Nonequilibrium Dynamics and Superfluid Ring Excitations in Binary Bose-Einstein Condensates
| Autor: | Dimitrios J. Frantzeskakis, David Hall, Panayotis G. Kevrekidis, K. M. Mertes, Jason W. Merrill, Ricardo Carretero-González |
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| Rok vydání: | 2007 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Condensed matter physics FOS: Physical sciences General Physics and Astronomy Binary number Non-equilibrium thermodynamics 01 natural sciences 3. Good health 010305 fluids & plasmas law.invention Condensed Matter - Other Condensed Matter Superfluidity Mean field theory law 0103 physical sciences Quasiparticle 010306 general physics Hyperfine structure Bose–Einstein condensate Excitation Other Condensed Matter (cond-mat.other) |
| Zdroj: | Physical Review Letters. 99 |
| ISSN: | 1079-7114 0031-9007 |
| Popis: | We revisit a classic study [D. S. Hall {\it et al.}, Phys. Rev. Lett. {\bf 81}, 1539 (1998)] of interpenetrating Bose-Einstein condensates in the hyperfine states $\ket{F = 1, m_f = -1}\equiv\ket{1}$ and $\ket{F = 2, m_f = +1}\equiv\ket{2}$ of ${}^{87}$Rb and observe striking new non-equilibrium component separation dynamics in the form of oscillating ring-like structures. The process of component separation is not significantly damped, a finding that also contrasts sharply with earlier experimental work, allowing a clean first look at a collective excitation of a binary superfluid. We further demonstrate extraordinary quantitative agreement between theoretical and experimental results using a multi-component mean-field model with key additional features: the inclusion of atomic losses and the careful characterization of trap potentials (at the level of a fraction of a percent). 4 pages, 3 figures (low res.), to appear in PRL |
| Databáze: | OpenAIRE |
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