Creation of a Dirac monopole-antimonopole pair in a spin-1 Bose-Einstein condensate

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http://hdl.handle.net/10138/308452

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Tiurev , K , Kuopanportti , P & Möttönen , M 2019 , ' Creation of a Dirac monopole-antimonopole pair in a spin-1 Bose-Einstein condensate ' , Physical Review A , vol. 99 , no. 2 , 023621 . https://doi.org/10.1103/PhysRevA.99.023621

Julkaisun nimi: Creation of a Dirac monopole-antimonopole pair in a spin-1 Bose-Einstein condensate
Tekijä: Tiurev, Konstantin; Kuopanportti, Pekko; Möttönen, Mikko
Muu tekijä: University of Helsinki, Materials Physics
Päiväys: 2019-02-19
Kieli: eng
Sivumäärä: 7
Kuuluu julkaisusarjaan: Physical Review A
ISSN: 2469-9926
URI: http://hdl.handle.net/10138/308452
Tiivistelmä: We theoretically demonstrate that a pair of Dirac monopoles with opposite synthetic charges can be created within a single spin-1 Bose-Einstein condensate by steering the spin degrees of freedom by external magnetic fields. Although the net synthetic magnetic charge of this configuration vanishes, both the monopole and the antimonopole are accompanied by vortex filaments carrying opposite angular momenta. Such a Dirac dipole can be realized experimentally by imprinting a spin texture with a nonlinear magnetic field generated by a pair of coils in a modified Helmholtz configuration. We also investigate the case where the initial state for the dipole-creation procedure is pierced by a quantized vortex line with a winding number kappa. It is shown that if kappa = -1, the resulting monopole and antimonopole lie along the core of a singly quantized vortex whose sign is reversed at the locations of the monopoles. For kappa = -2, the monopole and antimonopole are connected by a vortex line segment carrying two quanta of angular momentum, and hence the dipole as a whole is an isolated configuration. In addition, we simulate the long-time evolution of the dipoles in the magnetic field used to create them. For kappa = 0, each of the semi-infinite doubly quantized vortices splits into two singly quantized vortices, as in the case of a single Dirac monopole. For kappa = -1 and kappa = -2, the initial vortices deform into a vortex with a kink and a vortex ring, respectively.
Avainsanat: HIGHLY IONIZING PARTICLES
MAGNETIC MONOPOLES
SEARCH
COLLISIONS
FIELD
114 Physical sciences
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