Lattice dynamics of neodymium: Influence of4felectron correlations

Influence of dipole interaction on lattice dynamics of crystalline ice

The Born effective charges of component atoms and phonon spectra of a tetrahedrally coordinated crystalline ice are calculated from the first principles method based on density functional theory within the generalized gradient approximation with the projected augmented wave method. Phonon dispersion relations in a 3×1×1 supercell were evaluated from Hellmann-Feynman forces with the direct metho...

Propagation of Correlations in Quantum Lattice Systems

Recently, there has been increasing interest in understanding correlations in quantum lattice systems prompted by applications in quantum information theory and computation [10, 3, 2, 4] and the study of complex networks [5]. The questions that arise in the context of quantum information and computation are sufficiently close to typical problems in statistical mechanics that the methods develop...

Revisited Doniach diagram: Influence of short-range antiferromagnetic correlations in the Kondo lattice

The Kondo lattice model including nearest-neighbor magnetic exchange interactions is studied here in a mean-field approximation describing both the Kondo state and the intersite magnetic correlations. In the case of antiferromagnetic correlations, our model yields a decrease of the Kondo temperature compared to the one-impurity value, giving, therefore, a ‘‘revisited’’ version of the Doniach di...

Power Law Decay of Correlations in Stationary Nonequilibrium Lattice Gases with Conservative Dynamics

We report computer simulations and high-temperature approximations of the pair correlation in a stationary nonequilibrium system, a lattice gas subject to a strong uniform driving field E. The dynamics of the system is given by hoppings of particles to adjacent empty sites with rates biased for jumps in the direction of E. We study the anisotropic short-distance behavior as well as the long-dis...

Lattice Dynamics of Tetracyanoethylene