Striped Phase in a Quantum Model with Ring Exchange
AW Sandvik, S Daul, RRP Singh, DJ Scalapino - Physical review letters, 2002 - APS
AW Sandvik, S Daul, RRP Singh, DJ Scalapino
Physical review letters, 2002•APSWe present quantum Monte Carlo results for a square-lattice S= 1/2 XY model with a
standard nearest-neighbor coupling J and a four-spin ring exchange term K. Increasing K/J,
we find that the ground state spin stiffness vanishes at a critical point at which a spin gap
opens and a striped bond-plaquette order emerges. At still higher K/J, this phase becomes
unstable and the system develops a staggered magnetization. We discuss the quantum
phase transitions between these phases.
standard nearest-neighbor coupling J and a four-spin ring exchange term K. Increasing K/J,
we find that the ground state spin stiffness vanishes at a critical point at which a spin gap
opens and a striped bond-plaquette order emerges. At still higher K/J, this phase becomes
unstable and the system develops a staggered magnetization. We discuss the quantum
phase transitions between these phases.
We present quantum Monte Carlo results for a square-lattice model with a standard nearest-neighbor coupling and a four-spin ring exchange term . Increasing , we find that the ground state spin stiffness vanishes at a critical point at which a spin gap opens and a striped bond-plaquette order emerges. At still higher , this phase becomes unstable and the system develops a staggered magnetization. We discuss the quantum phase transitions between these phases.
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