Structure formation in immiscible two--species Bose--Einstein condensates in perturbed harmonic traps

ORAL

Abstract

We investigate the mean--field equilibrium solutions for a trapped two--species $^{87}$Rb--$^{133}$Cs immiscible Bose--Einstein condensate, and show that the density profiles observed in a recent Bose-Einstein experiment (D. J. McCarron \emph{et al.} Phys. Rev. A 84, 011603 (2011)), which include ball and shell formations and axially/radially separated states, can be reproduced when accounting for weak linear perturbations. We also demonstrate the importance of the coupled growth of the two condensates by a simple finite temperature model which reveals such structures to be generally metastable in the presence of dissipation, with our findings confirmed by the more accurate Stochastic Projected Gross--Pitaevskii equation.

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Authors

  • Robert Pattinson

    • Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, United-Kingdom

  • Nick Parker

    • Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, United-Kingdom

  • Nick Proukakis

    • Joint Quantum Centre Durham-Newcastle, School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, United-Kingdom

  • I-Kang Liu

    • Department of Physics, National Changhua University of Education, Changhua, Taiwan

  • Shih-Chuan Gou

    • Department of Physics, National Changhua University of Education, Changhua, Taiwan

  • Simon Gardiner

    • Joint Quantum Centre Durham-Newcastle, Department of Physics, Durham University, Durham, United-Kingdom

  • Daniel McCarron

    • Joint Quantum Centre Durham-Newcastle, Department of Physics, Durham University, Durham, United-Kingdom

  • Hung-Wen Cho

    • Joint Quantum Centre Durham-Newcastle, Department of Physics, Durham University, Durham, United-Kingdom

  • Simon Cornish

    • Joint Quantum Centre Durham-Newcastle, Department of Physics, Durham University, Durham, United-Kingdom

  • Tom Billam

    • Jack Dodd Centre for Quantum Technology, Department of Physics, University of Otago, Otago, New-Zealand