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HL: Fachverband Halbleiterphysik
HL 7: Graphene 1 (Joint Session with TT)
HL 7.8: Vortrag
Montag, 22. März 2010, 12:15–12:30, H18
Spin transport in graphene with inhomogeneous spin-orbit coupling — •Dario Bercioux1 and Alessandro De Martino2 — 1Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität, D-79104 Freiburg, Germany — 2Institut für Theoretische Physik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
Recent theoretical [1] and experimental [2] works have shown that spin-orbit couplings in graphene can play a relevant role. Motivated by these results, we address the problem of spin transport in graphene through
spin-orbit nanostructures, i.e. regions of inhomogeneous spin-orbit coupling on the nanometer scale.
In analogy with the case of usual two-dimensional electron
gases, we discuss the phenomenon of spin-double refraction [3,4] and its consequences
on the spin polarization. In particular we study the transmission properties of a single- and a double-interface between a normal region and a region with finite spin-orbit coupling, and analyze the polarization properties of these systems. In addition, for the case of the single interface, we consider the formation of bound states localized at the interface, analogous to the states occuring at the edges of graphene in the weak topological insulator regime discussed by Kane and Mele [5].
D. Huertas-Hernando, et al.,
Phys. Rev. Lett. 103, 146801 (2009).
A. Varykhalov, et al., Phys. Rev. Lett. 101, 157601 (2008).
V. M. Ramaglia, et al., Eur. Phys. J. B 36, 365 (2003).
V. M. Ramaglia, et al., J. Phys.: Condens. Matter 16, 9143 (2004).
C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 226801 (2005).