TY - JOUR
T1 - Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide
AU - Kitamura, Tatsuya
AU - Takahata, Mitsuyoshi
AU - Naka, Nobuko
N1 - Funding Information:
We thank Koichiro Tanaka (WPI-iCeMS, Kyoto University) for the use of the confocal microscopy system, and M. Mori and Y. Furukawa (Department of Physics, Kyoto University) for high-resolution absorption measurements. This work was partially supported by Grant-in-Aid for Scientific Research on Innovative Area ?DYCE? (Grant No. 20104002) from MEXT, Japan, and by Grant-in-Aid for Scientific Research (C) (Grant Number 26400317) and Grant-in-Aid for Scientific Research (B) (Grant Number 17H02910) from JSPS, Japan.
PY - 2017/12
Y1 - 2017/12
N2 - 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.
AB - 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.
KW - Excitonic Rydberg states
KW - Line broadening
KW - Photoluminescence
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U2 - 10.1016/j.jlumin.2017.07.060
DO - 10.1016/j.jlumin.2017.07.060
M3 - Article
AN - SCOPUS:85027407223
VL - 192
SP - 808
EP - 813
JO - Journal of Luminescence
JF - Journal of Luminescence
SN - 0022-2313
ER -