Title
All-coupling polaron optical response : analytic approaches beyond the adiabatic approximation All-coupling polaron optical response : analytic approaches beyond the adiabatic approximation
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
New York, N.Y :American Physical Society ,
Subject
Physics
Source (journal)
Physical review B / American Physical Society. - New York, N.Y, 2016, currens
Volume/pages
94(2016) :12 , 13 p.
ISSN
2469-9969
2469-9950
Article Reference
125206
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In the present work, the problem of an all-coupling analytic description for the optical conductivity of the Fröhlich polaron is treated, with the goal being to bridge the gap in the validity range that exists between two complementary methods: on the one hand, the memory-function formalism and, on the other hand, the strong-coupling expansion based on the Franck-Condon picture for the polaron response. At intermediate coupling, both methods were found to fail as they do not reproduce diagrammatic quantum Monte Carlo results. To resolve this, we modify the memory-function formalism with respect to the Feynman-Hellwarth-Iddings-Platzman approach in order to take into account a nonquadratic interaction in a model system for the polaron. The strong-coupling expansion is extended beyond the adiabatic approximation by including in the treatment nonadiabatic transitions between excited polaron states. The polaron optical conductivity that we obtain at T=0
Full text (open access)
https://repository.uantwerpen.be/docman/irua/c40df5/135775.pdf
Handle