Propagation of Bose-Einstein condensates in a magnetic waveguide

TL;DR

This paper reports on the experimental observation of Bose-Einstein condensates propagating through a microfabricated magnetic waveguide, highlighting the effects of inhomogeneities on single-mode propagation and potential limitations for future studies.

Contribution

It demonstrates the successful propagation of large Bose-Einstein condensates in a microfabricated magnetic waveguide and analyzes the impact of geometric imperfections on mode stability.

Findings

Single-mode propagation observed in homogeneous segments

Inhomogeneities cause transverse excitations

Microfabrication imperfections may limit waveguide applications

Abstract

Gaseous Bose-Einstein condensates of 2-3 million atoms were loaded into a microfabricated magnetic trap using optical tweezers. Subsequently, the condensates were released into a magnetic waveguide and propagated 12 mm. Single-mode propagation was observed along homogeneous segments of the waveguide. Inhomogeneities in the guiding potential arose from geometric deformations of the microfabricated wires and caused strong transverse excitations. Such deformations may restrict the waveguide physics that can be explored with propagating condensates.