Nonequilibrium Dynamics and Superfluid Ring Excitations in Binary Bose-Einstein Condensates

K. M. Mertes, J. W. Merrill, R. Carretero-González, D. J. Frantzeskakis, P. G. Kevrekidis, and D. S. Hall
Phys. Rev. Lett. 99, 190402 – Published 5 November 2007
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We revisit a classic study [D. S. Hall et al., Phys. Rev. Lett. 81, 1539 (1998)] of interpenetrating Bose-Einstein condensates in the hyperfine states |F=1,mf=1|1 and |F=2,mf=+1|2 of Rb87 and observe striking new nonequilibrium component separation dynamics in the form of oscillating ringlike 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 multicomponent 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).

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  • Received 9 July 2007


©2007 American Physical Society

Authors & Affiliations

K. M. Mertes1,*, J. W. Merrill1,†, R. Carretero-González2, D. J. Frantzeskakis3, P. G. Kevrekidis4, and D. S. Hall1

  • 1Department of Physics, Amherst College, Amherst, Massachusetts 01002-5000, USA
  • 2Nonlinear Dynamical Systems Group, Department of Mathematics and Statistics, and Computational Science Research Center, San Diego State University, San Diego, California 92182-7720, USA
  • 3Department of Physics, University of Athens, Panepistimiopolis, Zografos, Athens 157 84, Greece
  • 4Department of Mathematics and Statistics, University of Massachusetts, Amherst, Massachusetts 01003-4515, USA

  • *Current address: Los Alamos National Laboratory, MS-J567, Los Alamos, NM 87545, USA.
  • Current address: Department of Physics, Yale University, New Haven, CT 06520-8120, USA.

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Vol. 99, Iss. 19 — 9 November 2007

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