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Oscillons in coupled Bose-Einstein condensates

Lookup NU author(s): Dr Gary LiuORCiD

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This is the final published version of an article that has been published in its final definitive form by American Physical Society, 2015.

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Abstract

Long-lived, spatially localized, and temporally oscillating nonlinear excitations are predicted by numerical simulation of coupled Gross-Pitaevskii equations. These oscillons closely resemble the time-periodic breather solutions of the sine-Gordon equation but decay slowly by radiating Bogoliubov phonons. Their time-dependent profile is closely matched with solutions of the sine-Gordon equation, which emerges as an effective field theory for the relative phase of two linearly coupled Bose fields in the weak-coupling limit. For strong coupling the long-lived oscillons persist and involve both relative and total phase fields. The oscillons decay via Bogoliubov phonon radiation that is increasingly suppressed for decreasing oscillon amplitude. Possibilities for creating oscillons are addressed in atomic gas experiments by collision of oppositely charged Bose-Josephson vortices and direct phase imprinting.

Publication metadata

Author(s): Su SW, Gou SC, Liu IK, Bradley A, Fialko O, Brand J

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2015

Volume: 91

Online publication date: 27/02/2015

Acceptance date: 27/02/2015

Date deposited: 18/03/2020

ISSN (print): 2469-9926

ISSN (electronic): 2469-9934

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevA.91.023631

DOI: 10.1103/PhysRevA.91.023631

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