Abstract
We report the first observation of photoluminescence from excitonic Rydberg states with quantum number n up to 7 in Cu2O. We find that the luminescence linewidths increase at elevated temperatures and under increased laser power, and that the effect is more pronounced for a state with a larger n. The temperature dependence is attributed to scattering by longitudinal-optical phonons, whereas the density dependence is explained by the binary collisions of excitons in the ground (n=1) and excited (n≥2) Rydberg states. The n-dependent broadening is discussed on the basis of the overlap of wave functions and collision cross sections determined by the Bohr radius of Rydberg excitons.
Original language | English |
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Pages (from-to) | 808-813 |
Number of pages | 6 |
Journal | Journal of Luminescence |
Volume | 192 |
DOIs | |
Publication status | Published - 2017 Dec 1 |
Externally published | Yes |
Keywords
- Excitonic Rydberg states
- Line broadening
- Photoluminescence
ASJC Scopus subject areas
- Biophysics
- Atomic and Molecular Physics, and Optics
- Chemistry(all)
- Biochemistry
- Condensed Matter Physics