How to STIRAP a vortex
G. Nandi, R. Walser, and W. P. Schleich
TL;DR
This paper proposes a method to create superfluid vortices in Bose-Einstein condensates using STIRAP with laser pulses, demonstrating high transfer efficiency and analyzing excitations and spectrum.
Contribution
It introduces a novel optical scheme for vortex creation in BECs via STIRAP, with detailed numerical and analytical analysis of the process and excitations.
Findings
High transfer efficiency of angular momentum demonstrated
Residual excitations and breathing modes analyzed
Bogoliubov spectrum of excitations presented
Abstract
We examine a scheme for the optical creation of a superfluid vortex in a trapped Bose-Einstein condensate (BEC), using the stimulated Raman adiabatic passage (STIRAP) technique. 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 . 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) which occur in the two-dimensional regime and present the Bogoliubov excitation spectrum.
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Taxonomy
TopicsCold Atom Physics and Bose-Einstein Condensates · Quantum Information and Cryptography · Quantum optics and atomic interactions