The variational self-energy method is applied to a study of the half-filled periodic Anderson model. Trial-self-energies and the numerical value of the Luttinger–Ward functional are obtained by diagonalization of a single c – f dimer. The dependence of the zero-temperature single-particle gap on the c – f-hybridization is found in qualitative agreement with mean-field theory for the Kondo-lattice, the specific heat agrees well with numerical results from density-matrix-renormalization group calculations. The single particle spectral function at finite-temperature shows marked deviations from a hybridization picture which agree well with quantum Monte–Carlo results.
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Eder, R. Thermodynamics and Single Particle Spectra of the Kondo Insulator by the Variational Self-Energy Method. J Low Temp Phys 147, 295–308 (2007). https://doi.org/10.1007/s10909-007-9310-4
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DOI: https://doi.org/10.1007/s10909-007-9310-4