期刊
NANO LETTERS
卷 19, 期 7, 页码 4442-4447出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01237
关键词
Perovskite; nanocrystal; coherence; quantum interference
类别
资金
- National Key R&D Program of China [2017YEA0303700]
- National Natural Science Foundation of China [11574147, 11621091]
- PAPD of Jiangsu Higher Education Institutions
Coherent manipulation of the exciton wave function in a single semiconductor colloidal nanocrystal (NC) has been actively pursued in the past decades without any success, mainly due to the bothersome existence of the spectral diffusion and the photoluminescence (PL) blinking effects. Such optical deficiencies can be naturally avoided in the newly developed colloidal NCs of perovskite CsPbI3, leading to the PL spectrum with a stable intensity at the single-particle level. Meanwhile, from the first-order photon-correlation measurement, a PL line width smaller than 20 mu eV is estimated for the emission state of the neutral exciton in a single CsPbI3 NC. Moreover, a dephasing time of about 10 ps can be extracted from the quantum interference measurement on the absorption state of the charged exciton. This stable demonstration of a coherent optical feature will advance single colloidal NCs into the quantum information regime, opening up an alternative yet prospective research direction beyond their traditional applications such as in optoelectronic devices and bioimaging.
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