Sum Rule for the Optical Absorption of an Interacting Many-Polaron Gas

Details Sum Rule for the Optical Absorption of an Interacting Many-Polaron Gas Sum Rule for the Optical Absorption of an Interacting Many-Polaron Gas

2000-04-26

arxiv.org/abs/cond-mat/0004435v2

Eur. Phys. J. B 20 (2001) 27

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 3 figures, revised version; new results added

Scientific paper

10.1007/PL00011092

A sum rule for the first frequency moment of the optical absorption of a many-polaron system is derived, taking into account many-body effects in the system of constituent charge carriers of the many-polaron system. In our expression for the sum rule, the electron-phonon coupling and the many-body effects in the electron (or hole) system formally decouple, so that the many-body effects can be treated to the desired level of approximation by the choice of the dynamical structure factor of the electron (hole) gas. We calculate correction factors to take into account both low and high experimental cutoff frequencies.

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