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Ultracold atoms in optical lattices with random on-site interactions

H. Gimperlein·S. Wessel·J. Schmiedmayer·L. Santos
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Abstract

We consider the physics of lattice bosons affected by disordered on-site interparticle interactions. Characteristic qualitative changes in the zero temperature phase diagram are observed when compared to the case of randomness in the chemical potential. The Mott-insulating regions shrink and eventually vanish for any finite disorder strength beyond a sufficiently large filling factor. Furthermore, at low values of the chemical potential both the superfluid and Mott insulator are stable towards formation of a Bose glass leading to a possibly non-trivial tricritical point. We discuss feasible experimental realizations of our scenario in the context of ultracold atoms on optical lattices.

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H. Gimperlein, S. Wessel, J. Schmiedmayer, L. Santos. 2005-06-22. Ultracold atoms in optical lattices with random on-site interactions. https://doi.org/10.1103/physrevlett.95.170401

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