Elastic and inelastic transmission in guided atom lasers: a truncated Wigner approach

TL;DR

This paper investigates the transport behavior of a Bose-Einstein condensate in a guided atom laser setup, using a truncated Wigner approach to analyze elastic and inelastic scattering phenomena.

Contribution

It introduces a truncated Wigner method for modeling atom laser transport, demonstrating its effectiveness against Matrix-Product State calculations and revealing inelastic scattering signatures.

Findings

Good agreement between truncated Wigner and Matrix-Product State results

Identification of inelastic resonant scattering signatures

Analysis of energy distribution in transmitted atomic beams

Abstract

We study the transport properties of an ultracold gas of Bose-Einstein condensate that is coupled from a magnetic trap into a one-dimensional waveguide. Our theoretical approach to tackle this problem is based on the truncated Wigner method for which we assume the system to consist of two semi-infinite non-interacting leads and a finite interacting scattering region with two constrictions modelling an atomic quantum dot. The transmission is computed in the steady-state regime and we find a good agreement between truncated Wigner and Matrix-Product State calculations. We also identify clear signatures of inelastic resonant scattering by analyzing the distribution of energy in the transmitted atomic matter wave beam.