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Q: Quantenoptik und Photonik

Q 18: Quantengase II

Q 18.1: Vortrag

Dienstag, 23. März 2004, 11:00–11:15, HS 225

How to STIRAP a vortex — •Gerrit Nandi, Reinhold Walser, and Wolfgang P. Schleich — Abteilung für Quantenphysik, Universität Ulm, Germany

We examine an alternative scheme for the optical creation of a superfluid vortex in a trapped Bose-Einstein condensate ([2],[3]), using the stimulated Raman adiabatic passage (STIRAP) technique [1]. By exposing an oblate, axis-symmetric condensate to two co-propagating laser pulses, one can transfer external angular momentum from the light field to the matter wave, if one of the beams is the fundamental Gaussian mode and the other is a Gauss-Laguerre mode of angular momentum m=1. We demonstrate the complete transfer efficiency by numerical integration of the multi-component Gross-Pitaevskii equation and explain the results with an intuitive and accurate approximation within the Thomas-Fermi limit. In addition, we discuss residual excitations (breathing modes [4]) that occur in the 2D regime and present the Bogoliubov excitation spectrum.

[1] K. Bergmann, H. Theuer and B.W. Shore, Rev. Mod. Phys. 70, 3 (1998)

[2] K.-P. Marzlin, W. Zhang and E. M. Wright, Phys. Rev. Lett. 79, 4728 (1997)

[3] R. Dum, J. I. Cirac, M. Lewenstein and P. Zoller, Phys. Rev. Lett. 80, 2972 (1998)

[4] L. P. Pitaevskii and A. Rosch, Phys. Rev. A. 55, R853 (1997)