Solitonic transmission of Bose-Einstein matter waves

TL;DR

This paper investigates how Bose-Einstein matter waves, modeled as an atom laser, transmit through a constricted wave guide, revealing two flow regimes and conditions for perfect solitonic transmission.

Contribution

It introduces a detailed analysis of solitonic and non-interacting flow regimes in atom laser transmission through constrictions, highlighting conditions for perfect solitonic transmission.

Findings

Two types of stationary flow coexist: non-interacting and solitonic.

Repulsive interactions reduce transmission at higher incident currents.

Perfect transmission occurs at specific incident fluxes for solitonic flow.

Abstract

We consider a continuous atom laser propagating through a wave guide with a constriction. Two different types of transmitted stationary flow coexist. The first one coincides, at low incident current, with the non-interacting flow. As the incident flux increases, the repulsive interactions decrease the corresponding transmission coefficient. The second type only occurs for sufficiently large incident currents and has a solitonic structure. Remarkably, for any chemical potential there always exists a value of the incident flux at which the solitonic flow is perfectly transmitted.