Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate
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...
| Glavni autori: | , , , , , , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
American Physical Society
2017
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| _version_ | 1826306086010880000 |
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| author | Lopes, R Eigen, C Barker, A Viebahn, KGH Robert-de-Saint-Vincent, M Navon, N Hadzibabic, Z Smith, RP |
| author_facet | Lopes, R Eigen, C Barker, A Viebahn, KGH Robert-de-Saint-Vincent, M Navon, N Hadzibabic, Z Smith, RP |
| author_sort | Lopes, R |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T06:42:36Z |
| format | Journal article |
| id | oxford-uuid:f9cd31cf-481e-433e-b96e-154eceba11dc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:42:36Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:f9cd31cf-481e-433e-b96e-154eceba11dc2022-03-27T13:00:44ZQuasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensateJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f9cd31cf-481e-433e-b96e-154eceba11dcEnglishSymplectic Elements at OxfordAmerican Physical Society2017Lopes, REigen, CBarker, AViebahn, KGHRobert-de-Saint-Vincent, MNavon, NHadzibabic, ZSmith, RPUsing 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. |
| spellingShingle | Lopes, R Eigen, C Barker, A Viebahn, KGH Robert-de-Saint-Vincent, M Navon, N Hadzibabic, Z Smith, RP Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title | Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title_full | Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title_fullStr | Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title_full_unstemmed | Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title_short | Quasiparticle energy in a strongly interacting homogeneous Bose-Einstein condensate |
| title_sort | quasiparticle energy in a strongly interacting homogeneous bose einstein condensate |
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