| Issue |
Europhys. Lett.
Volume 41, Number 3, february I 1998
|
|
|---|---|---|
| Page(s) | 309 - 314 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00148-y | |
| Published online | 01 September 2002 | |
Coexistence of large and small mass polarons
1
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
Received:
30
July
1997
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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