Superradiant exchange of orbital angular momentum between light and cold atoms

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

An analysis of superradiant scattering of light by ultracold atoms is presented in which the pump and scattered light consist of hollow counterrotating Laguerre-Gaussian beams possessing orbital angular momentum. It is shown that the interaction between the Laguerre-Gaussian beams and the atoms can give rise to a superradiant instability in which orbital angular momentum is transferred to the atoms and the probe field is amplified. In the case where the atoms constitute a dilute Bose-Einstein condensate (BEC) that is trapped in a one-dimensional ring geometry, the transfer of orbital angular momentum to the BEC during the instability means that the BEC spontaneously develops rotation in the ring.

LanguageEnglish
Article number023426
Number of pages5
JournalPhysical Review A
Volume85
Issue number2
DOIs
Publication statusPublished - 28 Feb 2012

Fingerprint

angular momentum
Bose-Einstein condensates
orbitals
atoms
rings
hollow
pumps
probes
geometry
scattering
interactions

Keywords

  • orbital angular momentum
  • light
  • optics
  • cold atoms

Cite this

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Superradiant exchange of orbital angular momentum between light and cold atoms. / Robb, G. R. M.

In: Physical Review A, Vol. 85, No. 2, 023426, 28.02.2012.

Research output: Contribution to journalArticle

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AB - An analysis of superradiant scattering of light by ultracold atoms is presented in which the pump and scattered light consist of hollow counterrotating Laguerre-Gaussian beams possessing orbital angular momentum. It is shown that the interaction between the Laguerre-Gaussian beams and the atoms can give rise to a superradiant instability in which orbital angular momentum is transferred to the atoms and the probe field is amplified. In the case where the atoms constitute a dilute Bose-Einstein condensate (BEC) that is trapped in a one-dimensional ring geometry, the transfer of orbital angular momentum to the BEC during the instability means that the BEC spontaneously develops rotation in the ring.

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KW - optics

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