Dielectric function, screening, and plasmons of graphene in the presence of spin-orbit interactions
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical Society.Date
2012-11-21Citation
10.1103/PhysRevB.86.195424
Physical Review B 86.19 (2012): 195424
ISSN
10980121; 1550-235XDOI
10.1103/PhysRevB.86.195424Funded by
This work was supported by Deutsche Forschungsgemeinschaft via Grant No. GRK 1570, by FCT under Grant No. PTDC/FIS/101434/2008, and MIC under Grant No. FIS2010-21883-C02-02Project
Gobierno de España. FIS2010-21883-C02-02Editor's Version
http://dx.doi.org/10.1103/PhysRevB.86.195424Subjects
FísicaRights
© 2012 American Physical Society.Abstract
We study the dielectric properties of graphene in the presence of Rashba and intrinsic spin-orbit interactions in their most general form, i.e., for arbitrary frequency, wave vector, doping, and spin-orbit coupling (SOC) parameters. The main result consists in the derivation of closed analytical expressions for the imaginary as well as for the real part of the polarization function. Several limiting cases, e.g., the case of purely Rashba or purely intrinsic SOC, and the case of equally large Rashba and intrinsic coupling parameters are discussed. In the static limit the asymptotic behavior of the screened potential due to charged impurities is derived. In the opposite limit (q=0, ω→0), an analytical expression for the plasmon dispersion is obtained and afterwards compared to the numerical result. Our result can also be applied to related systems such as bilayer graphene or topological insulators
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Google Scholar:Scholz, Andreas
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Stauber, Tobias
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Schliemann, John
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