The Effective Mass of a Quantum Polaron
Gogolin A.O., loselevich A.S.
The dynamics of the Quantum Polaron (QP) is studied at zero temperature. The phonon variables are excluded and the Green function is obtained. An effective mass for both large adiabatic QP and small nonadiabatic QP is calculated. In the first case the principal contribution to the mass comes from the thin "crust layer* on a polaron surface.