Electrically tunable layer-hybridized trions in doped WSe2 bilayers

Raul Perea-Causin (), Samuel Brem, Fabian Buchner, Yao Lu, Kenji Watanabe, Takashi Taniguchi, John M. Lupton, Kai-Qiang Lin () and Ermin Malic ()
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Raul Perea-Causin: Chalmers University of Technology
Samuel Brem: Philipps-Universität Marburg
Fabian Buchner: University of Regensburg
Yao Lu: College of Chemistry and Chemical Engineering, Xiamen University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
John M. Lupton: University of Regensburg
Kai-Qiang Lin: University of Regensburg
Ermin Malic: Philipps-Universität Marburg

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract 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 tunability 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 $$\Lambda$$ 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 arising 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.

Date: 2024
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DOI: 10.1038/s41467-024-50834-8

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