Volume 41, Number 3, february I 1998
|Page(s)||309 - 314|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Coexistence of large and small mass polarons
Istituto Nazionale di Fisica della Materia
and Dipartimento di Scienze Fisiche, Università di Napoli,
I-80125 Napoli, Italy
2 Dipartimento di Scienze Fisiche, Università di Salerno, I-85100 Salerno, Italy
Accepted: 12 December 1997
The polaron self-energy and the effective mass are studied around the point of the Brillouin zone as a function of the bare electron band width , the electron-phonon coupling constant α, and the density λ of other electrons. It is found that there are ranges of values of , α and λ in which there is coexistence of polarons with small and large masses. The effect of such coexistence on the optical infrared absorbtion coefficient in polar materials is discussed.
PACS: 71.38.+i – Polarons and electron-phonon interactions / 71.45.Gm – Exchange, correlation, dielectric and magnetic functions, plasmons / 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.)
© EDP Sciences, 1998
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