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Doped van der Waals heterostructures host layer-hybridized trions, i.e. charged excitons with layer-delocalized constituents holding promise for highly controllable optoelectronics. Combining a microscopic theory with photoluminescence (PL) experiments, we demonstrate the electrical tunabil- ity of the trion energy landscape in naturally stacked WSe2 bilayers. We show that an out-of-plane electric field modifies the energetic ordering of the lowest lying trion states, which consist of layer- hybridized Λ-point electrons and layer-localized K-point holes. At small fields, intralayer-like trions yield distinct PL signatures in opposite doping regimes characterized by weak Stark shifts in both cases. Above a doping-asymmetric critical field, interlayer-like species are energetically favored and produce PL peaks with a pronounced Stark red-shift and a counter-intuitively large intensity aris- ing from efficient phonon-assisted recombination. Our work presents an important step forward in the microscopic understanding of layer-hybridized trions in van der Waals heterostructures and paves the way towards optoelectronic applications based on electrically controllable atomically-thin semiconductors.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Van der Waals heterostructures, trions, photoluminescence

刊行年月日: 2024-08-07

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 6713

研究助成金:

• Ministry of Education, Culture, Sports, Science and Technology JSPS KAKENHI (21H05233)
• Ministry of Education, Culture, Sports, Science and Technology JSPS KAKENHI (23H02052)
• Deutsche Forschungsgemeinschaft SFB 1277 (B11 314695032)
• Deutsche Forschungsgemeinschaft SPP 2244 (443378379)
• Deutsche Forschungsgemeinschaft SFB 1083 - 542873285

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-50834-8

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更新時刻: 2025-02-05 12:31:41 +0900

MDRでの公開時刻: 2025-02-05 12:31:42 +0900