Phase diagram of the Holstein-Kondo lattice model at 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 †

Phase diagram of the three-dimensional Hubbard model at half filling

We investigate the phase diagram of the three-dimensional Hubbard model at half filling using quantumMonte Carlo (QMC) simulations. The antiferromagnetic Néel temperature TN is determined from the specific heat maximum in combination with finite-size scaling of the magnetic structure factor. Our results interpolate smoothly between the asymptotic solutions for weak and strong coupling, respecti...

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...