Magnetic edge states and coherent manipulation of graphene nanoribbons

Michael Slota, Ashok Keerthi, William K. Myers, Evgeny Tretyakov, Martin Baumgarten, Arzhang Ardavan, Hatef Sadeghi, Colin J. Lambert, Akimitsu Narita, Klaus Müllen and Lapo Bogani ()
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Michael Slota: University of Oxford
Ashok Keerthi: Max-Planck-Institut für Polymerforschung
William K. Myers: University of Oxford
Evgeny Tretyakov: N. N. Vorozhtsov Novosibirsk Institute of Organic Chemistry
Martin Baumgarten: Max-Planck-Institut für Polymerforschung
Arzhang Ardavan: University of Oxford
Hatef Sadeghi: Lancaster University
Colin J. Lambert: Lancaster University
Akimitsu Narita: Max-Planck-Institut für Polymerforschung
Klaus Müllen: Max-Planck-Institut für Polymerforschung
Lapo Bogani: University of Oxford

Nature, 2018, vol. 557, issue 7707, 691-695

Abstract: Abstract Graphene, a single-layer network of carbon atoms, has outstanding electrical and mechanical properties 1 . Graphene ribbons with nanometre-scale widths2,3 (nanoribbons) should exhibit half-metallicity 4 and quantum confinement. Magnetic edges in graphene nanoribbons5,6 have been studied extensively from a theoretical standpoint because their coherent manipulation would be a milestone for spintronic 7 and quantum computing devices 8 . However, experimental investigations have been hampered because nanoribbon edges cannot be produced with atomic precision and the graphene terminations that have been proposed are chemically unstable 9 . Here we address both of these problems, by using molecular graphene nanoribbons functionalized with stable spin-bearing radical groups. We observe the predicted delocalized magnetic edge states and test theoretical models of the spin dynamics and spin–environment interactions. Comparison with a non-graphitized reference material enables us to clearly identify the characteristic behaviour of the radical-functionalized graphene nanoribbons. We quantify the parameters of spin–orbit coupling, define the interaction patterns and determine the spin decoherence channels. Even without any optimization, the spin coherence time is in the range of microseconds at room temperature, and we perform quantum inversion operations between edge and radical spins. Our approach provides a way of testing the theory of magnetism in graphene nanoribbons experimentally. The coherence times that we observe open up encouraging prospects for the use of magnetic nanoribbons in quantum spintronic devices.

Date: 2018
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DOI: 10.1038/s41586-018-0154-7

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