Abstract
Employing the closed-time-path Green's function formalism (CTPGF), the electron self-energy and vertex function at finite temperature are derived at one-loop level. The so-called “double termn” does not appear in our approach and thus, the unitarity of the theory is ensured automatically. The temperature-dependent mass and vertex corrections are dispersive due to the existence of electron-positron pair background. In the nonrelativistic limit, the explicit forms of shifts due to temperature of both mass and Lande's factor are given, and their low temperature and high temperature limits are discussed.
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