Persistent superfluid phase in a three-dimensional quantum XY model with ring exchange

Details Persistent superfluid phase in a three-dimensional quantum XY model with ring exchange Persistent superfluid phase in a three-dimensional quantum XY model with ring exchange

2004-08-16

arxiv.org/abs/cond-mat/0408373v1

Phys. Rev. B 71, 094511 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.71.094511

We present quantum Monte Carlo simulation results on a quantum S=1/2 XY model with ring exchange (the J-K model) on a three-dimensional simple cubic lattice. We first characterize the ground state properties of the pure XY model, obtaining estimations for the energy, spin stiffness and spin susceptibility at T=0 in the superfluid phase. With the ring exchange, we then present simulation data on small lattices which suggests that the superfluid phase persists to very large values of the ring exchange K, without signatures of a phase transition. We comment on the consequences of this result for the search for various exotic phases in three dimensions.

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