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Evidence for charge transfer and proximate magnetism in graphene/a-RuCl_3 heterostructures
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abstract
We report a study of electronic transport in van der Waals heterostructures composed of flakes of the antiferromagnetic Mott insulator a-RuCl_3 placed on top of monolayer graphene Hall bars. While the zero-field transport shows a strong resemblance to that of isolated graphene, we find a consistently $p$-type Hall effect suggestive of multiband conduction, along with a non-monotonic and gate-voltage-dependent excursion of the resistivity at low temperatures that is reminiscent of transport in the presence of a magnetic phase transition. We interpret these data as evidence for charge transfer from graphene to a-RuCl_3 in an inhomogeneous device yielding both highly- and lightly-doped regions of graphene, while the latter shows a particular sensitivity to magnetism in the a-RuCl_3. Thus proximity to graphene is a means to access magnetic properties of thin layers of magnetic insulators.
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Electronic properties of {\alpha}-RuCl3 in proximity to graphene
In α-RuCl3/graphene heterostructures, DFT calculations predict charge transfer and tensile strain that metallize α-RuCl3 and enhance its Kitaev coupling by more than 50% compared with bulk.
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