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

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

2011-03-23

arxiv.org/abs/1103.4449v1

Physics

Condensed Matter

Quantum Gases

Scientific paper

We measure the zero-temperature equation of state of a homogeneous Bose gas of $^7$Li atoms by analyzing the \emph{in-situ} density distributions of trapped samples. For increasing repulsive interactions our data shows a clear departure from mean-field theory and provides a quantitative test of the many-body corrections first predicted in 1957 by Lee, Huang and Yang. 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 $\xi>0.44(8)$ that would characterize the universal Bose gas at the unitary limit.

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