Electromagnetic drift waves in nonuniform quantum magnetized electron–positron–ion plasmas

Electromagnetic drift waves in a nonuniform quantum magnetized electron–positron–ion (EPI) plasma are studied. By using the quantum hydrodynamic equations with magnetic fields of the Wigner–Maxwell system, we obtained a new dispersion relation in which ions' motions are not considered. The positrons component (featured by the parameter ξ), density gradient of electrons, and of positrons are shown to have a significant impact on the dispersion relation. Our results should be relevant to dense astrophysical objects, e.g. white dwarf and pulsar magnetospheres, as well as low-temperature laboratory EPI plasmas.