Observation of an Excitonic Quantum Coherence in CdSe Nanocrystals

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• 作者：Shuo Dong ; Dhara Trivedi ; Sabyasachi Chakrabortty ; Takayoshi Kobayashi ; Yinthai Chan ; Oleg V. Prezhdo ; Zhi-Heng Loh
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：15
• 期：10
• 页码：6875-6882
• 全文大小：489K
• ISSN：1530-6992

文摘

Recent observations of excitonic coherences within photosynthetic complexes suggest that quantum coherences could enhance biological light harvesting efficiencies. Here, we employ optical pump鈥損robe spectroscopy with few-femtosecond pulses to observe an excitonic quantum coherence in CdSe nanocrystals, a prototypical artificial light harvesting system. This coherence, which encodes the high-speed migration of charge over nanometer length scales, is also found to markedly alter the displacement amplitudes of phonons, signaling dynamics in the non-Born鈥揙ppenheimer regime.