Quantum Monte Carlo simulations of the half-filled two-dimensional Kondo lattice model

Abstract

The 2D half-filled Kondo lattice model with exchange J and nearest neighbor hopping t is considered. It is shown that this model belongs to a class of Hamiltonians for which zero-temperature auxiliary field Monte Carlo methods may be efficiently applied. We compute the staggered moment, spin and quasiparticle gaps on lattice sizes up to 12 X 12. The competition between the RKKY interaction and Kondo effect leads to a continuous quantum phase transition between antiferromagnetic and spin-gaped insulators. This transition occurs at J/t = 1.45 \pm 0.05.

4 pages including 6 figures in eps format

References in corpus (1)

• Magnetic and Thermodynamic Properties of the Three-Dimensional Periodic Anderson Hamiltonian

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