Wannier-function approach to spin excitations in solids

A wave-function approach to solids

Hartree-Fock (HF) method is a useful first-step tool for investigating electronic structure and total energy of atoms and molecules: it gives very good electron density, reasonably accurate total energy, and molecular orbitals and orbital energies that are helpful for understanding the electronic structure. The HF method is, however, not commonly applied to solids nowadays, since electronic scr...

Non-linear Dynamical Excitations in Solids

Vibrational excitations can exist in non-linear systems which have no counterpart in the corresponding linear systems. In this paper we investigate such excitations in systems where the non-linearity is of an on-site character. In particular, we analyze the existence conditions for localized (and delocalized) excitations, and their interaction with external fields. In this paper we discuss the ...

Time-Resolved Speckle Analysis: A New Approach to Coherence and Dephasing of Optical Excitations in Solids

Spin excitations in ferromagnetic manganites

An effective one–band Hamiltonian for colossal–magnetoresistance (CMR) manganites is constructed and the spin excitations are determined. Fitting the experimental data by the derived spin–wave dispersion gives an eg–electron hopping amplitude of about 0.2 eV in agreement with LDA band calculations.

Spin Dynamics in Disordered Solids

Main specifics of the theory of spin dynamics in disordered solids results from the fact, that calculation of observable values must start from the solution of equation of motion, and then they should be averaged over random distribution of spins in the sample. Nominally any problem in statistical physics looks analogously, but content of existing text books is formed by much more simple bypass...