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説明:

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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Landauer resistivity dipole (LRD)
, photocurrent nanoscopy, graphene interface

刊行年月日: 2025-05-28

出版者: American Chemical Society (ACS)

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2026-03-10 12:30:12 +0900

MDRでの公開時刻: 2026-03-10 09:03:18 +0900