Phase Transitions in Spin-1/2 Falicov–Kimball Model on a Two-dimensional Triangular Lattice
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Phase transitions from low-temperature (ordered) phases to high-temperature (disordered/homogeneous) phases for different fillings are studied on a triangular lattice using the spin-dependent Falicov–Kimball model. Numerical diagonalization and Monte Carlo simulation methods are used to study thermodynamic properties of the system. It has been observed that low-temperature ordered phases persist up to a finite temperature and after reaching a critical temperature (\(T_c\)), homogeneous phases are observed for all parameter space. We have also calculated the temperature dependence of specific heat and observed a sharp jump at \(T_c\) indicating the phase transition, and this \(T_c\) increases with increase in on-site Coulomb correlation U and electron fillings.
KeywordsStrongly correlated electronic systems Numerical simulations Triangular lattice Exchange interaction
SK and AR acknowledge MHRD and CSIR (India), respectively, for research fellowships.
- 8.A.H.C. Neto, Phys. Rev. Lett. 86, 4383 (2001)Google Scholar