Fractionalized long-range ordered state in a Falicov-Kimball model

Article

关键词: MEAN-FIELD THEORY;    ELECTRON CORRELATIONS;    MOTT INSULATOR;    HUBBARD-MODEL;    TRANSITION;    FERMIONS;    ENERGY;    THERMODYNAMICS;    DIMENSIONS;   

DOI  :  10.1103/PhysRevB.99.165104

来源: SCIE

【 摘 要 】

A Falicov-Kimball model which thermodynamically reduces the local Coulomb interaction of particles to attraction or repulsion is studied within the dynamical mean-field theory. In the strong interaction regime a fractionalization of particles into charge and spin objects, the physical properties of which are different from the whole particles, is observed in both high-and low-temperature phases. At high temperature and strong interaction the single-particle density of states opens an excitation gap, but the charge compressibility and the spin susceptibility exhibit the features of gapless excitations. The low-temperature phase has a long-range order, and the single-particle spectra are always gapped, while the charge and spin excitations are gapless in the strong interaction regime. In the fractionalized long-range ordered phase both the charge compressibility and the spin susceptibility are universal scaling functions of temperature.

【 授权许可】

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