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- W2052215511 abstract "We show that the current method of determining superfluidity in optical lattices based on a visibly sharp bosonic momentum distribution $n({bf k})$ can be misleading, for even a normal Bose gas can have a similarly sharp $n({bf k})$. We show that superfluidity in a homogeneous system can be detected from the so-called visibility $(v)$ of $n({bf k})$ $-$ that $v$ must be 1 within $O(N^{-2/3})$, where $N$ is the number of bosons. We also show that the T=0 visibility of trapped lattice bosons is far higher than what is obtained in some current experiments, suggesting strong temperature effects and that these states can be normal. These normal states allow one to explore the physics in the quantum critical region." @default.
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- W2052215511 date "2007-05-04" @default.
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- W2052215511 title "Criterion for Bosonic Superfluidity in an Optical Lattice" @default.
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- W2052215511 doi "https://doi.org/10.1103/physrevlett.98.180404" @default.
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