Thermal versus Quantum Fluctuations of Optical Lattice Fermions

Details Thermal versus Quantum Fluctuations of Optical Lattice Fermions Thermal versus Quantum Fluctuations of Optical Lattice Fermions

2011-07-21

arxiv.org/abs/1107.4349v2

Physics

Condensed Matter

Quantum Gases

typos corrected; figures improved; some additional discussions

Scientific paper

We show that, for fermionic atoms in a one-dimensional optical lattice, the fraction of atoms in doubly occupied sites is a highly non-monotonic function of temperature. We demonstrate that this property persists even in the presence of realistic harmonic confinement, and that it leads to a suppression of entropy at intermediate temperatures that offers a route to adiabatic cooling. Our interpretation of the suppression is that such intermediate temperatures are simultaneously too high for quantum coherence and too low for significant thermal excitation of double occupancy thus offering a clear indicator of the onset of quantum fluctuations.

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