Study of systems with electron-electron and electron-lattice interaction
electron-electron, electron-lattice, localization
In this work, we studied the electronic dynamics under the influence of Coulomb interaction
and also the effect of phonon interaction. Within the context of the Coulomb interaction,
we will demonstrate that the electron-electron term in a one-dimensional lattice creates
a subband of bounded states, initially standing out from the main band of states for
U = 8, also observed for U = 12. Our Hamiltonian considers the local and first-neighbor
interactions between electrons. The results show the appearance of a new subband due
to the interaction between the first neighbors and the broadening of this subband due to
the local interaction between the particles. The system’s dynamic under the action of an
external electric field shows that interaction between particles promotes coherent movement,
resulting in oscillation modes with doubled frequency. The electronic propagation under the
effect of electron-lattice interaction was investigated within the standard cubic nonlinear
profile. We introduce the coupling between the electron and the lattice through the hopping
distribution. We solve the coupled equation set to electron and lattice and calculate the
electronic position as a function of time. We provide a detailed investigation of the electron
and lattice dynamics for a wide range of electron-lattice coupling intensities. Our results
demonstrate that depending on the initial condition we consider and the intensity of the
electron-lattice interaction, we can obtain (or not) an electron-phonon pair formation.
Our results reveal that, depending on the initial velocity of the lattice and the degree
of electron-lattice the term, we can observe a repulsion between electron and lattice
deformation.