Publication: Quantum spin liquid in a kagome lattice spin-1/2 XY model with four-site exchange

All || By Area || By Year

Title	Quantum spin liquid in a kagome lattice spin-1/2 XY model with four-site exchange
Authors/Editors*	Long Dang, Stephen Inglis, Roger G. Melko
Where published*	Physical Review B
How published*	Journal
Year*	2011
Volume	84
Number
Pages	132409
Publisher
Keywords
Link
Abstract	We study the ground state phase diagram of a two-dimensional kagome lattice spin-1/2 XY model (J) with a four-site ring exchange interaction (K) using quantum Monte Carlo simulations. We find that the superfluid phase, existing in the regime of small ring exchange, undergoes a direct transition to a Z_2 quantum spin liquid phase at (K/J)_c ~ 22, which is related to the phase proposed by Balents, Girvin and Fisher [Phys. Rev. B, 65 224412 (2002)]. The quantum phase transition between the superfluid and the spin liquid phase has exponents z and \nu falling in the 3D XY universality class, making it a candidate for an exotic XY* quantum critical point, mediated by the condensation of bosonic spinons.