Evidence for charge transfer and proximate magnetism in graphene–α–RuCl3 heterostructures

Zhou, Boyi; Balgley, J.; Lampen-Kelley, Paula; Yan, Jiaqiang; Mandrus, David G.; Henriksen, Erik A.

doi:10.1103/physrevb.100.165426

Title: Evidence for charge transfer and proximate magnetism in graphene– $α – {RuCl}_{3}$ heterostructures

Journal Article · Mon Oct 28 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.165426· OSTI ID:1761719

Zhou, Boyi ^[1]; Balgley, J. ^[1]; Lampen-Kelley, Paula ^[2];

^[2]; Mandrus, David G. ^[2];

^[1]

Washington Univ., St. Louis, MO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States)

We report a study of electronic transport in van der Waals heterostructures composed of flakes of the antiferromagnetic Mott insulator $α – {RuCl}_{3}$ 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 nonmonotonic 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 $α – {RuCl}_{3}$ in an inhomogeneous device yielding both highly and lightly doped regions of graphene, while the latter shows a particular sensitivity to magnetism in the $α – {RuCl}_{3}$ . Thus proximity to graphene is a means to access magnetic properties of thin layers of magnetic insulators.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); Gordon and Betty Moore Foundation

Grant/Contract Number:: AC05-00OR22725; DMR-1810305; GBMF4416

OSTI ID:: 1761719

Journal Information:: Physical Review B, Vol. 100, Issue 16; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Evidence for charge transfer and proximate magnetism in graphene– α – RuCl 3 heterostructures

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Title: Evidence for charge transfer and proximate magnetism in graphene– $α – {RuCl}_{3}$ heterostructures