Quantum depletion of a homogeneous Bose-Einstein condensate

Abstract

We have measured the quantum depletion of an interacting homogeneous Bose-Einstein condensate, and confirmed the 70-year old theory of N.N. Bogoliubov. The observed condensate depletion is reversibly tuneable by changing the strength of the interparticle interactions. Our atomic homogeneous condensate is produced in an optical-box trap, the interactions are tuned via a magnetic Feshbach resonance, and the condensed fraction probed by coherent two-photon Bragg scattering.

Main text: 4 pages, 3 figures; Supplemental information: 2 pages, 4 figures

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Two and Three-body Contacts in the Unitary Bose Gas
• Observation of deviations from ideal gas thermodynamics in a trapped Bose-Einstein condensed gas
• Momentum-resolved observation of thermal and quantum depletion in an interacting Bose gas
• Strongly correlated Bose gases
• Observation of Weak Collapse in a Bose-Einstein Condensate
• Expansion of harmonically trapped interacting particles and time dependence of the contact

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