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Accueil du site > Publications > Publications 2009 > A Generalized Quantum Dimer Model Applied to the Frustrated Heisenberg Model on the Square Lattice : Emergence of a Mixed Columnar-Plaquette Phase

A Generalized Quantum Dimer Model Applied to the Frustrated Heisenberg Model on the Square Lattice : Emergence of a Mixed Columnar-Plaquette Phase

A. Ralko, M. Mambrini and D. Poilblanc

par Didier Poilblanc - 24 mai 2009

Aiming to describe frustrated quantum magnets with non-magnetic singlet ground states, we have extended the Rokhsar-Kivelson (RK) loop-expansion to derive a generalized Quantum Dimer Model containing only connected terms up to arbitrary order. For the square lattice frustrated Heisenberg antiferromagnet (J1-J2-J3 model), an expansion up to 8th order shows that the leading correction to the original RK model comes from dimer moves on length-6 loops. This model free of the original sign problem is treated by advanced numerical techniques. The results suggest that a rotationally anisotropic plaquette phase is the ground state of the Heisenberg model in the parameter region of maximum frustration.