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TT: Fachverband Tiefe Temperaturen
TT 2: Graphene: Theory
(Joint session of DS, DY, HL, MA, O and TT organized by HL)
TT 2.3: Talk
Monday, March 7, 2016, 10:00–10:15, H17
Finite temperature and electric field effects in the RKKY interaction in graphene and bilayer graphene — •Nicolas Klier1, Sangeeta Sharma2, Oleg Pankratov1, and Sam Shallcross1 — 1Theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstr. 7-B2, 91058 Erlangen — 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle
The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in Bernal stacked bilayer graphene [1,2] is shown to have a particularly rich dependence on temperature and a layer symmetry breaking electric field. Depending on whether we consider the chemical potential or particle number as the fixed variable we find that an electric field may tune the RKKY between ferromagnetic (FM) and anti-ferromagnetic (AFM) coupling, or an oscillatory and AFM coupling.
[1] N. Klier, S. Shallcross, and O. Pankratov, Phys. Rev. B 90, 245118, 2014.
[2] N. Klier, S. Shallcross, S. Sharma, and O. Pankratov, Phys. Rev. B 92, 205414, 2015.