Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide
Quantum number dependence of the photoluminescence broadening of excitonic Rydberg states in cuprous oxide
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DOI：
10.1016/j.jlumin.2017.07.060
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发表时间：
2017-12-01
影响因子：
3.6
通讯作者：
Naka, Nobuko
中科院分区：
文献类型：
--
作者：
Kitamura, Tatsuya;Takahata, Mitsuyoshi;Naka, Nobuko
我们报道了第一次观察到的光致发光的激子里德堡态的量子数n高达7的Cu2O。我们发现，发光线宽增加，在升高的温度和增加的激光功率下，和效果是更明显的状态与较大的n。温度依赖性归因于散射的光学声子，而密度依赖性解释的激子在基态（n = 1）和激发态（n >= 2）里德伯态的二元碰撞。在波函数和碰撞截面重叠的基础上讨论了n依赖的加宽，碰撞截面由里德伯激子的玻尔半径决定。
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.