Non-Equilibrium Dynamics and Superfluid Ring Excitations in Binary Bose-Einstein Condensates

K. M. Mertes; J. Merrill; R. Carretero-Gonzalez; D. J. Frantzeskakis; P. G. Kevrekidis; D. S. Hall

doi:10.1103/PhysRevLett.99.190402

paper

Non-Equilibrium Dynamics and Superfluid Ring Excitations in Binary Bose-Einstein Condensates

arXiv:0707.1205 · doi:10.1103/PhysRevLett.99.190402

Abstract

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 $∣ F = 1, m_{f} = - 1 ⟩ \equiv ∣ 1 ⟩$ and $∣ F = 2, m_{f} = + 1 ⟩ \equiv ∣ 2 ⟩$ 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

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Spontaneous symmetry breaking in a quenched ferromagnetic spinor Bose condensate

Non-Equilibrium Dynamics and Superfluid Ring Excitations in Binary Bose-Einstein Condensates

Abstract

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