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American Physical Society, Physical Review Letters, 13(107), 2011

DOI: 10.1103/physrevlett.107.135301

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Dynamics and Thermodynamics of the Low-Temperature Strongly Interacting Bose Gas

Journal article published in 2011 by Nir Navon, Kenneth John Günter, Swann Piatecki, Benno Rem, Frédéric Chevy, Trong Canh Nguyen, Werner Krauth, Christophe Salomon
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We measure the zero-temperature equation of state of a homogeneous Bose gas of (7)Li atoms by analyzing the in situ density distributions of trapped samples. For increasing repulsive interactions our data show a clear departure from mean-field theory and provide a quantitative test of the many-body corrections first predicted in 1957 by Lee, Huang, and Yang [Phys. Rev. 106, 1135 (1957).]. We further probe the dynamic response of the Bose gas to a varying interaction strength and compare it to simple theoretical models. We deduce a lower bound for the value of the universal constant ξ > 0.44(8) that would characterize the universal Bose gas at the unitary limit.