Effect of screening of the electron-phonon interaction on the temperature of Bose-Einstein condensation of intersite bipolarons

Autor: B. Yavidov, A. Kurmantayev, D. Alimov, B. Kurbanbekov, Sh. Ramonkulov
Rok vydání: 2013
Předmět:
DOI: 10.48550/arxiv.1308.2331
Popis: Here we consider an interacting electron-phonon system within the framework of extended Holstein-Hubbard model at strong enough electron-phonon interaction limit in which (bi)polarons are the essential quasiparticles of the system. It is assumed that the electron-phonon interaction is screened and its potential has Yukawa-type analytical form. An effect of screening of the electron-phonon interaction on the temperature of Bose-Einstein condensation of the intersite bipolarons is studied for the first time. It is revealed that the temperature of Bose-Einstein condensation of intersite bipolarons is higher in the system with the more screened electron-phonon interaction.
Comment: 6 pages, 4 figures
Databáze: OpenAIRE