburg-Landau model
2004 (English)In: Physica. C, Superconductivity, ISSN 0921-4534, E-ISSN 1873-2143, Vol. 404, no 04-jan, 39-43 p.Article in journal (Refereed) Published
Abstract [en]

We show that in two-gap superconductors there exist vortices which carry an arbitrary fraction of magnetic flux quantum and in two dimensions under certain conditions these vortices undergo a BKT transition which marks onset of quasi-long-range order only in a difference of phases of the two order parameters. In the second part of the talk we show that an U(1) x U(1) Ginzburg-Landau model or a GL model where U(1) x U(1) symmetry is weakly broken to U(1) is exactly equivalent to a version of the Faddeev's the nonlinear O(3) sigma model. This implies in particular that such a system possesses a hidden O(3) symmetry and besides that allows for the formation of knotted solitons. The second part of the talk is based on a joint work with L.D. Faddeev and A. Niem: Phys. Rev. B 65 (2002) 100512.

Place, publisher, year, edition, pages
2004. Vol. 404, no 04-jan, 39-43 p.
Keyword [en]
two-gap superconductivity, Ginzburg-Landau model, magnetic flux, superfluidity, classical field-theory, superconducting films, phase fluctuations, number
Identifiers
URN: urn:nbn:se:kth:diva-23381ISI: 000221211500009OAI: oai:DiVA.org:kth-23381DiVA: diva2:342079
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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