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Quantum Simulation

Striped phase in a quantum XY model with ring exchange.

PubMed

Authors: Sandvik AW, Daul S, Singh RR, Scalapino DJ

Year

2002

Paper ID

13118

Status

Peer-reviewed

Abstract Read

~2 min

Abstract Words

Citations

122

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.

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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.

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References & Citation Signals

[1] DOI https://doi.org/10.1103/PhysRevLett.89.247201 [2] Publisher https://pubmed.ncbi.nlm.nih.gov/12484977/

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