Frankfurt 2006 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 38: Quantengase IV

Q 38.2: Vortrag

Mittwoch, 15. März 2006, 10:55–11:10, HVI

Collective resonance scattering from trapped BEC — •Michael Grupp, Gerrit Nandi, Reinhold Walser, and Wolfgang P. Schleich — Abteilung Quantenphysik, Universität Ulm

Two-particle Feshbach resonances have gained tremendous importance in degenerate gases, as it becomes possible to actively control the mutual interaction between particles.

Moreover, in this contribution we consider Feshbach resonances as a collective phenomenon in a mesoscopic or even macroscopic BEC. We examined the collective scattering of a superfluid droplet impinging on a two-component BEC trapped by two finite-depth external potentials. Quasi-bound excitations embedded in the scattering continuum yield collective Feshbach resonances of the BEC. For weak perturbations we have computed the transmission spectrum by the linear response theory introduced by Bogoliubov.

[1] M. Grupp, G. Nandi, R. Walser, W. P. Schleich, cond-mat/0510734

[2] U. Poulsen, K. Mølmer, Phys. Rev. A 67, 13610(2003)

[3] J. Brand, I. Häring, J. Rost, Phys. Rev. Lett. 91, 070403(2003)