Evolution of a Large Fermi Surface in the Kondo Lattice

Junya Otsuki, Hiroaki Kusunose, Yoshio Kuramoto
2009 Physical Review Letters  
Single-particle spectrum of the Kondo lattice model is derived with use of the continuous-time quantum Monte Carlo method, combined with the dynamical mean-field theory. Crossover behavior is traced quantitatively either to a heavy Fermi-liquid state or to a magnetically ordered state from the local-moment state at high temperatures. The momentum distribution in the low-temperature limit acquires a discontinuity at the location that involves the local-spin degrees of freedom. Even without the
more » ... arge degrees of freedom for local electrons, the excitation spectra exhibit hybridized bands similar to those in the Anderson lattice. Temperature dependence in the zero-energy component of the self-energy is crucial in forming the Fermi-liquid state with the large Fermi surface.
doi:10.1103/physrevlett.102.017202 pmid:19257234 fatcat:kgldp7hzsfeurkfurxpcl6tszi