Thermal versus Quantum Fluctuations of Optical Lattice Fermions

Campo, Vivaldo L and Capelle, Klaus and Hooley, Chris and Quintanilla, Jorge and Scarola, Vito W (2012) Thermal versus Quantum Fluctuations of Optical Lattice Fermions. Physical Review B: Condensed Matter and Materials Physics . ISSN 0163-1829. (Full text available)

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http://dx.doi.org/10.1103/PhysRevA.85.033644

Abstract

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 clear 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.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Jorge Quintanilla
Date Deposited: 28 Jul 2011 10:31
Last Modified: 19 Nov 2014 17:53
Resource URI: http://kar.kent.ac.uk/id/eprint/28033 (The current URI for this page, for reference purposes)
ORCiD (Campo, Vivaldo L):
ORCiD (Capelle, Klaus):
ORCiD (Hooley, Chris):
ORCiD (Quintanilla, Jorge):
ORCiD (Scarola, Vito W):
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