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arXiv · 1709.01961

Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures

Jose H. Garcia·Aron W. Cummings·Stephan Roche
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Abstract

We report on a theoretical study of the spin Hall Effect (SHE) and weak antilocal-ization (WAL) in graphene/transition metal dichalcogenide (TMDC) heterostructures, computed through efficient real-space quantum transport methods, and using realistic tight-binding models parametrized from ab initio calculations. The graphene/WS 2 system is found to maximize spin proximity effects compared to graphene on MoS 2 , WSe 2 , or MoSe 2 , with a crucial role played by disorder, given the disappearance of SHE signals in the presence of strong intervalley scattering. Notably, we found that stronger WAL effects are concomitant with weaker charge-to-spin conversion efficiency. For further experimental studies of graphene/TMDC heterostructures, our findings provide guidelines for reaching the upper limit of spin current formation and for fully harvesting the potential of two-dimensional materials for spintronic applications.

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Jose H. Garcia, Aron W. Cummings, Stephan Roche. 2017-09-06. Spin Hall effect and Weak Antilocalization in Graphene/Transition Metal Dichalcogenide Heterostructures. https://doi.org/10.1021/acs.nanolett.7b02364

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