Topological defects in mixtures of superconducting condensates with different charges
2014 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 89, no 21, 214507- p.Article in journal (Refereed) Published
We investigate the topological defects in phenomenological models describing mixtures of charged condensates with commensurate electric charges. Such situations are expected to appear for example in liquid metallic deuterium. This is modeled by a multicomponent Ginzburg-Landau theory where the condensates are coupled to the same gauge field by different coupling constants whose ratio is a rational number. We also briefly discuss the case where electric charges are incommensurate. Flux quantization and finiteness of the energy per unit length dictate that the different condensates have different winding and thus different number of (fractional) vortices. Competing attractive and repulsive interactions lead to molecule-like bound states between fractional vortices. Such bound states have finite energy and carry integer flux quanta. These can be characterized by the CP1 topological invariant that motivates their denomination as skyrmions.
Place, publisher, year, edition, pages
2014. Vol. 89, no 21, 214507- p.
Liquid Metallic Deuterium, Vortices, Hydrogen
IdentifiersURN: urn:nbn:se:kth:diva-148288DOI: 10.1103/PhysRevB.89.214507ISI: 000338510100003ScopusID: 2-s2.0-84903528073OAI: oai:DiVA.org:kth-148288DiVA: diva2:736571
FunderSwedish Research CouncilKnut and Alice Wallenberg Foundation
QC 201408072014-08-072014-08-052014-08-07Bibliographically approved