Lattice Thermodynamics for Ultra-Cold Atoms

Details Lattice Thermodynamics for Ultra-Cold Atoms Lattice Thermodynamics for Ultra-Cold Atoms

2009-02-06

arxiv.org/abs/0902.1017v1

Phys. Rev. A 79, 063605 (2009)

Physics

Atomic Physics

10 pages, 6 figures

Scientific paper

10.1103/PhysRevA.79.063605

We measure the temperature of ultra-cold Rb-87 gases transferred into an optical lattice and compare to non-interacting thermodynamics for a combined lattice--parabolic potential. Absolute temperature is determined at low temperature by fitting quasimomentum distributions obtained using bandmapping, i.e., turning off the lattice potential slowly compared with the bandgap. We show that distributions obtained at high temperature employing this technique are not quasimomentum distributions through numerical simulations. To overcome this limitation, we extract temperature using the in-trap size of the gas.

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