Competitive localization of vortex lines and interacting bosons

Details Competitive localization of vortex lines and interacting bosons Competitive localization of vortex lines and interacting bosons

2005-08-24

arxiv.org/abs/cond-mat/0508576v1

Phys. Rev. Lett. 94, 077005 (2005)

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.077005

We present a theory for the localization of three-dimensional vortex lines or two-dimensional bosons with short-ranged repulsive interaction which are competing for a single columnar defect or potential well. For two vortices we use a necklace model approach to find a new kind of delocalization transition between two different states with a single bound particle. This exchange-delocalization transition is characterized by the onset of vortex exchange on the defect for sufficiently weak vortex-vortex repulsion or sufficiently weak binding energy corresponding to high temperature. We calculate the transition point and order of the exchange-delocalization transition. A generalization of this transition to arbitrary vortex number is proposed.

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