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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2404.18716 |
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| _version_ | 1866916349107765248 |
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| author | Perea-Causin, Raul Brem, Samuel Buchner, Fabian Lu, Yao Watanabe, Kenji Taniguchi, Takashi Lupton, John M. Lin, Kai-Qiang Malic, Ermin |
| author_facet | Perea-Causin, Raul Brem, Samuel Buchner, Fabian Lu, Yao Watanabe, Kenji Taniguchi, Takashi Lupton, John M. Lin, Kai-Qiang Malic, Ermin |
| contents | 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 WSe$_2$ 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 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_18716 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electrically tunable layer-hybridized trions in doped WSe$_2$ bilayers Perea-Causin, Raul Brem, Samuel Buchner, Fabian Lu, Yao Watanabe, Kenji Taniguchi, Takashi Lupton, John M. Lin, Kai-Qiang Malic, Ermin Mesoscale and Nanoscale Physics 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 WSe$_2$ 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 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. |
| title | Electrically tunable layer-hybridized trions in doped WSe$_2$ bilayers |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2404.18716 |