Shell-shaped Bose-Einstein condensates realized with dual-species mixtures

ORAL

Abstract

Recently, there has been great interest in the properties of hollow Bose-Einstein condensates (BECs) which can be generated with radio-frequency (rf) dressing. As an alternative method, we consider the realization of hollow BECs by utilizing a dual-species mixture. A proper choice of the parameters allows us to create a ground state where one species is in the center and generates a repulsive effective potential for the second species, giving rise to a shell-shaped BEC.

In order to compare the main properties of our setup with the one based on rf-dressing, we solve both the Gross-Pitaevskii and the Bogoliubov-de Gennes equations. In particular, we investigate the free expansion dynamics and the spectrum of collective excitations. To highlight the potential of each realization, we additionally compare the deformation of the shell due to gravitational sag, being one of the main obstacles to create hollow BECs.

*This project is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) due to an enactment of the German Bundestag under the grant numbers 50WP1705 and 50WM1861-1862.

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Presenters

  • Alexander Wolf

    • Institut für Quantentechnologien, German Aerospace Center (DLR), Ulm, Germany

Authors

  • Alexander Wolf

    • Institut für Quantentechnologien, German Aerospace Center (DLR), Ulm, Germany

  • Patrick B Boegel

    • Institut für Quantenphysik, Ulm University, Ulm, Germany
    • Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, Ulm, Germany

  • Naceur Gaaloul

    • Leibniz University Hannover, Institute of Quantum Optics
    • Univ Hannover
    • Institut für Quantenoptik, Leibniz University Hannover, Hannover, Germany
    • Leibniz University Hannover
    • Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany

  • Matthias Meister

    • Institut für Quantentechnologien, German Aerospace Center (DLR), Ulm, Germany
    • Institute of Quantum Technologies, German Aerospace Center (DLR), Ulm, Germany
    • Institut für Quantentechnologien, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Ulm, Germany
    • Institute of Quantum Technologies, German Aerospace Center

  • Maxim Efremov

    • Institut für Quantentechnologien, German Aerospace Center (DLR), Ulm, Germany
    • Institute of Quantum Technologies, German Aerospace Center (DLR), D-89069 Ulm, Germany
    • Institute of Quantum Technologies, German Aerospace Center (DLR), D-89077 Ulm, Germany