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  Nanometer-scale lateral p-n junctions in graphene/α-RuCl3 heterostructures

Rizzo, D. J., Shabani, S., Jessen, B. S., Zhang, J., McLeod, A. S., Rubio-Verdú, C., et al. (2021). Nanometer-scale lateral p-n junctions in graphene/α-RuCl3 heterostructures.

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2111.06933.pdf (Preprint), 2MB
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https://arxiv.org/abs/2111.06933 (Preprint)
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 Creators:
Rizzo, D. J.1, Author
Shabani, S.1, Author
Jessen, B. S.1, 2, Author
Zhang, J.3, 4, Author              
McLeod, A. S.1, Author
Rubio-Verdú, C.1, Author
Ruta, F. L.1, 5, Author
Cothrine, M.6, Author
Yan, J.6, 7, Author
Mandrus, D. G.6, 7, Author
Nagler, S. E.8, Author
Rubio, A.3, 4, 9, 10, Author              
Hone, J. C.3, 4, Author
Dean, C. R.1, Author
Pasupathy, A. N.1, 11, Author
Basov, D. N.1, Author
Affiliations:
1Department of Physics, Columbia University, New York, ou_persistent22              
2Department of Mechanical Engineering, Columbia University, New York, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              
4Center for Free-Electron Laser Science, ou_persistent22              
5Department of Applied Physics and Applied Mathematics, Columbia University, New York, ou_persistent22              
6Department of Materials Science and Engineering, University of Tennessee, Knoxville, ou_persistent22              
7Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, ou_persistent22              
8Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, ou_persistent22              
9Center for Computational Quantum Physics, Flatiron Institute, New York, ou_persistent22              
10Nano-Bio Spectroscopy Group, Universidad del País Vasco UPV/EHU, ou_persistent22              
11Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, ou_persistent22              

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Free keywords: Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Materials Science, cond-mat.mtrl-sci, Physics, Optics, physics.optics
 Abstract: The ability to create high-quality lateral p-n junctions at nanometer length scales is essential for the next generation of two-dimensional (2D) electronic and plasmonic devices. Using a charge-transfer heterostructure consisting of graphene on α-RuCl3 , we conduct a proof-of-concept study demonstrating the existence of intrinsic nanoscale lateral p-n junctions in the vicinity of graphene nanobubbles. Our multi-pronged experimental approach incorporates scanning tunneling microscopy (STM) and spectroscopy (STS) and scattering-type scanning near-field optical microscopy (s-SNOM) in order to simultaneously probe both the electronic and optical responses of nanobubble p-n junctions. Our STM and STS results reveal that p-n junctions with a band offset of more than 0.6 eV can be achieved over lateral length scale of less than 3 nm, giving rise to a staggering effective in-plane field in excess of 108 V/m. Concurrent s-SNOM measurements confirm the utility of these nano-junctions in plasmonically-active media, and validate the use of a point-scatterer formalism for modeling surface plasmon polaritons (SPPs). Model ab initio density functional theory (DFT) calculations corroborate our experimental data and reveal a combination of sub-angstrom and few-angstrom decay processes dictating the dependence of charge transfer on layer separation. Our study provides experimental and conceptual foundations for the use of charge-transfer interfaces such as graphene/α-RuCl3 to generate p-n nano-junctions.

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Language(s): eng - English
 Dates: 2021-11-12
 Publication Status: Published online
 Pages: 37
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2111.06933
 Degree: -

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