| Issue |
Europhys. Lett.
Volume 51, Number 2, July 2000
|
|
|---|---|---|
| Page(s) | 188 - 194 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2000-00530-3 | |
| Published online | 01 September 2002 | |
Green's and spectral functions of small Fröhlich polaron
Department of Physics, Loughborough University - Loughborough LE11
3TU, UK
Received:
12
January
2000
Accepted:
17
May
2000
According to recent quantum Monte Carlo simulations, the small polaron
theory is practically
exact in a wide range of the long-range (Fröhlich)
electron-phonon coupling and adiabatic ratio. Applying Lang-Firsov transformation,
we
derive a single-particle Green's function describing the propagation
of small Fröhlich polaron. One- and two-dimensional spectral functions are studied by
expanding
Green's function perturbatively.
Remarkably, the coherent spectral weight
( Z ) and effective mass (Z') renormalisation exponents are found
to be different with 
, which can explain a small coherent spectral weight and a
relatively moderate mass enhancement in oxides.
PACS: 74.20.Mn – Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.) / 74.20.-z – Theories and models of superconducting state / 74.25.Jb – Electronic structure
© EDP Sciences, 2000
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