Abstract
The low-temperature drift mobility of the polaron is calculated in perturbation theory with the aid of the Kubo formula. The result is , where is the weak coupling mobility . A comparison is made with the perturbation expansion of various intermediate coupling mobility theories. The expansion of Osaka, , agrees most closely with the exact perturbation expansion. It is concluded that the Osaka formula is probably the best in the intermediate coupling range . It is explicitly shown to lowest nontrivial order in that various quasiparticle concepts are valid, viz., that , and that the electron density is a momentum integral over .
- Received 26 August 1963
DOI:https://doi.org/10.1103/PhysRev.133.A1070
©1964 American Physical Society