EPJ Quantum Technol. (2015) 2: 23
https://doi.org/10.1140/epjqt/s40507-015-0036-y

Research

Neutral impurities in a Bose-Einstein condensate for simulation of the Fröhlich-polaron

¹ Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Gottlieb-Daimler-Strasse 47, Kaiserslautern, 67663, Germany
² Graduate School Materials Science in Mainz, Gottlieb-Daimler-Strasse 47, Kaiserslautern, 67663, Germany

^* e-mail: mibauer@rhrk.uni-kl.de

Received: 30 July 2015
Accepted: 30 October 2015
Published online: 14 November 2015

Abstract

We present an experimental system to study the Bose polaron by immersion of single, well-controllable neutral Cs impurities into a Rb Bose-Einstein condensate (BEC). We show that, by proper optical traps, independent control over impurity and BEC allows for precision relative positioning of the two sub-systems as well as for dynamical studies and independent read-out. We furthermore estimate that measuring the polaron binding energy of Fröhlich-type Bose polarons in the low and intermediate coupling regime is feasible with our experimental constraints and limitations discussed, and we outline how a parameter regime can be reached to characterize differences between Fröhlich and Bose-polaron in the strong coupling regime.