Calibrated Quantification of the Dark-Exciton Reservoir via a k-Space-Folding Probe
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2026
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866917239715790848 |
|---|---|
| author | Dai, Guangyu Zhang, Xinyu Gu, Zhaoqi Zhang, Junyuan Dou, Lin Yu, Jiaxin Gu, Fuxing |
| author_facet | Dai, Guangyu Zhang, Xinyu Gu, Zhaoqi Zhang, Junyuan Dou, Lin Yu, Jiaxin Gu, Fuxing |
| contents | Spin-forbidden dark excitons in monolayer transition metal dichalcogenides constitute a dominant hidden reservoir that governs exciton dynamics and many-body interactions. Yet determining the population distribution within this reservoir remains challenging because detected brightness conflates radiative-rate modification with collection efficiency, obscuring the link between intensity and population. Here we make this inverse problem well posed by calibrating the position- and orientation-resolved detection response. Combining microsphere-enabled k-space folding with Green-tensor quasinormal-mode calibration, we decouple radiative-rate modification from collection efficiency. We extract a room-temperature dark-to-bright population ratio ND/NB = 4.3, consistent with a near-thermalized manifold under continuous-wave excitation. This calibrated population metric provides a quantitative thermodynamic benchmark for the dark reservoir and interaction-driven 2D exciton phases. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_01324 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Calibrated Quantification of the Dark-Exciton Reservoir via a k-Space-Folding Probe Dai, Guangyu Zhang, Xinyu Gu, Zhaoqi Zhang, Junyuan Dou, Lin Yu, Jiaxin Gu, Fuxing Optics Spin-forbidden dark excitons in monolayer transition metal dichalcogenides constitute a dominant hidden reservoir that governs exciton dynamics and many-body interactions. Yet determining the population distribution within this reservoir remains challenging because detected brightness conflates radiative-rate modification with collection efficiency, obscuring the link between intensity and population. Here we make this inverse problem well posed by calibrating the position- and orientation-resolved detection response. Combining microsphere-enabled k-space folding with Green-tensor quasinormal-mode calibration, we decouple radiative-rate modification from collection efficiency. We extract a room-temperature dark-to-bright population ratio ND/NB = 4.3, consistent with a near-thermalized manifold under continuous-wave excitation. This calibrated population metric provides a quantitative thermodynamic benchmark for the dark reservoir and interaction-driven 2D exciton phases. |
| title | Calibrated Quantification of the Dark-Exciton Reservoir via a k-Space-Folding Probe |
| topic | Optics |
| url | https://arxiv.org/abs/2602.01324 |