Open Conference Systems, StatPhys 27 Main Conference

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Critical phenomena of O(2) x Z2 Symmetry Breaking in Extended Kagome XY Antiferromagnets
Nobuo Furukawa, Sho Okazaki, Daisuke Yamamoto

##manager.scheduler.building##: Edificio Santa Maria Auditorio San Agustin
Date: 2019-07-10 12:00 PM – 03:45 PM
Last modified: 2019-06-14


Phase diagram and critical exponents of an extended Kagome' XY model is studied. With antiferromagnetic nearest-neighbor interactions J1, the model is characterized by O(2) spin rotaton symmetry as well as Z2 symmetry due to spin chirality at low temperatures. By introducing second-neighbor interactions J2, O(2) x Z2 symmetry breaking is observed in the ground state. Using Monte Carlo calculations, we investigatedĀ  spin O(2) transition (BKT) and chirarity Z2 phase transitions at finite temperatures, where complex interplay between these continuous and discrete degrees of freedom are expected. Transition temperatures are estimated as a function of the interaction ratio J2/J1. We discuss whether these transitions occur simultaneously or successively, by comparing critical exponents for spin and chirality sectors with those estimated by the conformal field theory.