Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$
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arXiv
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912348750479360 |
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| author | Feng, Shun Campbell, Aidan J. Francis, Bibi Mary Baek, Hyeonjun Taniguchi, Takashi Watanabe, Kenji Gerber, Iann C. Gerardot, Brian D. Brotons-Gisbert, Mauro |
| author_facet | Feng, Shun Campbell, Aidan J. Francis, Bibi Mary Baek, Hyeonjun Taniguchi, Takashi Watanabe, Kenji Gerber, Iann C. Gerardot, Brian D. Brotons-Gisbert, Mauro |
| contents | We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of 2$H$-stacked bilayer MoSe$_2$. The application of a vertical electric field results in a quadratic energy redshift of these quadrupolar excitons, in contrast to the linear energy splitting observed in the coexisting dipolar excitons within the bilayer MoSe$_2$. We perform helicity-resolved reflectance contrast measurements to investigate the spin and valley configurations of the quadrupolar exciton states as a function of applied vertical electric and magnetic fields. Comparing our results with a phenomenological coupled-oscillator model indicates that the electric- and magnetic-field dependence of the quadrupolar exciton states can be attributed to the intravalley and intervalley hybridization of spin-triplet interlayer excitons with opposite permanent dipole moments, mediated by interlayer hole tunneling. These results position naturally stacked MoSe$_2$ bilayers as a promising platform to explore electric-field-tunable many-body exciton phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_19883 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$ Feng, Shun Campbell, Aidan J. Francis, Bibi Mary Baek, Hyeonjun Taniguchi, Takashi Watanabe, Kenji Gerber, Iann C. Gerardot, Brian D. Brotons-Gisbert, Mauro Mesoscale and Nanoscale Physics We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of 2$H$-stacked bilayer MoSe$_2$. The application of a vertical electric field results in a quadratic energy redshift of these quadrupolar excitons, in contrast to the linear energy splitting observed in the coexisting dipolar excitons within the bilayer MoSe$_2$. We perform helicity-resolved reflectance contrast measurements to investigate the spin and valley configurations of the quadrupolar exciton states as a function of applied vertical electric and magnetic fields. Comparing our results with a phenomenological coupled-oscillator model indicates that the electric- and magnetic-field dependence of the quadrupolar exciton states can be attributed to the intravalley and intervalley hybridization of spin-triplet interlayer excitons with opposite permanent dipole moments, mediated by interlayer hole tunneling. These results position naturally stacked MoSe$_2$ bilayers as a promising platform to explore electric-field-tunable many-body exciton phenomena. |
| title | Quadrupolar and Dipolar Excitons in Bilayer 2$H$-MoSe$_2$ |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.19883 |