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arXiv · 0809.3239

Discerning Incompressible and Compressible Phases of Cold Atoms in Optical Lattices

V. W. Scarola·L. Pollet·J. Oitmaa·M. Troyer
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Abstract

Experiments with cold atoms trapped in optical lattices offer the potential to realize a variety of novel phases but suffer from severe spatial inhomogeneity that can obscure signatures of new phases of matter and phase boundaries. We use a high temperature series expansion to show that compressibility in the core of a trapped Fermi-Hubbard system is related to measurements of changes in double occupancy. This core compressibility filters out edge effects, offering a direct probe of compressibility independent of inhomogeneity. A comparison with experiments is made.

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V. W. Scarola, L. Pollet, J. Oitmaa, M. Troyer. 2009-11-04. Discerning Incompressible and Compressible Phases of Cold Atoms in Optical Lattices. https://doi.org/10.1103/physrevlett.102.135302

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