Journal article
Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate
- Abstract:
- Using two-photon Bragg spectroscopy, we study the energy of particlelike excitations in a strongly interacting homogeneous Bose-Einstein condensate, and observe dramatic deviations from Bogoliubov theory. In particular, at large scattering length a the shift of the excitation resonance from the free-particle energy changes sign from positive to negative. For an excitation with wave number q, this sign change occurs at a≈4/(πq), in agreement with the Feynman energy relation and the static structure factor expressed in terms of the two-body contact. For a≳3/q we also see a breakdown of this theory, and better agreement with calculations based on the Wilson operator product expansion. Neither theory explains our observations across all interaction regimes, inviting further theoretical efforts.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
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- Files:
-
-
(Preview, Accepted manuscript, pdf, 827.8KB, Terms of use)
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- Publisher copy:
- 10.1103/physrevlett.118.210401
Authors
- Publisher:
- American Physical Society
- Journal:
- Physical Review Letters More from this journal
- Volume:
- 118
- Issue:
- 21
- Pages:
- 210401
- Publication date:
- 2017-05-23
- Acceptance date:
- 2017-04-25
- DOI:
- EISSN:
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1079-7114
- ISSN:
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0031-9007
- Pmid:
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28598671
- Language:
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English
- Keywords:
- Pubs id:
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pubs:700128
- UUID:
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uuid:f9cd31cf-481e-433e-b96e-154eceba11dc
- Local pid:
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pubs:700128
- Source identifiers:
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700128
- Deposit date:
-
2018-06-19
Terms of use
- Copyright holder:
- American Physical Society
- Copyright date:
- 2017
- Notes:
- © 2017 American Physical Society. This is the accepted manuscript version of the article. The final version is available online from American Physical Society at: https://doi.org/10.1103/PhysRevLett.118.210401
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