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Spin transport in graphene interfaced with strong spin-orbit materials

Jeudi 7 février 11:00 - Duree : 1 heure
Lieu : Salle du bâtiment accueil, CEA - 17 rue des Martyrs - Grenoble

Orateur : Aron CUMMINGS (ICN2, Barcelona, Spain)

Spintronics is an area of research that uses an electron’s spin, instead of its charge, as a means of storing and manipulating information. Owing to its small spin-orbit coupling (SOC), graphene has proven to be an efficient carrier of spin [1], making it promising for spintronics applications. However, small SOC also precludes the active manipulation or generation of spin currents. Recent work has thus focused on interfacing graphene with high-SOC materials such as transition metal dichalcogenides (TMDCs) or topological insulators (TIs) in the hope of inducing strong SOC in graphene while maintaining its superior transport properties [2-5]. In this talk, I will briefly introduce the concepts of spintronics, spin-orbit coupling, and spin transport, followed by a high-level review of the studies of spin transport in graphene. I will then present our group’s recent efforts to describe the nature of SOC and spin transport induced in graphene by proximity to TMDCs and TIs. We find that spin transport in these systems is distinguished by a giant spin lifetime anisotropy, with spins oriented in the graphene plane relaxing much faster than spins pointing out of the plane [6,7]. This anisotropy arises from the specific nature of the SOC induced in the graphene layer, which depends on the symmetry of the graphene/TMDC or TI interface. In addition to serving as a probe of SOC induced in graphene, giant spin lifetime anisotropy may also prove useful for spintronics, for example serving as an orientation-dependent spin filter.

[1] M. Drögeler et al., Nano Lett. 16, 3533 (2016)

[2] M. Gmitra et al., Phys. Rev. B 93, 155104 (2016)

[3] Z. Wang et al., Nat. Commun. 6, 8339 (2015)

[4] K.-H. Jin and S.-H. Jhi, Phys. Rev. B 87, 075442 (2013)

[5] P. Lee et al., ACS Nano 9, 10861 (2015)

[6] A.W. Cummings et al., Phys. Rev. Lett. 119, 206601 (2017)

[7] K. Song et al., Nano Lett. 18, 2033 (2018)

Contact : alessandro.cresti@grenoble-inp.fr

Discipline évènement : (Physique)
Entité organisatrice : (IMEP/LAHC)
Nature évènement : (Séminaire)
Site de l'évènement : Site CEA sans badge requis

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