Dynamics and thermodynamics of the low-temperature strongly interacting Bose gas.
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.
Laboratoire Kastler Brossel, CNRS, UPMC, École Normale Supérieure, Paris, France. navon@ens.fr
Nir
N
Navon
Swann
S
Piatecki
Kenneth
K
Günter
Benno
B
Rem
Trong Canh
TC
Nguyen
Frédéric
F
Chevy
Werner
W
Krauth
Christophe
C
Salomon