2 2 Se p 20 06 Carrier - density effects in many - polaron systems

Se p 20 06 Carrier - density effects in many - polaron systems

Many-polaron systems with finite charge-carrier density are often encountered experimentally. However, until recently, no satisfactory theoretical description of these systems was available even in the framework of simple models such as the one-dimensional spinless Holstein model considered here. In this work, previous results obtained using numerical as well as analytical approaches are review...

Optical response of many-polaron systems

Exact results for the density of states and the ac conductivity of the spinless Holstein model at finite carrier density are obtained combining Lanczos and kernel polynomial methods.

Many-polaron problem by cluster perturbation theory

The carrier-density dependence of the photoemission spectrum of the Holstein many-polaron model is studied using cluster perturbation theory combined with an improved cluster diagonalization by Chebychev expansion.

New type of antiferromagnetic polaron and bipolaron in HTc - superconductors

The possibility of formation of a new type of polaron based on the quantum aniferromagnet (AF) model is reported. We take into account exchange interactions between localized d-d spins of the AF, as well as the p-d interaction of the AF with p-carriers. The energy minimum is found when maximum charge density occurs on every second spin. The formation of such “comb”-like polarons results from th...

th / 0 60 70 03 v 2 1 4 Se p 20 06 Final State Interaction Effects in the e + e − → NN̄ Process near Threshold