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2 results on '"Spirn, D."'

1. Exploring Vortex Dynamics in the Presence of Dissipation: Analytical and Numerical Results

Author

Yan, D., Carretero-González, R., Frantzeskakis, D. J., Kevrekidis, P. G., Proukakis, N. P., and Spirn, D.

Subjects
Condensed Matter - Quantum Gases
Abstract

In this paper, we systematically examine the stability and dynamics of vortices under the effect of a phenomenological dissipation used as a simplified model for the inclusion of the effect of finite temperatures in atomic Bose-Einstein condensates. An advantage of this simplified model is that it enables an analytical prediction that can be compared directly (and favorably) to numerical results. We then extend considerations to a case of considerable recent experimental interest, namely that of a vortex dipole and observe good agreement between theory and numerical computations in both the stability properties (eigenvalues of the vortex dipole stationary states) and the dynamical evolution of such configurations., Comment: 12 pages, 5 figures, accepted by PRA

Published
2013
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2. Exploring vortex dynamics in the presence of dissipation: Analytical and numerical results

Author

Yan, D. Carretero-González, R. Frantzeskakis, D.J. Kevrekidis, P.G. Proukakis, N.P. Spirn, D.

Subjects
Condensed Matter::Quantum Gases
Abstract

In this paper, we examine the dynamical properties of vortices in atomic Bose-Einstein condensates in the presence of phenomenological dissipation, used as a basic model for the effect of finite temperatures. In the context of this so-called dissipative Gross-Pitaevskii model, we derive analytical results for the motion of single vortices and, importantly, for vortex dipoles, which have become very relevant experimentally. Our analytical results are shown to compare favorably to the full numerical solution of the dissipative Gross-Pitaevskii equation where appropriate. We also present results on the stability of vortices and vortex dipoles, revealing good agreement between numerical and analytical results for the internal excitation eigenfrequencies, which extends even beyond the regime of validity of this equation for cold atoms. © 2014 American Physical Society.

Published
2014

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