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We present quantum Monte Carlo simulation results on a quantum S=1/2 XY modelwith 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 atT=0 in the superfluid phase. With the ring exchange, we then present simulationdata on small lattices which suggests that the superfluid phase persists tovery large values of the ring exchange K, without signatures of a phasetransition. We comment on the consequences of this result for the search forvarious exotic phases in three dimensions.Comment: 4 pages, 4 figure

physical review. b, condensed matter and materials physics

Persistent superfluid phase in a three-dimensional quantum<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>X</mml:mi><mml:mi>Y</mml:mi></mml:mrow></mml:math>model with ring exchange

Persistent superfluid phase in a three-dimensional quantumXYmodel with ring exchange