Eur. Phys. J. Special Topics 217, 55-62 (2013)
https://doi.org/10.1140/epjst/e2013-01753-y

Regular Article

Nonequilibrium properties of an atomic quantum dot coupled to a Bose-Einstein condensate

¹ Dipartimento di Fisica “E.R. Caianiello”, Universitá degli Studi di Salerno and CNR-SPIN, Unitá Operativa di Salerno, via Ponte Don Melillo, 84084 Fisciano (SA), Italy
² Dipartimento di Fisica “E.R. Caianiello”, Universitá degli Studi di Salerno, and CNISM, Unitá di Ricerca di Salerno, via Ponte Don Melillo, 84084 Fisciano (SA), Italy

^a e-mail: citro@sa.infn.it
^b e-mail: naddeo@sa.infn.it
^c e-mail: fromeo@sa.infn.it

Received: 16 September 2012
Revised: 15 January 2013
Published online: 11 March 2013

Abstract

We study nonequilibrium properties of an atomic quantum dot (AQD) coupled to a Bose-Einstein condensate (BEC) within Keldysh-Green's function formalism when the AQD level is varied harmonically in time. Nonequilibrium features in the AQD energy absorption spectrum are the side peaks that develop as an effect of photon absorption and emission. We show that atoms can be efficiently transferred from the BEC into the AQD for the parameter regime of current experiments with cold atoms.