A variety of physical systems, as for example, Jahn-Teller crystals, the coupled phonon-pseudospin model of the ferroelectric KDP (KH2PO4), one-dimensional conductors, and the Dicke model of super-radiance, are characterized by linear couplings between bosons (e.g., phonons) and other dynamic variables (e.g., electrons). Using a general Hamiltonian we explore various properties of such systems. We find that there are exact relations connecting the phonon static correlation functions to those of the electrons. A similar set of relations is also derived for their relaxation functions. The dynamics is then studied employing a relaxation-function formalism.
ASJC Scopus subject areas
- Condensed Matter Physics