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説明:

The control of elastic and inelastic electron tunneling relies on materials with well defined interfaces. Van der Waals materials made of two-dimensional constituents form an ideal platform for such studies. Signatures of acoustic phonons and defect states have been observed in current-to-voltage (I–V ) measurements. These features can be explained by direct electron-phonon or electron-defect interactions. Here we demonstrate a novel two-step tunneling process, involving both phonons and excitons. We use tunnel junctions consisting of graphene and gold electrodes separated by hexagonal boron nitride (hBN) barriers with adjacent transition metal dichalcogenide (TMD) monolayers and observe prominent resonant features in I–V measurements. These resonances appear at bias voltages that correspond to TMD exciton energies and are accompanied by excitonic light emission. By placing the TMD outside of the tunneling pathway we demonstrate that this phonon-exciton mediated tunneling process does not require any charge injection into the TMD. This work demonstrates the appearance of optical modes in electrical transport measurements and introduces a new functionality for optoelectronic devices based on van der Waals materials.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Elastic and inelastic electron tunnelling, van der Waals materials, tunnelling process

刊行年月日: 2023-06-26

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Materials (ISSN: 14764660) vol. 22 issue. 9 p. 1094-1099

研究助成金:

• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 200020_192362
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung PCEFP2_203663
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 189924 (Hydronics)
• MEXT | Japan Society for the Promotion of Science KAKENHI 19H0579019H05790, 20H00354 and 21H05233
• MEXT | Japan Society for the Promotion of Science KAKENHI 19H0579019H05790, 20H00354 and 21H05233
• Generalitat de Catalunya CERCA and AGAUR

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41563-023-01556-7

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更新時刻: 2025-02-28 08:30:51 +0900

MDRでの公開時刻: 2025-02-28 08:30:51 +0900