Contrary to optics, understanding the propagation of an elementary excitation
requires replacing the single body description by a many body one.
Their topics include the thermodynamics of surface phenomena, localized states and surface elementary excitations
, calculating adhesion characteristics of metals and their melts by the density functional method, friction of surfaces of solids with no lubrication, and ferromagnetism in ultrathin films of transition metals.
This parabola crosses the Landau-Feynman dispersion curve for elementary excitations
in superfluid [.
of Parma, Italy) examines the elementary excitations
in magnetic periodic structures, the spin waves or magnons, which are shown to behave like an ideal Bose gas at low temperature and an interacting Bose system at higher temperature.