Phase evolution of the two-dimensional Kondo lattice model near half-filling

Phase evolution of the two-dimensional Kondo lattice model near half-filling.

Within a mean-field approximation, the ground state and finite temperature phase diagrams of the two-dimensional Kondo lattice model have been carefully studied as functions of the Kondo coupling J and the conduction electron concentration [Formula: see text]. In addition to the conventional hybridization between local moments and itinerant electrons, a staggered hybridization is proposed to ch...

Quantum phase transition in one dimensional extended Kondo lattice model away from half filling

We study one dimensional extended Kondo lattice model, described by the t − J Hamiltonian for conduction electrons away from half filling and the Heisenberg Hamiltonian for localized spins at half filling. Following Shankar,[1] we find an effective field theory for this model, where doped holes are represented by massless Dirac fermions (holons) and spin excitations are fractionalized into rela...

The one dimensional Kondo lattice model at partial band filling †

One-dimensional Kondo lattice model at quarter filling

We revisit the problem of the quarter-filled one-dimensional Kondo lattice model, for which the existence of a dimerized phase and a nonzero charge gap had been reported by Xavier et al. Phys. Rev. Lett. 90, 247204 2003 . Recently, some objections were raised claiming that the system is neither dimerized nor has a charge gap. In the interest of clarifying this important issue, we show that thes...

Finite-temperature properties of the two-dimensional Kondo lattice model

Using the recently developed Lanczos technique we study finite-temperature properties of the 2D Kondo lattice model at various fillings of the conduction band. At half filling the quasiparticle gap governs physical properties of the chemical potential and the charge susceptibility at small temperatures. In the intermediate coupling regime quasiparticle gap scales approximately linearly with the...