Spin waves in doped graphene: A time-dependent spin density functional approach to collective excitations in paramagnetic two-dimensional Dirac fermion gases

In spin-polarized itinerant electron systems, collective spin-wave modes arise from dynamical exchange and correlation (xc) effects. We consider here spin waves in doped paramagnetic graphene with adjustable Zeemantype band splitting. The spin waves are described using time-dependent spin density functional response theory, treating dynamical xc effects within the Slater and Singwi-Tosi-Land-Sjolander approximations. We obtain spinwave dispersions and spin stiffnesses as a function of doping and spin polarization, and we discuss the prospects for their experimental observation.

Automated summary

This study investigates collective spin-wave modes in doped paramagnetic graphene with adjustable Zeeman-type band splitting, utilizing time-dependent spin density functional response theory and considering dynamical exchange and correlation effects. The spin wave dispersions and stiffnesses are obtained as functions of doping and spin polarization, with potential for experimental observation discussed.