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H. Gimperlein, S. Wessel, Jörg Schmiedmayer, L. Santos:
"Ultracold Atoms in Optical Lattices with Random On-Site Interactions";
Physical Review Letters, 95 (2005), 170401-1 - 170401-4.

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 nontrivial tricritical point. We discuss feasible experimental realizations of our scenario in the context of ultracold atoms on optical lattices.

MATRIX RENORMALIZATION-GROUP; HUBBARD-MODEL; SUPERFLUID; GAS; LOCALIZATION; CONDENSATION; TRANSITION; RESONANCE; INSULATOR

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06588211