Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-11-03
New J. Phys. 11 (2009) 073036
Physics
Condensed Matter
Other Condensed Matter
4 pages, 2 figures. Title, abstract and introductory part are rewritten. Some technical details are removed
Scientific paper
We reveal a generic mechanism of generating sign-alternating inter-site interactions mediated by strongly correlated lattice bosons. The ground state phase diagram of the two-component hard-core Bose-Hubbard model on a square lattice at half-integer filling factor for each component, obtained by worm algorithm Monte Carlo simulations, is strongly modified by these interactions and features the solid+superfluid phase for strong anisotropy between the hopping amplitudes. The new phase is a direct consequence of the effective nearest-neighbor repulsion between "heavy" atoms mediated by the "light" superfluid component. Due to their sign-alternating character, mediated interactions lead to a rich variety of yet to be discovered quantum phases. quantum phases.
Capogrosso-Sansone Barbara
Prokof'ev Nikolai V.
Söyler Şebnem Güneş
Svistunov Boris V.
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