تقرير
Electrically tunable dipolar interactions between layer-hybridized excitons
| العنوان: | Electrically tunable dipolar interactions between layer-hybridized excitons |
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| المؤلفون: | Erkensten, Daniel, Brem, Samuel, Perea-Causin, Raul, Hagel, Joakim, Tagarelli, Fedele, Lopriore, Edoardo, Kis, Andras, Malic, Ermin |
| المصدر: | Nanoscale, 2023 |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | Transition-metal dichalcogenide bilayers exhibit a rich exciton landscape including layer-hybridized excitons, i.e. excitons which are of partly intra- and interlayer nature. In this work, we study hybrid exciton-exciton interactions in naturally stacked WSe$_2$ homobilayers. In these materials, the exciton landscape is electrically tunable such that the low-energy states can be rendered more or less interlayer-like depending on the strength of the external electric field. Based on a microscopic and material-specific many-particle theory, we reveal two intriguing interaction regimes: a low-dipole regime at small electric fields and a high-dipole regime at larger fields, involving interactions between hybrid excitons with a substantially different intra- and interlayer composition in the two regimes. While the low-dipole regime is characterized by weak inter-excitonic interactions between intralayer-like excitons, the high-dipole regime involves mostly interlayer-like excitons which display a strong dipole-dipole repulsion and give rise to large spectral blue-shifts and a highly anomalous diffusion. Overall, our microscopic study sheds light on the remarkable electrical tunability of hybrid exciton-exciton interactions in atomically thin semiconductors and can guide future experimental studies in this growing field of research. Comment: 8+8 pages, 4+2 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1039/D3NR01049J |
| URL الوصول: | http://arxiv.org/abs/2305.01845 |
| رقم الأكسشن: | edsarx.2305.01845 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1039/D3NR01049J |
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