Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide

Tatsuya Kitamura; Mitsuyoshi Takahata; Nobuko Naka

doi:10.1016/j.jlumin.2017.07.060

Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide

Tatsuya Kitamura, Mitsuyoshi Takahata, Nobuko Naka

Research output: Contribution to journal › Article

9 Citations (Scopus)

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
Pages (from-to)	808-813
Number of pages	6
Journal	Journal of Luminescence
Volume	192
DOIs	https://doi.org/10.1016/j.jlumin.2017.07.060
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

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Kitamura, T., Takahata, M., & Naka, N. (2017). Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide. Journal of Luminescence, 192, 808-813. https://doi.org/10.1016/j.jlumin.2017.07.060

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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.",

keywords = "Excitonic Rydberg states, Line broadening, Photoluminescence",

author = "Tatsuya Kitamura and Mitsuyoshi Takahata and Nobuko Naka",

year = "2017",

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doi = "10.1016/j.jlumin.2017.07.060",

language = "English",

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T1 - Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide

AU - Kitamura, Tatsuya

AU - Takahata, Mitsuyoshi

AU - Naka, Nobuko

PY - 2017/12/1

Y1 - 2017/12/1

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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