title: Baxter-Wu model in a transverse magnetic field.
abstract: We investigate the low-energy properties as well as quantum and thermal phase transitions of the Baxter-Wu model in a transverse magnetic field. Our study relies on stochastic series expansion quantum Monte Carlo and on series expansions about the low- and high-field limits at zero temperature using the quantum finite-lattice method on the triangular lattice. The phase boundary consists of a second-order critical line in the four-state Potts model universality class starting from the pure Baxter-Wu limit meeting a first-order line connected to the zero-temperature transition point (h≈2.4, T=0). Both lines merge at a tricritical point approximately located at (h≈2.3J, T≈J).
authors.affiliation: Laboratoire de Physique Théorique, Université de Toulouse and CNRS, UPS (IRSAMC), F-31062, Toulouse, France.
authors.forename: Sylvain
authors.initials: S
authors.lastname: Capponi
authors.affiliation: Department of Physics, K.N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran and Lehrstuhl für Theoretische Physik I, Otto-Hahn-Straße 4, D-44221 Dortmund, Germany.
authors.forename: Saeed S
authors.initials: SS
authors.lastname: Jahromi
authors.affiliation: Laboratoire de Physique Théorique, Université de Toulouse and CNRS, UPS (IRSAMC), F-31062, Toulouse, France.
authors.forename: Fabien
authors.initials: F
authors.lastname: Alet
authors.affiliation: Lehrstuhl für Theoretische Physik I, Otto-Hahn-Straße 4, D-44221 Dortmund, Germany.
authors.forename: Kai Phillip
authors.initials: KP
authors.lastname: Schmidt
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D060526:Magnetic Fields; D008962:Models, Theoretical; D044367:Phase Transition; D011789:Quantum Theory; D013269:Stochastic Processes; D013696:Temperature