Ultra-sharp lateral p-n junctions in modulation-doped graphene

  • We demonstrate ultra-sharp (≲10 nm) lateral p-n junctions in graphene using electronic transport, scanning tunneling microscopy, and first principles calculations. The p-n junction lies at the boundary between differentially-doped regions of a graphene sheet, where one side is intrinsic and the other is charge-doped by proximity to a flake of α-RuCl3 across a thin insulating barrier. We extract the p-n junction contribution to the device resistance to place bounds on the junction width. We achieve an ultra-sharp junction when the boundary between the intrinsic and doped regions is defined by a cleaved crystalline edge of α-RuCl3 located 2 nm from the graphene. Scanning tunneling spectroscopy in heterostructures of graphene, hexagonal boron nitride, and α-RuCl3 shows potential variations on a sub-10 nm length scale. First principles calculations reveal the charge-doping of graphene decays sharply over just nanometers from the edge of the α-RuCl3 flake.

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Metadaten
Author:Jesse BalgleyORCiD, Jackson ButlerORCiD, Sananda BiswasORCiD, Zhehao Ge, Samuel LaGasseORCiD, Takashi TaniguchiORCiD, Kenji WatanabeORCiD, Matthew CothrineORCiD, David G. MandrusORCiD, Jairo VelascoORCiD, Roser ValentíORCiDGND, Erik A. HenriksenORCiD
URN:urn:nbn:de:hebis:30:3-824648
URL:https://arxiv.org/abs/2203.06295v2
DOI:https://doi.org/10.48550/arXiv.2203.06295
ArXiv Id:http://arxiv.org/abs/2203.06295v2
Parent Title (English):arXiv
Publisher:arXiv
Document Type:Preprint
Language:English
Date of Publication (online):2022/05/31
Date of first Publication:2022/05/31
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/20
Tag:density functional theory; electronic transport; graphene; p-n junction; scanning tunneling microscopy; α-RuCl3
Issue:2203.06295 Version 2
Edition:Version 2
Page Number:36
HeBIS-PPN:516989561
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0