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Giant spin lifetime anisotropy in graphene/TMDC heterostructures

AuthorsCummings, Aron W.; García, J. H.; Fabian, Jaroslav; Roche, Stephan
Issue Date2017
Citation1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics" (2017)
AbstractGraphene is a promising material for spintronics, as its weak spin-orbit coupling (SOC) and high electron mobility allow it to transport spin over long distances. However, this also prevents graphene from being useful for active spintronics, where strong SOC is needed to create and manipulate spin currents. To this end, interfacing with high-SOC materials such as transition metal dichalcogenides (TMDCs) is seen as a promising route to enable spin manipulation in graphene while maintaining its superior charge transport properties. In this work, we present a theoretical treatment of spin transport and relaxation in graphene/TMDC heterostructures. Using dissipative quantum spin dynamics arguments, and quantum mechanical numerical simulations, we show that the spin transport can be highly anisotropic, with the ratio of the lifetime of out-of-plane spins to that of in-plane spins, ϛ Ξ ts / tIIs , reaching values of tens to hundreds. This is mediated by a strong spin-valley locking that is imprinted onto the graphene by the TMDC. Traditional 2D systems with Rashba SOC yield ϛ=1/2 , while measurements of graphene on SiO2 substrates yield ϛ=1. This giant spin lifetime anisotropy thus represents a qualitatively new regime of spin relaxation in graphene, and should exist in other 2D materials with strong spin-valley locking, including TMDCs themselves. Subsequent experimental measurements have confirmed this behavior, at low temperature and at room temperature for graphene interfaced with a variety of different TMDCs, indicating the universality and robustness of this new mechanism of spin relaxation.
DescriptionResumen del póster presentado al 1st Workshop Spain-Taiwan: "2D Materials and Interfaces for Spintronics", celebrado en Barcelona (España) del 23 al 25 de octubre de 2017.
Appears in Collections:(CIN2) Comunicaciones congresos
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