Polaron in Bose-Einstein-Condensation System

G. E. Astrakharchik, Luis A. Peña Ardila, Richard Schmidt +2 more

Wim Casteels, Jacques Tempere, J. T. Devreese

Alina Blinova, M. G. Boshier, Eddy Timmermans

Sh. Mardonov, Bobomurat J. Ahmedov, Eugene Ya. Sherman

Michael Hohmann, Farina Kindermann, Benjamin Gänger +4 more

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.

Huang Bei-Bing, Shaolong Wan

We consider the motion of an impurity in a Bose–Einstein condensate system at T = 0 K with the contact interactions for boson-boson and boson-impurity. Under the forward-scattering approximation, we obtain a Fröhlich-like Hamiltonian for this system, which means that a polaron can be formed. The effective mass, the phonon number and the energy to form a polaron are obtained. We also discuss the validity of the forward-scattering approximation for this system.