Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Graphene -Spin-Orbit Interaction (jointly with DS,HL,MA,O)
TT 11.4: Talk
Monday, March 11, 2013, 12:15–12:30, H17
Long Electron Spin Lifetimes in Armchair Graphene Nanoribbons — •Matthias Droth and Guido Burkard — University of Konstanz, 78457 Konstanz
Armchair graphene nanoribbons (aGNR) are promising as a host material for electron spin qubits because of their potential for scalability and long coherence times [1]. The spin lifetime T1 is limited by spin relaxation, where the Zeeman energy is absorbed by lattice vibrations [2], mediated by spin-orbit and electron-phonon coupling. We have calculated T1 by treating all couplings analytically and find that T1 can be in the range of seconds for several reasons: (i) Van Vleck cancellation; (ii) weak spin-orbit coupling; (iii) low phonon density; (iv) vanishing coupling to out-of-plane modes due to the electronic structure of the aGNR. Owing to the vanishing nuclear spin of 12C , T1 is a good measure for overall coherence. These results and recent advances in the controlled production of graphene nanoribbons [3] make this system interesting for classical and quantum spintronics applications.
1ex[1] B. Trauzettel et al., Nature Phys. 3, 192-196 (2007).
[2] M. Droth and G. Burkard, Phys. Rev. B 84, 155404 (2011).
[3] X. Zhang et al., arXiv:1205.3516 (2012).