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Scanning SQUID Study of Vortex Manipulation by Local Contact

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Superconducting vortices in semilocal models.

Péter Forgács¹, Sébastien Reuillon, Mikhail S Volkov

¹Laboratoire de Mathématiques et Physique Théorique CNRS-UMR 6083, Université de Tours Parc de Grandmont, 37200 Tours, France.

Physical Review Letters

|February 21, 2006

Summary

Researchers discovered new straight string solutions in the SU(2) semilocal model. These solutions, which carry a persistent current, represent a deformed Abrikosov-Nielsen-Olesen vortex with finite energy, offering potential applications in physics.

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Area of Science:

Theoretical Physics
High Energy Physics
Condensed Matter Physics

Background:

The SU(2) semilocal model, a variant of the Abelian Higgs model, is crucial for understanding topological defects.
Abrikosov-Nielsen-Olesen (ANO) vortices are well-studied topological defects with finite energy.
Investigating modifications to these vortices can reveal new physical phenomena.

Purpose of the Study:

To identify and characterize new classes of string solutions within the SU(2) semilocal model.
To explore the properties of these solutions, particularly concerning persistent currents and energy.
To compare these new solutions with existing ANO vortices.

Main Methods:

Analysis of the SU(2) semilocal model equations.
Identification of stationary and static string solutions.
Mathematical investigation of vortex deformation by electric currents.

Main Results:

A new class of stationary, straight string solutions with finite energy per unit length was found.
These solutions represent a nontrivial deformation of ANO vortices due to a flowing current.
The new static vortex solutions exhibit lower energy compared to standard ANO vortices.

Conclusions:

The discovered solutions bifurcate from ANO vortices as the current diminishes.
Stationary solutions generate electric fields and angular momentum while maintaining finite energy.
These novel vortex solutions hold significant potential for diverse physical systems, including condensed matter and cosmic strings.