Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 7: Graphene 1 (Joint Session with TT)
HL 7.3: Talk
Monday, March 22, 2010, 10:45–11:00, H18
Externally induced spin relaxation in graphene — •Jan Bundesmann1, Michael Wimmer1,2, and Klaus Richter1 — 1Institut für theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — 2Instituut-Lorentz, Universiteit Leiden, 2300 RA Leiden, The Netherlands
In the fast growing research field of spintronics graphene seems to be a promising candidate. From theory weak spin-orbit interaction is expected in pure carbon-based materials. However, experimental results and theoretical predictions differ by several orders of magnitude: spin lifetimes in the experiment are much smaller than, e. g., the ones obtained from recent DFT calculations [1].
In our calculations we will include also externally induced spin-orbit interactions. Sources for this might be impurities in the substrate or adsorbed atoms. For this investigation we set up a tight-binding model for graphene including intrinsic and Rashba-type spin-orbit interactions. By local variation of the Rashba parameter we model systems with the above introduced sources of spin-orbit interaction and study spin-orbit effects on quantum transport.
[1] M. Gmitra, S. Konschuh, C. Ertler, C. Ambrosch-Draxl and J. Fabian; arxiv:0904.3315