Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 15: Ultracold atoms and BEC - III (with Q)
A 15.7: Talk
Tuesday, March 7, 2017, 16:00–16:15, N 1
Rotation of cold molecular ions inside a Bose-Einstein condensate — •Bikashkali Midya1, Michal Tomza2, Richard Schmidt3, and Mikhail Lemeshko1 — 1Institute of Science and Technology Austria, Am Campus 1, 3400 Klosterneuburg, Austria — 2ICFO- The Barcelona Ins titute of Science and Technology, Barcelona, Spain — 3ITAMP, Havard-Smithsonian Center for Astrophysics, Cambr idge, MA 02138, USA
We use recently developed angulon theory [1] to study the rotational spectrum of a cyanide molecular anion immersed into Bose-Einstein condensates of rubidium and strontium. Based on ab initio potential energy surfaces, we provide a detailed study of the rotational Lamb shift and many-body-induced fine structure which arise due to dressing of molecular rotation by a field of phonon excitations. We demonstrate that the magnitude of these effects is large enough in order to be observed in modern experiments on cold molecular ions. Furthermore, we introduce a novel method to construct pseudopotentials starting from the ab initio potential energy surfaces, which provides a means to obtain effective coupling constants for low-energy polaron models.
[1] R. Schmidt and M. Lemeshko, Phys. Rev. Lett. 114, 203001 (2015).
[2] B. Midya, M. Tomza, R. Schmidt, M. Lemeshko, Phys. Rev. A 94, 041601(R) (2016).