Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Poster Session Transport & Matter at Low Temperature
TT 58.17: Poster
Donnerstag, 14. März 2013, 15:00–19:00, Poster D
Rashba spin-orbit interaction in graphene armchair nanoribbons — Lucia Lenz1, Daniel F. Urban2,3, and •Dario Bercioux1,4 — 1Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, 79104 Freiburg, Germany — 2Physikalisches Institut, Albert-Ludwigs-Universität, 79104 Freiburg, Germany — 3Fraunhofer Institute for Mechanics of Materials IWM, Wöhlerstraße 11, 79108 Freiburg, Germany — 4Department of Physics, Stanford University, Stanford, California 94305, USA
We study graphene nanoribbons (GNRs) with armchair edges in the presence of Rashba spin-orbit interaction (RSOI).
We impose the boundary conditions on the tight binding Hamiltonian for bulk graphene with RSOI by means of a sine transform
and use the results to derive different approximations and to investigate their ranges of validity.
In addition, we derive an approximation for the lowest two energy bands, which is valid for experimentally available sizes of RSOI.
Finally, we address the effect of RSOI on the spin polarization in GNRs.
We show that the spin polarization perpendicular to the nanoribbon axis changes sign when reversing the momentum along the GNR.
This effect arises from the coupling of the modes induced by RSOI.
[1] L. Lenz, D.F. Urban, D. Bercioux, arXiv:1210.2865.