biostudies-literature00480Caram JRDefense Threat Reduction AgencyNIBIB NIH HHSBasic Energy Sciences, Office of Science, U.S. Department of EnergyW.M. Keck FoundationAir Force Office of Scientific ResearchNational Science Foundation196-204https://www.ebi.ac.uk/biostudies/studies/S-EPMC3976995biostudies-literatureUnknown5(1)The creation and manipulation of quantum superpositions is a fundamental goal for the development of materials with novel optoelectronic properties. In this letter, we report persistent (~80 fs lifetime) quantum coherence between the 1S and 1P excitonic states in zinc-blende colloidal CdSe quantum dots at room temperature, measured using Two-Dimensional Electronic Spectroscopy. We demonstrate that this quantum coherence manifests as an intradot phenomenon, the frequency of which depends on the size of the dot excited within the ensemble of QDs. We model the lifetime of the coherence and demonstrate that correlated interexcitonic fluctuations preserve relative phase between excitonic states. These observations suggest an avenue for engineering long-lived interexcitonic quantum coherence in colloidal quantum dots.The journal of physical chemistry lettersPersistent Inter-Excitonic Quantum Coherence in CdSe Quantum Dots.PMC3976995HDTRA1-10-1-0091NAGRFPT32 EB009412DMR 08-02054FA9550-09-1-0117SCGFDE-EE005312Rolczynski BSFidler AFDolzhnikov DSZheng HCaram JRTalapin DVEngel GSDahlberg PDGriffin GB48falsePersistent Inter-Excitonic Quantum Coherence in CdSe Quantum Dots.The creation and manipulation of quantum superpositions is a fundamental goal for the development of materials with novel optoelectronic properties. In this letter, we report persistent (~80 fs lifetime) quantum coherence between the 1S and 1P excitonic states in zinc-blende colloidal CdSe quantum dots at room temperature, measured using Two-Dimensional Electronic Spectroscopy. We demonstrate that this quantum coherence manifests as an intradot phenomenon, the frequency of which depends on the size of the dot excited within the ensemble of QDs. We model the lifetime of the coherence and demonstrate that correlated interexcitonic fluctuations preserve relative phase between excitonic states. These observations suggest an avenue for engineering long-lived interexcitonic quantum coherence in colloidal quantum dots.2014-01-01T00:00:00Z2014 Jan2024-11-21T09:53:24.114Z2019-03-27T01:24:28ZS-EPMC39769952471967910.1021/jz402336t