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Collisions of solitary waves in condensates beyond mean-field theory

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Title: Collisions of solitary waves in condensates beyond mean-field theory
Authors: Sreedharan, A
Choudhury, S
Mukherjee, R
Streltsov, A
Wüster, S
Item Type: Journal Article
Abstract: Bright solitary waves in a Bose-Einstein condensate contain thousands of identical atoms held together despite their only weakly attractive contact interactions. They nonetheless behave like a compound object, staying whole in collisions, with their collision properties strongly affected by intersoliton quantum coherence. We show that separate solitary waves decohere due to phase diffusion, dependent on their effective ambient temperature, after which their initial mean-field relative phases are no longer well defined or relevant for collisions. In this situation, collisions occur predominantly repulsively and can no longer be described within mean-field theory. When considering the timescales involved in recent solitary wave experiments where nonequilibrium phenomena play an important role, these features could explain the predominantly repulsive collision dynamics observed in most condensate soliton train experiments.
Issue Date: 6-Apr-2020
Date of Acceptance: 6-Apr-2020
URI: http://hdl.handle.net/10044/1/77975
DOI: 10.1103/physreva.101.043604
ISSN: 2469-9926
Publisher: American Physical Society (APS)
Start Page: 043604-1
End Page: 043604-14
Journal / Book Title: Physical Review A
Volume: 101
Issue: 4
Copyright Statement: ©2020 American Physical Society
Publication Status: Published online
Open Access location: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.101.043604
Article Number: 043604
Online Publication Date: 2020-04-06
Appears in Collections:Quantum Optics and Laser Science
Physics