Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-07-09
Phys. Rev. Lett. 99 (2007) 190402
Physics
Condensed Matter
Other Condensed Matter
4 pages, 3 figures (low res.), to appear in PRL
Scientific paper
10.1103/PhysRevLett.99.190402
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).
Carretero-González Ricardo
Frantzeskakis Dimitri J.
Hall David S.
Kevrekidis Panagiotis G.
Merrill J.
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