Lattice Thermodynamics for Ultra-Cold Atoms
arXiv:0902.1017 · doi:10.1103/PhysRevA.79.063605
Abstract
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.
10 pages, 6 figures
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- Disordered insulator in an optical lattice
- Cooling in strongly correlated optical lattices: prospects and challenges
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- Thermometry with spin-dependent lattices
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- Evolution of condensate fraction during rapid lattice ramps
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- Experimental Determination of Bose-Hubbard Energies
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- Generating and detecting topological phases with higher Chern number
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- Isotope-agnostic motional ground-state cooling of neutral Yb atoms
- Disappearance of Quasiparticles in a Bose Lattice Gas
- A self-consistent Hartree-Fock approach for interacting bosons in optical lattices