Theoretical Physics

17 February 2016
Time: 15:00 to 16:00
Location: EC Stoner 8.60

Theoretical Physics Seminar: Speaker: Aires Ferreira (University of York)

EC Stoner 8.60, Wednesday Feb 17 @ 3pm

Towards all-electric spintronics in graphene

Recent reports of sizeable spin–orbit coupling in chemically modified graphene have paved the way for all-electric spintronics in two-dimensional carbon platforms [1]. In this talk, I will overview the progress on spin Hall effect engineering in functionalized graphene [2-3], and discuss the implications of recent findings [4,5]. The main focus will be on spin–orbit coupled graphene obtained via chemisorption of light species and proximity effect to heavy adatoms. I will show theoretically how sharp electron—adatom scattering processes can enable an efficient spin Hall current generation (spin Hall angles of the order of 10% [3]) with a low impact on spin relaxation times, making spin–orbit-coupled graphene a promising candidate for processing of neutral spin currents. Last, I will present a new scheme for spin-current routing based on the distortion of Dirac cones in graphene superlattices [5]. The implications for experiments will be discussed.



[1] Marchenko, D. et al. Nat. Comm. 3, 1232 (2012); Balakrishnan, J. et al. Nat. Phys. 9, 284 (2013)

[2] Balakrishnan, J. et al. Nat. Comm. 5, 4748 (2014); Avsar, M. et al. ibidem, 4875 (2014)

[3] Ferreira, A. et al. Phys. Rev. Lett. 112, 066601 (2014); Pachoud, A. et al. Phys. Rev. B 90, 035444 (2014)

[4] Stabile, A. et al. Phys. Rev. B 92, 121411(R) (2015)

[5] Martelo, L., and Ferreira, A. (unpublished)



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