PT Journal
AU Bernal, A
   Perez, A
TI Analytic behavior of the QED polarizability function at finite temperature
SO AIP Advances
JI AIP Adv.
PY 2012
BP 012152
EP 9pp
VL 2
IS 1
DI 10.1063/1.3690964
LA English
AB We revisit the analytical properties of the static quasi-photon polarizability function for an electron gas at finite temperature, in connection with the existence of Friedel oscillations in the potential created by an impurity. In contrast with the zero temperature case, where the polarizability is an analytical function, except for the two branch cuts which are responsible for Friedel oscillations, at finite temperature the corresponding function is non analytical, in spite of becoming continuous everywhere on the complex plane. This effect produces, as a result, the survival of the oscillatory behavior of the potential. We calculate the potential at large distances, and relate the calculation to the non-analytical properties of the polarizability.
ER