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The ultimate limit to the emission linewidth of single nanocrystals

机译:单个纳米晶体的发射线宽的极限

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摘要

Measurements of the emission linewidth of single nanocrystals are usually limited by spectral diffusion. At cryogenic temperatures, the origin of this instability was revealed to be photo-induced, suggesting that the spectral peak position may be stable in the limit of vanishing optical excitation. Here we test this stability using resonant photoluminescence excitation and find there is persistent spectral broadening, which ultimately limits the emission linewidth in these materials. The spectral broadening is shown to be consistent with spontaneous fluctuations of the local electrostatic field within the disordered environment surrounding the nanocrystal.
机译:单个纳米晶体的发射线宽的测量通常受光谱扩散的限制。在低温下,这种不稳定性的根源被发现是光诱导的,这表明光谱峰的位置在光学激发消失的范围内可能是稳定的。在这里,我们使用共振光致发光激发来测试这种稳定性,发现存在持久的光谱展宽,这最终限制了这些材料的发射线宽。光谱展宽显示与围绕纳米晶体的无序环境内的局部静电场的自发波动一致。

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