Topological Atom Laser

TL;DR

This paper demonstrates a topological atom laser by output coupling a vortex state using Raman scattering, providing analytic solutions and numerical simulations to analyze the output beam's properties and control parameters.

Contribution

It introduces a novel method to realize a topological atom laser with detailed analytic and numerical analysis of the output beam's characteristics.

Findings

Output beam's phase controlled by Raman light parameters

Analytic resonance condition for Raman coupling derived

Numerical simulations confirm beam properties in 2D and 3D

Abstract

We demonstrate how a topological atom laser can be realized by output coupling a trapped vortex state with a Raman scattering process. We find a linearized analytic solution from which a generalized resonance condition for Raman output coupling is developed. Using numerical simulations of a two component Gross-Pitaevskii equation in two and three dimensions the output beam from a trapped central vortex state is analyzed for cases of pulsed and continuous coupling where the vortex core is either transverse or parallel to the direction of propagation. We show how the parameters of the Raman light fields control the spatial phase of the output beam.