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CAMP Seminar: Spintronics with graphene and 2d heterostructures

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Jaroslav Fabian, University of Regensburg
When
04 October 2016 from 3:30 PM to 4:30 PM
Where
339 Davey Laboratory
Contact Name
Jun Zhu
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Graphene and novel 2d materials offer new perspectives for spintronics [1]. Graphene can reach spin lifetimes of 1-10 ns, limited currently by resonant spin flips off magnetic moments, the mechanism that we proposed [2]. However, graphene has no band gap, so its spintronic applications will be limited as a highly efficient spin transfer channel. Heterostructures of graphene and two-dimensional transition-metal dichalcogenides (TMDC) are emerging as systems in which both orbital and spin properties can be controlled by gating, thus offering a material basis for spintronic applications. We have proposed that graphene on TMDCs can be used in optospintronics [3], since the direct gap of TMDCs allows optical spin orientation, with the successive transfer of spin into graphene. But these van der Waals stacks also yield interesting fundamental physics. We have recently shown that graphene on WSe2 exhibits an inverted band structure, which leads to the quantum spin Hall effect in graphene nanoribbons on WSe2 [4]. In the talk I will also mention our most recent results on engineering the proximity exchange in graphene and TMDCs in tunnel junctions with ferromagnetic metals.

 

1. W. Han, R. Kawakami, M. Gmitra, and J. Fabian, Nature Nanotechnology 9, 794 (2014)
2. D. Kochan, S. Irmer, M. Gmitra, and J. Fabian, Phys. Rev. Lett. 115, 196601 (2015)

3. M. Gmitra and J. Fabian, Phys. Rev. B 92, 155403 (2015)

4. M. Gmitra, D. Kochan, P. Högl, and J. Fabian, Phys. Rev. B 93, 155104 (2016)

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