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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 stru...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Accepted manuscript

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Publisher copy:
10.1103/physrevlett.118.210401

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ORCID:
0000-0003-3877-8478
Viebahn, KGH More by this author
Robert-de-Saint-Vincent, M More by this author
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Royal Society More from this funder
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Grant:
MSCA-IF-2015 704832
Air Force Office of Scientific Research More from this funder
Army Research Office More from this funder
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Publisher:
American Physical Society Publisher's website
Journal:
Physical Review Letters Journal website
Volume:
118
Issue:
21
Pages:
210401
Publication date:
2017-05-23
Acceptance date:
2017-04-25
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Pubs id:
pubs:700128
URN:
uri:f9cd31cf-481e-433e-b96e-154eceba11dc
UUID:
uuid:f9cd31cf-481e-433e-b96e-154eceba11dc
Local pid:
pubs:700128
Language:
English
Keywords:

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