Article Direct Visualization of the Charge Transfer in a Graphene/α-RuCl3 Heterostructure via Angle-Resolved Photoemission Spectroscopy

Antonio Rossi ; Cameron Johnson ; Jesse Balgley ; John C. Thomas ; Luca Francaviglia ; Riccardo Dettori ; Andreas K. Schmid ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Matthew Cothrine ; David G. Mandrus ; Chris Jozwiak ; Aaron Bostwick ; Erik A. Henriksen ; Alexander Weber-Bargioni ; Eli Rotenberg

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Antonio Rossi, Cameron Johnson, Jesse Balgley, John C. Thomas, Luca Francaviglia, Riccardo Dettori, Andreas K. Schmid, Kenji Watanabe, Takashi Taniguchi, Matthew Cothrine, David G. Mandrus, Chris Jozwiak, Aaron Bostwick, Erik A. Henriksen, Alexander Weber-Bargioni, Eli Rotenberg. Direct Visualization of the Charge Transfer in a Graphene/α-RuCl3 Heterostructure via Angle-Resolved Photoemission Spectroscopy. Nano Letters. 2023, 23 (17), 8000-8005. https://doi.org/10.1021/acs.nanolett.3c01974
SAMURAI

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(abstract)

We investigate the electronic properties of a graphene and α-ruthenium trichloride (α-RuCl3) heterostructure, using a combination of experimental and theoretical techniques. α-RuCl3 is a Mott insulator and a Kitaev material, and its combination with graphene has gained increasing attention due to its potential applicability in novel electronic and optoelectronic devices. By using a combination of spatially resolved photoemission spectroscopy, low energy electron microscopy, and density functional theory (DFT) calculations we are able to provide a first direct visualization of the massive charge transfer from graphene to α-RuCl3, which can modify the electronic properties of both materials, leading to novel electronic phenomena at their interface. The electronic band structure is compared to DFT calculations that confirm the occurrence of a Mott transition for α-RuCl3. Finally, a measurement of spatially resolved work function allows for a direct estimate of the interface dipole between graphene and α-RuCl3. The strong coupling between graphene and α-RuCl3 could lead to new ways of manipulating electronic properties of two-dimensional lateral heterojunction. Understanding the electronic properties of this structure is pivotal for designing next generation low-power opto-electronics devices.

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Keyword: Graphene, α-ruthenium trichloride, electronic properties

Date published: 2023-09-13

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 23 issue. 17 p. 8000-8005

Funding:

  • Lawrence Livermore National Laboratory DE-AC52-07NA27344
  • Gordon and Betty Moore Foundation 11560
  • Basic Energy Sciences
  • Horizon 2020 Framework Programme 881603
  • Under Secretary of Defense for Research and Engineering FA9550-22-1-0340

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1021/acs.nanolett.3c01974

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Updated at: 2025-02-26 12:31:14 +0900

Published on MDR: 2025-02-26 12:31:14 +0900

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