Article Landauer Resistivity Dipole at One-Dimensional Defect Revealed via near-Field Photocurrent Nanoscopy

Francesca Falorsi ; Marco Dembecki ; Christian Eckel ; Monica Kolek Martinez de Azagra ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Martin Statz ; R. Thomas Weitz

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Francesca Falorsi, Marco Dembecki, Christian Eckel, Monica Kolek Martinez de Azagra, Kenji Watanabe, Takashi Taniguchi, Martin Statz, R. Thomas Weitz. Landauer Resistivity Dipole at One-Dimensional Defect Revealed via near-Field Photocurrent Nanoscopy. Nano Letters. 2025, 25 (21), 8495-8502. https://doi.org/10.1021/acs.nanolett.5c00437

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(abstract)

The fundamental question how to describe Ohmic resistance at the nanoscale has been answered by Landauer in his seminal picture of the so-called Landauer resistivity dipole. This picture has been theoretically well understood, however experimentally there are only few studies due to the need for a non-invasive local probe. Here we use the nanometer lateral resolution of near-field photocurrent imaging to thoroughly characterize a buried monolayer – bilayer graphene interface as an ideal one dimensional defect for the Landauer resistivity dipole. Via systematic tuning of the overall charge carrier density and the current flow we are able to detect the formation of Landauer resistivity dipoles due to charge carrier accumulation around the one dimensional defects. We found that, for Fermi energy values near the charge neutrality point (i.e. at low hole or electron doping), the photocurrent exhibits the same polarity as the applied source-drain voltage, which is consistent with changes in carrier concentration induced by the Landauer resistivity dipoles. This signature is no longer evident at higher charge carrier density in agreement with the performed numerical calculations. Photocurrent nanoscopy can thus serve as non-invasive technique to study local dissipation at hidden interfaces.

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Keyword: Landauer resistivity dipole (LRD)
, photocurrent nanoscopy, graphene interface

Date published: 2025-05-28

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 25 issue. 21 p. 8495-8502

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology
  • Deutsche Forschungsgemeinschaft SFB 1073 B10
  • Deutsche Forschungsgemeinschaft SFB 1073 A05
  • Deutsche Forschungsgemeinschaft SPP 2244
  • Core Research for Evolutional Science and Technology JPMJCR24A5
  • Center for NanoScience, Ludwig-Maximilians-Universit?t M?nchen
  • Japan Society for the Promotion of Science 21H05233
  • Japan Society for the Promotion of Science 23H02052
  • NIM Nanosystems Initiative Munich

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

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First published URL: https://doi.org/10.1021/acs.nanolett.5c00437

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Updated at: 2026-03-10 12:30:12 +0900

Published on MDR: 2026-03-10 09:03:18 +0900

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