# Heidelberg 2015 – wissenschaftliches Programm

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# Q: Fachverband Quantenoptik und Photonik

## Q 15: Poster: Quantum Optics and Photonics I

### Q 15.9: Poster

### Montag, 23. März 2015, 17:00–19:00, C/Foyer

**Bose-Einstein condensate in contact with an environment** — •Alexander Schäbe and Corinna Kollath — Helmholtz-Institut für Strahlen- und Kernphysik, Nussallee 14-16, D-53115 Bonn

A famous feature of bosons is the formation of a condensate at low temperatures. Bose- Einstein condensates are used to investigate effects like phase transitions or its excitations e.g. solitons, vortices and breathing modes. Since there is a variety of excitations of the condensate, it is a research field of great interest.

In the experimental setups, typically, effects of the coupling to the environment need to be taken into account. These can be e.g. atom loss events or heating effects. We investigate such environmental effects onto a BEC. A condensate can be generally described by the solution of the Gross-Pitaevskii (GP) equation which takes a trapping potential and the interaction of the bosons into account. Further, the GP equation can be modified in order to include the loss of atoms. By a numerical treatment of such a system, we will study all the dynamics and consequences, which are induced by dissipation.