Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 31: Ultracold atoms, ions and BEC III (with A)
Q 31.1: Invited Talk
Wednesday, March 19, 2014, 14:00–14:30, UDL HS3038
Single charged impurities inside a Bose-Einstein condensate — •Sebastian Hofferberth1, Jonathan Balewski1, Alexander Krupp1, Anita Gaj1, David Peter2, Hanspeter Büchler2, Robert Löw1, and Tilman Pfau1 — 15. Phys. Institut, Universität Stuttgart, Germany — 2Institut für Theoretische Physik III, Universität Stuttgart, Germany
We investigate the interaction of single charged impurtities with a Bose-Einstein condensate (BEC). We produce these impurities by exciting exactly one atom from the BEC to a Rydberg state. Since the ionic core and the Rydberg electron have vastly different mass and interaction range with the surrounding ground state atoms, their effect on the BEC can be observed separately. For low-L Rydberg states, the electron wavefunction is fully immersed in the BEC, and we observe electron-phonon coupling. We show that a single electron excites collective modes of the whole condensate. We also discuss the feasibility of studying the interaction of the ionic core with the BEC, which becomes possible if the electron is excited to a high-L states such that it is moved completely outside of the BEC. In this situation one could study ion-ground state Feshbach resonances at very low temperatures or trap the ion inside the BEC without any external electric fields.