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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Non-Markovian Exciton-Phonon Interactions in Core-Shell Colloidal Quantum Dots at Femtosecond Timescales

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Author(s):
Liu, A. [1] ; Almeida, D. B. [1] ; Bae, W. K. [2] ; Padilha, L. A. [3] ; Cundiff, S. T. [1]
Total Authors: 5
Affiliation:
[1] Univ Michigan, Phys Dept, Ann Arbor, MI 48109 - USA
[2] Sungkyunkwan Univ, SKKU Adv Inst Nano Technol, Gyeonggi 16419 - South Korea
[3] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Physical Review Letters; v. 123, n. 5 AUG 2 2019.
Web of Science Citations: 3
Abstract

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. The femtosecond resolution of our technique probes exciton dynamics directly on the timescales of phonon coupling in nanocrystals. (AU)

FAPESP's process: 13/16911-2 - Advanced spectroscopy of novel nanomaterials
Grantee:Lázaro Aurélio Padilha Junior
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 16/50011-7 - Two-dimensional spectroscopy of novel nanomaterials
Grantee:Lázaro Aurélio Padilha Junior
Support Opportunities: Regular Research Grants