Non-Markovian Exciton-Phonon Interactions in Core-Shell Colloidal Quantum Dots at Femtosecond Timescales
Journal Article
·
· Physical Review Letters
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sungkyunkwan Univ., Gyeonggi (Korea)
- Univ. Estadual de Campinas, Sao Paulo (Brazil)
We perform two-dimensional coherent spectroscopy on CdSe/CdZnS core-shell colloidal quantum dots at cryogenic temperatures. In the two-dimensional spectra, sidebands due to electronic coupling with CdSe lattice LO-phonon modes are observed to have evolutions deviating from the exponential dephasing expected from Markovian spectral diffusion, which is instantaneous and memoryless. Comparison to simulations provides evidence that LO-phonon coupling induces energy-gap fluctuations on the finite timescales of nuclear motion. Furthermore, the femtosecond resolution of our technique probes exciton dynamics directly on the timescales of phonon coupling in nanocrystals.
- Research Organization:
- Univ. of Michigan, Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0015782
- OSTI ID:
- 1612329
- Alternate ID(s):
- OSTI ID: 1546822
- Journal Information:
- Physical Review Letters, Vol. 123, Issue 5; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 21 works
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