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

Boyi Zhou; J. Balgley; P. Lampen-Kelley; J. Q. Yan; D. G. Mandrus; E. A. Henriksen

doi:10.1103/PhysRevB.100.165426

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

Boyi Zhou, J. Balgley, P. Lampen-Kelley, J. Q. Yan, D. G. Mandrus, E. A. Henriksen

Correlated Electron Materials

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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 α-RuCl3 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-RuCl3 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-RuCl3. Thus proximity to graphene is a means to access magnetic properties of thin layers of magnetic insulators.

Original language	English
Article number	165426
Journal	Physical Review B
Volume	100
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.100.165426
State	Published - Oct 28 2019

Funding

We wish to thank A. Banerjee, S. Biswas, E. Gerber, E.-A. Kim, A. MacDonald, S. Nagler, R. Valenti, and J. van den Brink for informative discussions. We acknowledge support from the Institute of Materials Science and Engineering at Washington University in St. Louis. E.A.H., B.Z., and J.B. acknowledge support under Grant No. NSF DMR-1810305. D.G.M. and P.L.-K. acknowledge support from the Gordon and Betty Moore Foundation EPiQS Initiative through Grant No. GBMF4416.

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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 α-RuCl3 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-RuCl3 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-RuCl3. Thus proximity to graphene is a means to access magnetic properties of thin layers of magnetic insulators.",

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AU - Mandrus, D. G.

AU - Henriksen, E. A.

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

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