Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots

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DROTH, Matthias, Guido BURKARD, 2013. Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots. In: Physical Review B. 87(20). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.87.205432

@article{Droth2013Elect-24795, title={Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots}, year={2013}, doi={10.1103/PhysRevB.87.205432}, number={20}, volume={87}, issn={1098-0121}, journal={Physical Review B}, author={Droth, Matthias and Burkard, Guido} }

deposit-license Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots Droth, Matthias Burkard, Guido 2013-10-14T11:34:23Z eng Burkard, Guido Physical Review B ; 87 (2013), 20. - 205432 2013-10-14T11:34:23Z Droth, Matthias 2013 Graphene is promising as a host material for electron spin qubits because of its predicted potential for long coherence times. In armchair graphene nanoribbons (aGNRs) a small band gap is opened, allowing for electrically gated quantum dots, and furthermore the valley degeneracy is lifted. The spin lifetime T<sub>1</sub> is limited by spin relaxation, where the Zeeman energy is absorbed by lattice vibrations, mediated by spin-orbit and electron-phonon coupling. We have calculated T<sub>1</sub> by treating all couplings analytically and find that T<sub>1</sub> can be in the range of seconds for several reasons: (i) low phonon density of states away from Van Hove singularities; (ii) destructive interference between two relaxation mechanisms; (iii) Van Vleck cancellation at low magnetic fields; (iv) vanishing coupling to out-of-plane modes in lowest order due to the electronic structure of aGNRs. Owing to the vanishing nuclear spin of <sup>12</sup>C, T<sub>1</sub> may be a good measure for overall coherence. These results and recent advances in the controlled production of graphene nanoribbons make this system interesting for spintronics applications.

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