Direct observation of rapid discrete spectral dynamics in single colloidal CdSe-CdS core-shell quantum dots
Autor: | Andrew P. Beyler, Moungi G. Bawendi, Xavier Brokmann, Jian Cui, Lisa F. Marshall |
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Rok vydání: | 2013 |
Předmět: |
Physics
Condensed matter physics Fourier Analysis Spectrum Analysis Dynamics (mechanics) Direct observation Measure (physics) General Physics and Astronomy Sulfides Molecular physics Core shell Diffusion Colloid Models Chemical Quantum dot Quantum Dots Cadmium Compounds Colloids Diffusion (business) Spectroscopy Selenium Compounds |
Zdroj: | Physical review letters. 111(17) |
ISSN: | 1079-7114 |
Popis: | We measure the anomalous spectral diffusion of single colloidal quantum dots over eight temporal decades simultaneously by combining single-molecule spectroscopy and photon-correlation Fourier spectroscopy. Our technique distinguishes between discrete and continuous dynamics and directly reveals that the quasicontinuous spectral diffusion observed using conventional spectroscopy is composed of rapid, discrete spectral jumps. Despite their multiple time scales, these dynamics can be captured by a single mechanism whose parameters vary widely between dots and over time in individual dots. |
Databáze: | OpenAIRE |
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