Striped phase in a quantum XY-model with ring exchange

Details Striped phase in a quantum XY-model with ring exchange Striped phase in a quantum XY-model with ring exchange

2002-05-13

arxiv.org/abs/cond-mat/0205270v2

Phys. Rev. Lett. 89, 247201 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures. v2: only minor changes

Scientific paper

10.1103/PhysRevLett.89.247201

We 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.

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