Generating ring currents, solitons and svortices by stirring a Bose-Einstein condensate in a toroidal trap
| Autor: | William P. Reinhardt, Joachim Brand |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Toroid Winding number FOS: Physical sciences Torus Observable Condensed Matter - Soft Condensed Matter Condensed Matter Physics Atomic and Molecular Physics and Optics law.invention Vortex law Quantum electrodynamics Soft Condensed Matter (cond-mat.soft) Adiabatic process Bose–Einstein condensate Ring current |
| Zdroj: | Journal of Physics B: Atomic, Molecular and Optical Physics. 34:L113-L119 |
| ISSN: | 1361-6455 0953-4075 |
| DOI: | 10.1088/0953-4075/34/4/105 |
| Popis: | We propose a simple stirring experiment to generate quantized ring currents and solitary excitations in Bose-Einstein condensates in a toroidal trap geometry. Simulations of the 3D Gross-Pitaevskii equation show that pure ring current states can be generated efficiently by adiabatic manipulation of the condensate, which can be realized on experimental time scales. This is illustrated by simulated generation of a ring current with winding number two. While solitons can be generated in quasi-1D tori, we show the even more robust generation of hybrid, solitonic vortices (svortices) in a regime of wider confinement. Svortices are vortices confined to essentially one-dimensional dynamics, which obey a similar phase-offset--velocity relationship as solitons. Marking the transition between solitons and vortices, svortices are a distinct class of symmetry-breaking stationary and uniformly rotating excited solutions of the 2D and 3D Gross-Pitaevskii equation in a toroidal trapping potential. Svortices should be observable in dilute-gas experiments. 8 pages, 4 figures; accepted for publication in J. Phys. B (Letters) |
| Databáze: | OpenAIRE |
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