Exciton condensation due to electron-phonon interaction

Exciton-phonon interaction in GaSe

A NUMERICAL RENORMALIZATION GROUP APPROACH FOR AN ELECTRON-PHONON INTERACTION

A finite chain calculation in terms of Hubbard X-operators is explored by setting up a vibronic Harniltonian. The model conveniently transformed into a form so that in the case of strong coupling a numerical renormalization group approach is applicable. To test the technique, a one particle Green function is calculated for the model Harniltonian

Phonon softening and double-well potential formation due to electron-phonon interaction in heavy-fermion systems

We investigate the periodic Anderson-Holstein model by using the dynamical mean-field theory combined with the exact diagonalization method. For the strong electron-phonon coupling g > ∼ gc, the system shows an anomalous heavy-fermion behaviour which is accompanied by a large lattice fluctuation and an extreme phonon softening. We also calculate an effective potential for the ions and find that...

Phonon linewidths due to electron—phonon coupling in NbC

We calculated the linewidths due to electron—phonon coupling of the acoustic phonon modes in NbC within a first-principles linear-response scheme. We find a pronounced correlation between anomalies in the phonon frequencies and the corresponding phonon linewidths originating from details of the Fermi surface. ( 1999 Elsevier Science B.V. All rights reserved.

a numerical renormalization group approach for an electron-phonon interaction

a finite chain calculation in terms of hubbard x-operators is explored by setting up a vibronic harniltonian. the model conveniently transformed into a form so that in the case of strong coupling a numerical renormalization group approach is applicable. to test the technique, a one particle green function is calculated for the model harniltonian