Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Posters: Quantum Optics and Photonics IV
Q 54.34: Poster
Thursday, March 12, 2020, 16:30–18:30, Empore Lichthof
Ground state and dynamics of shell-shaped BEC mixtures — •Alexander Wolf1, Matthias Meister1, Maxim A. Efremov2, and Wolfgang P. Schleich1,2 — 1Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm, Germany — 2Institut für Quantentechnologien, Deutsches Zentrum für Luft- und Raumfahrt (DLR), D-89077 Ulm, Germany
Recently, there has been great interest in the properties of hollow Bose-Einstein condensates (BECs), which are generated nowadays with radio-frequency (rf) dressing [1]. As an alternative method, we propose to realize 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 [2]. In order to obtain the main properties of this setup, in particular the width of the outer shell, we employ the Gross-Pitaevskii equation within the Thomas-Fermi approximation. Moreover, we investigate the spectrum of collective excitations with an emphasis on the transition from a filled to a hollow geometry. In the latter case, a new inner boundary appears, leading to a change of the collective mode spectrum.
This project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant number 50WP1705.
[1] Sun, K., et al., Phys. Rev. A 98, 013609 (2018)
[2] Riboli, F., et al., Phys. Rev. A 65, 063614 (2002)