Evolution of a Large Fermi Surface in the Kondo Lattice

Details Evolution of a Large Fermi Surface in the Kondo Lattice Evolution of a Large Fermi Surface in the Kondo Lattice

2008-11-17

arxiv.org/abs/0811.2613v1

Phys. Rev. Lett. 102, 017202 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.102.017202

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 charge 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.

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