Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Spin controlled transport II

HL 35.3: Vortrag

Mittwoch, 27. Februar 2008, 14:45–15:00, ER 164

Phonon-induced spin relaxation in graphene — •Sergej Konschuh, Christian Ertler, and Jaroslav Fabian — Institut der Theoretischen Physik, University of Regensburg, Regensburg, Germany

Motivated by the recent experiments on spin injection and spin transport in graphene 1, we investigate spin relaxation (so called T1) processes in this material within the framework of the Elliott-Yafet mechinanism: spin ralaxes via momentum spin-flip scattering processes due to the intra-atomic spin-orbit coupling. At room temperature the momentum scatting is ultimately limited by the phonons. A contuinuum model for the electron-phonon and the effective spin-orbit couplings is derived using a realistic tight-binding model 2, which is employed to calculate the spin relaxation times.

This Work is supported by SPP 1285 and SFB 689.

1 N.Tombros, C. Jozsa, M. Popinciuc, H.T. Jonkman and B.J.van Wees, Nature 448,571-574 (2007). 2 Y. Yao, F. Ye, X. Qi, S. Zhang and Z. Fang, cond-mat/0606350v3 (2007).