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arXiv · 0811.0397

Sign-Alternating Interaction Mediated by Strongly-Correlated Lattice Bosons

Ş. G. Söyler·B. Capogrosso-Sansone·N. V. Prokof'ev·B. V. Svistunov
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Abstract

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.

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Ş. G. Söyler, B. Capogrosso-Sansone, N. V. Prokof'ev, B. V. Svistunov. 2009-01-05. Sign-Alternating Interaction Mediated by Strongly-Correlated Lattice Bosons. https://doi.org/10.1088/1367-2630%2F11%2F7%2F073036

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