Τίτλος:
Vortex precession dynamics in general radially symmetric potential traps in two-dimensional atomic Bose-Einstein condensates
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We consider the motion of individual two-dimensional vortices in general radially symmetric potentials in Bose-Einstein condensates. We find that although in the special case of the parabolic trap there is a logarithmic correction in the dependence of the precession frequency ω on the chemical potential μ, this is no longer true for a general potential V(r)rp. Our calculations suggest that for p>2, the precession frequency scales with μ as ω∼μ-2/p. This theoretical prediction is corroborated by numerical computations, not only at the level of spectral (Bogolyubov-de Gennes) stability analysis by identifying the relevant precession mode dependence on μ but also through direct numerical computations of the vortex evolution in the large-μ, so-called Thomas-Fermi, limit. Additionally, the dependence of the precession frequency on the distance to the trap center of an initially displaced vortex is examined, and the corresponding predictions are tested against numerical results. © 2017 American Physical Society.
Συγγραφείς:
Kevrekidis, P.G.
Wang, W.
Carretero-González, R.
Frantzeskakis, D.J.
Xie, S.
Περιοδικό:
Physical Review A
Εκδότης:
American Physical Society
Λέξεις-κλειδιά:
Bose-Einstein condensation; Statistical mechanics, Atomic Bose-Einstein condensate; Bose-Einstein condensates; Logarithmic corrections; Motion of individual; Numerical computations; Precession frequency; Stability analysis; Vortex precessions, Vortex flow
DOI:
10.1103/PhysRevA.96.043612
