Revealing dark exciton signatures in polariton spectra of 2D materials
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
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| _version_ | 1866910291913080832 |
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| author | Ferreira, Beatriz Shan, Hangyong Rosati, Roberto Fitzgerald, Jamie M. Lackner, Lukas Han, Bo Esmann, Martin Hays, Patrick Liebling, Gilbert Watanabe, Kenji Taniguchi, Takashi Eilenberger, Falk Tongay, Sefaattin Schneider, Christian Malic, Ermin |
| author_facet | Ferreira, Beatriz Shan, Hangyong Rosati, Roberto Fitzgerald, Jamie M. Lackner, Lukas Han, Bo Esmann, Martin Hays, Patrick Liebling, Gilbert Watanabe, Kenji Taniguchi, Takashi Eilenberger, Falk Tongay, Sefaattin Schneider, Christian Malic, Ermin |
| contents | Dark excitons in transition metal dichalcogenides (TMD) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetically lowest states and could thus provide important scattering partners for polaritons. In this joint theory-experiment work, we investigate the impact of the full exciton energy landscape on polariton absorption and reflectance. By changing the cavity detuning, we vary the polariton energy relative to the unaffected dark excitons in such a way that we open or close specific phonon-driven scattering channels. We demonstrate both in theory and experiment that this controlled switching of scattering channels manifests in characteristic sharp changes in optical spectra of polaritons. These spectral features can be exploited to extract the position of dark excitons. Our work suggests new possibilities for exploiting polaritons for fingerprinting nanomaterials via their unique exciton landscape. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04588 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Revealing dark exciton signatures in polariton spectra of 2D materials Ferreira, Beatriz Shan, Hangyong Rosati, Roberto Fitzgerald, Jamie M. Lackner, Lukas Han, Bo Esmann, Martin Hays, Patrick Liebling, Gilbert Watanabe, Kenji Taniguchi, Takashi Eilenberger, Falk Tongay, Sefaattin Schneider, Christian Malic, Ermin Mesoscale and Nanoscale Physics Materials Science Dark excitons in transition metal dichalcogenides (TMD) have been so far neglected in the context of polariton physics due to their lack of oscillator strength. However, in tungsten-based TMDs, dark excitons are known to be the energetically lowest states and could thus provide important scattering partners for polaritons. In this joint theory-experiment work, we investigate the impact of the full exciton energy landscape on polariton absorption and reflectance. By changing the cavity detuning, we vary the polariton energy relative to the unaffected dark excitons in such a way that we open or close specific phonon-driven scattering channels. We demonstrate both in theory and experiment that this controlled switching of scattering channels manifests in characteristic sharp changes in optical spectra of polaritons. These spectral features can be exploited to extract the position of dark excitons. Our work suggests new possibilities for exploiting polaritons for fingerprinting nanomaterials via their unique exciton landscape. |
| title | Revealing dark exciton signatures in polariton spectra of 2D materials |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2401.04588 |