Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-05-04
Phys. Rev. B 83, 174421 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
8 pages, 7 figures. Published version
Scientific paper
10.1103/PhysRevB.83.174421
We investigate the competition between spin-supersolidity and phase separation in a frustrated spin-half model of weakly coupled dimers. We start by considering systems of hard-core bosons on the square lattice, onto which the low-energy physics of the herein investigated spin model can be mapped, and devise a criterion for gauging the interplay between supersolid order and domain wall formation based on strong coupling arguments. Effective bosonic models for the spin model are derived via the contractor renormalization (CORE) algorithm and we propose to combine a self-consistent cluster mean-field solution with our criterion for the occurrence of phase separation to derive the phase diagram as a function of frustration and magnetic field. In the limit of strong frustration, the model is shown to be unstable toward phase separation, in contradiction with recently published results. However, a region of stable supersolidity is identified for intermediate frustration, in a parameter range not investigated so far and of possible experimental relevance.
Albuquerque Fabricio A.
Laflorencie Nicolas
Mila Frédéric
Picon Jean-David
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