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説明:

While it’s long been accepted that the role of momentum dark excitons in the photoresponse of transition metal dichalcogenides (TMD’s) is critical, their weak optical signature has made any observation confined to cryogenic conditions. Here we surpass this limit, and expose the room temperature contributions of both bright and dark excitons to the behaviour of a TMD, WSe2, from monolayer to multilayer to bulk. To do so, we present dual action spectroscopy, a photocurrent and luminescence detected Fourier-transform excitation spectroscopy scheme to microscopically map the energy landscape of WSe2. While bright excitons naturally dominate the luminescence response of the material, dark excitons dominate the current response. Notably, the dark KK' exciton is more accessible than the ground state KΛ, while the current maps reveal a disparity in the diffusivity of the two states. This work provides the basis for a new current-detected approach to study the dynamics of dark exciton states across different materials.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: dual action spectroscopy
, bright and dark excitons
, WSe2

刊行年月日: 2025-05-14

出版者: American Chemical Society (ACS)

掲載誌:

• Nano Letters (ISSN: 15306984) vol. 25 issue. 19 p. 7658-7664

研究助成金:

• Fundaci?n Cellex
• European Research Council 101054846
• FUNDACI? Privada MIR-PUIG
• Ministerio de Ciencia, Innovaci?n y Universidades CEX2019-000910-S
• Ministerio de Ciencia, Innovaci?n y Universidades PID2021- 123814OB-I00
• Ministerio de Ciencia, Innovaci?n y Universidades TED2021-129241BI00
• Generalitat de Catalunya
• Fundaci? Joan Ribas Araquistain

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1021/acs.nanolett.4c06349

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更新時刻: 2026-02-17 08:30:29 +0900

MDRでの公開時刻: 2026-02-16 18:00:51 +0900