Mass of a lattice polaron from extended Holstein model using Yukawa potential

TL;DR

This paper investigates how screening effects modeled by a Yukawa potential influence the mass and mobility of lattice polarons within the Extended Holstein model at strong coupling and nonadiabatic conditions.

Contribution

It introduces a Yukawa potential for electron-phonon interaction in the Extended Holstein model, providing a more general framework for screening effects on polaron properties.

Findings

Yukawa potential generalizes previous screened force models.

Polaron with Yukawa interaction is more mobile than earlier models.

Screening radius significantly affects polaron mass and mobility.

Abstract

Renormalization of the mass of an electron is studied within the framework of the Extended Holstein model at strong coupling regime and nonadiabatic limit. In order to take into account an effect of screening of an electron-phonon interaction on a polaron it is assumed that the electron-phonon interaction potential has the Yukawa form and screening of the electron-phonon interaction is due to the presence of other electrons in a lattice. The forces are derived from the Yukawa type electron-phonon interaction potential. It is emphasized that the early considered screened force of Refs.\cite{kor-giant,spencer,hague-etal,hague-kor} is a particular case of the force deduced from the Yukawa potential and is approximately valid at large screening radiuses compared to the distances under consideration. The Extended Holstein polaron with the Yukawa type potential is found to be a more mobile than polaron studied in early works at the same screening regime.