Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-22
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 2 figures
Scientific paper
10.1103/PhysRevB.65.195103
We present a phase diagram for a dilute two-dimensional Bose-gas on a lattice. For one sort of boson we consider a realistic case of the van der Waals interaction between particles with a strong hard-core repulsion $U$ and a van der Waals attractive tail $V$. For $V< 2 t $, $t$ being a hopping amplitude, the phase diagram of the system contains regions of the usual one-particle Bose-Einstein condensation (BEC). However for $V>2t$ we have total phase separation on a Mott-Hubbard Bose solid and a dilute Bose gas. For two sorts of structureless bosons described by the two band Hubbard model an s-wave pairing of the two bosons of different sort $
Efremov Dmitri V.
Kagan Maxim Yu.
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