Polarization operator in the 2+1 dimensional quantum electrodynamics with a nonzero fermion density in a constant uniform magnetic fieldстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 июля 2015 г.
Аннотация:The polarization operator (tensor) for planar
charged fermions in a constant uniform magnetic field is calculated
in the one-loop approximation of 2 +1-dimensional
quantum electrodynamics (QED2+1) with a nonzero fermion
density. We construct the Green function of the Dirac equation
with a constant uniform external magnetic field in
QED2+1 at a finite chemical potential, find the imaginary part
of this Green function, and then obtain the polarization tensor
related to the combined contribution from real particles
occupying the finite number of energy levels and magnetic
field. We expect that some physical effects under consideration
seem likely to be revealed in a monolayer graphene
sample in the presence of an external constant uniform magnetic
field B perpendicular to it.