Second‐Order Cumulant Expansion of the Free Energy and the Effective Masses of a Polaron at Finite Temperatures
Kenji Arisawa, Motohiko Saitoh
Abstract Exact perturbational results up to the second order in the coupling constant or the fourth order in the electron‐phonon interactions for the free energy, the inertial mass, and the magnetic mass of a polaron are calculated by use of the path‐integral method. New explicit analytical results are obtained for a Fröhlich polaron at finite temperatures, which in the zero temperature limit reduce to the known results.
physica status solidi (b)•Nov 1, 1983•20 citations