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

TL;DR

This paper investigates the nonequilibrium behavior of an atomic quantum dot coupled to a Bose-Einstein condensate, revealing side peaks in energy absorption and efficient atom transfer under experimental conditions.

Contribution

It introduces a theoretical analysis of the AQD-BEC system using Keldysh-Green's functions, highlighting nonequilibrium spectral features and atom transfer mechanisms.

Findings

Side peaks in energy absorption spectrum due to photon processes

Efficient atom transfer from BEC to AQD in experimental regimes

Demonstrates nonequilibrium effects in quantum dot-BEC systems

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.