Akos Rapp, Xiaolong Deng, Luis Santos
We show that a time-dependent magnetic field leading to a periodically modulated scattering length results in an effective novel form of non-linear hopping for atoms in optical lattices, which depends on the atom number difference at neighboring sites. We discuss the rich physics introduced by this hopping, including pair superfluidity, exactly defect-free Mott-insulator states for finite hopping, and pure holon- and doublon superfluids. We also address experimental detection, showing that the introduced non-linear hopping may lead in harmonically trapped gases to abrupt drops in the density profile marking the interface between different superfluid regions.
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http://arxiv.org/abs/1207.0641
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