Abstract
We report here a microscopic theoretical study of dynamic anti-ferromagnetic spin susceptibility of electrons for graphene systems, which deal with a tight-binding model Hamiltonian consisting of the hopping of electrons up to third nearest-neighbours, impurity and substrate effects besides Coulomb interaction of electrons at A-and B- sub-lattices. The spin susceptibility involves four two-particle Green's functions, which are calculated by Zubarev's Green's function technique. The up and down spin electron occupancies at A and B sub-lattices are computed numerically and self-consistently. The temperature dependent susceptibility becomes smooth for U=uct1 with critical Coulomb potential uc=2.2, whereas the susceptibility shows more suppression at low temperatures in anti-ferromagnetic phase for u uc. The susceptibility is suppressed due to the increase of external periodic frequency imposed on the system. The A site doping enhances the susceptibility, while the B site doping suppresses it. The increase of the substrate induced gap enhances the susceptibility. The energy dependent real part of susceptibility shows that susceptibility minima shift to higher energies with increase of substrate induced gap.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: IOP Conference Series: Materials Science and Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
