Oscillons in coupled Bose-Einstein condensates

Shih Wei Su, Shih-Chuan Gou, I. Kang Liu, Ashton S. Bradley, Oleksandr Fialko, Joachim Brand

Research output: Contribution to journalArticle

12 Citations (Scopus)

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.

Original languageEnglish
Article number023631
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume91
Issue number2
DOIs
Publication statusPublished - 2015 Feb 27

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Bose-Einstein condensates
monatomic gases
decay
phonons
vortices
collisions
radiation
profiles
excitation
simulation

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Su, Shih Wei ; Gou, Shih-Chuan ; Liu, I. Kang ; Bradley, Ashton S. ; Fialko, Oleksandr ; Brand, Joachim. / Oscillons in coupled Bose-Einstein condensates. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2015 ; Vol. 91, No. 2.
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Oscillons in coupled Bose-Einstein condensates. / Su, Shih Wei; Gou, Shih-Chuan; Liu, I. Kang; Bradley, Ashton S.; Fialko, Oleksandr; Brand, Joachim.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 91, No. 2, 023631, 27.02.2015.

Research output: Contribution to journalArticle

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AB - 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.

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