A pulsed atomic soliton laser

TL;DR

This paper proposes a method to generate a train of stable, self-coherent solitonic pulses in a Bose-Einstein condensate by dynamically changing the scattering length and trap configuration, supported by theoretical and numerical evidence.

Contribution

It introduces a novel approach to produce a pulsed atomic soliton laser using controlled scattering length and trap inversion in BECs, with stability conditions analyzed.

Findings

Formation of self-coherent solitonic pulses demonstrated

Stability of solitons depends on trap geometry and interaction parameters

The method is feasible with current experimental techniques

Abstract

It is shown that simultaneously changing the scattering length of an elongated, harmonically trapped Bose-Einstein condensate from positive to negative and inverting the axial portion of the trap, so that it becomes expulsive, results in a train of self-coherent solitonic pulses. Each pulse is itself a non-dispersive attractive Bose-Einstein condensate that rapidly self-cools. The axial trap functions as a waveguide. The solitons can be made robustly stable with the right choice of trap geometry, number of atoms, and interaction strength. Theoretical and numerical evidence suggests that such a pulsed atomic soliton laser can be made in present experiments.