Striped phase in a quantum XY-model with ring exchange

Preprint

2 December 2002

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0205270

Abstract

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.

Keywords

TRANSITIONS BETWEEN THESE PHASES
CRITICAL POINT
STRIPED PHASE
RING EXCHANGE
QUANTUM PHASE
MONTE CARLO
QUANTUM XY
XY MODEL

All Related Versions

Version 1, 2002-05-13, ArXiv
Version 2, 2002-12-02, ArXiv
Published version: Physical Review Letters, 89 (24), 247201.

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