title: Scaling in the fan of an unconventional quantum critical point.
abstract: We present results of extensive finite-temperature quantum Monte Carlo simulations on a SU(2) symmetric S=1/2 quantum antiferromagnet with four-spin interaction [A. W. Sandvik, Phys. Rev. Lett. 98, 227202 (2007)10.1103/PhysRevLett.98.227202]. Our simulations, which are free of the sign problem and carried out on lattices containing in excess of 1.6 x 10(4) spins, indicate that the four-spin interaction destroys the Néel order at an unconventional z = 1 quantum critical point, producing a valence-bond solid paramagnet. Our results are consistent with the "deconfined quantum criticality" scenario.
authors.affiliation: Department of Physics and Astronomy, University of Waterloo, Ontario, N2L 3G1, Canada.
authors.forename: Roger G
authors.initials: RG
authors.lastname: Melko
authors.forename: Ribhu K
authors.initials: RK
authors.lastname: Kaul