
Phase Diagram of the Kitaevtype Model on a Decorated Honeycomb Lattice in the Isolated Dimer LimitPhase Diagram of the Kitaevtype Model on a Decorated Honeycomb Lattice in the Isolated Dimer Limit Phase Diagram of the Kitaevtype Model on a Decorated Honeycomb Lattice in the Isolated Dimer Limit 
"/那須, 譲治/"那須, 譲治 ,
"/Nasu, Joji/"Nasu, Joji ,
"/求, 幸年/"求, 幸年 ,
"/Motome, Yukitoshi/"Motome, Yukitoshi
75pp.755

762 , 201512 , Elsevier B.V.
Description
An effective model in the isolated dimer limit of the Kitaevtype model on a decorated honeycomb lattice is investigated at finite temperature. The ground state of this model is exactly shown to be a chiral spin liquid with spontaneous breaking of time reversal symmetry. We elaborate the finitetemperature phase diagram by using the meanfield approximation and Monte Carlo simulation. We find that the phase transition between the hightemperature paramagnetic phase and the lowtemperature chiral spin liquid phase is always of second order in the Monte Carlo results, although a tricritical point appears in the meanfield phase diagram. The finitesize scaling analysis of the Monte Carlo data indicates that the phase transition belongs to the twodimensional Ising universality class.