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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. Urban^2,3, and •Dario Bercioux^1,4 — 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.