Dynamics and Thermodynamics of the Low-Temperature Strongly Interacting Bose Gas
Abstract
We measure the zero-temperature equation of state of a homogeneous Bose gas of Li7 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).PHRVAO0031-899X10.1103/PhysRev.106.1135]. 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2011
- DOI:
- 10.1103/PhysRevLett.107.135301
- arXiv:
- arXiv:1103.4449
- Bibcode:
- 2011PhRvL.107m5301N
- Keywords:
-
- 67.85.-d;
- 05.30.Jp;
- 32.30.Bv;
- 67.60.Fp;
- Ultracold gases trapped gases;
- Boson systems;
- Radio-frequency microwave and infrared spectra;
- HeII-<sup>3</sup>He;
- Condensed Matter - Quantum Gases
- E-Print:
- Phys. Rev. Lett. 107,135301 (2011)