Hannover 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.7: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Evolution of Bose-Einstein condensates in a gravitational cavity — •Javed Akram1 and Axel Pelster2 — 1Fachbereich Physik, Freie Universität Berlin, Germany — 2Fachbereich Physik, Technische Universität Kaiserslautern, Germany
We investigate both the static and dynamic properties of weakly interacting Bose-Einstein condensates (BEC) in an one-dimensional gravitational cavity. There the effect of gravity is compensated by an exponentially decaying potential, which is created by the total internal reflection of an incident laser beam from the surface of a dielectric serving as a mirror for the atoms. By solving the underlying Gross-Pitaevskii equation with a variational Gaussian condensate wave function, we derive a coupled set of differential equations for the width and the height of the condensate. By considering small deflections around the respective equilibrium positions, we determine the collective excitations of the BEC. Furthermore, we analyze how the BEC cloud expands ballistically due to gravity after switching off the evanescent laser field.