Thermometry with spin-dependent lattices

Details Thermometry with spin-dependent lattices Thermometry with spin-dependent lattices

2009-11-20

arxiv.org/abs/0911.4143v2

New J. Phys. 12 055013 (2010)

Physics

Condensed Matter

Quantum Gases

22 pages, 8 figures v2: Several references added; Section on heating rates updated to include dipole fluctuation terms; Sectio

Scientific paper

10.1088/1367-2630/12/5/055013

We propose a method for measuring the temperature of strongly correlated phases of ultracold atom gases confined in spin-dependent optical lattices. In this technique, a small number of "impurity" atoms--trapped in a state that does not experience the lattice potential--are in thermal contact with atoms bound to the lattice. The impurity serves as a thermometer for the system because its temperature can be straightforwardly measured using time-of-flight expansion velocity. This technique may be useful for resolving many open questions regarding thermalization in these isolated systems. We discuss the theory behind this method and demonstrate proof-of-principle experiments, including the first realization of a 3D spin-dependent lattice in the strongly correlated regime.

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