Acoustic phonon contributions to the emission spectrum of single CdSe nanocrystals

Fernee, Mark J., Littleton, Brad N., Cooper, Steven, Rubinsztein-Dunlop, Halina, Gomez, Daniel E. and Mulvaney, Paul (2008) Acoustic phonon contributions to the emission spectrum of single CdSe nanocrystals. The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces, 112 6: 1878-1884. doi:10.1021/jp709939c


Author Fernee, Mark J.
Littleton, Brad N.
Cooper, Steven
Rubinsztein-Dunlop, Halina
Gomez, Daniel E.
Mulvaney, Paul
Title Acoustic phonon contributions to the emission spectrum of single CdSe nanocrystals
Journal name The Journal of Physical Chemistry Part C: Nanomaterials and Interfaces   Check publisher's open access policy
ISSN 1932-7447
Publication date 2008-02-14
Year available 2008
Sub-type Article (original research)
DOI 10.1021/jp709939c
Open Access Status Not yet assessed
Volume 112
Issue 6
Start page 1878
End page 1884
Total pages 7
Editor G. C. Schatz
Place of publication Washington D.C
Publisher American Chemical Society
Language eng
Subject C1
020503 Nonlinear Optics and Spectroscopy
970102 Expanding Knowledge in the Physical Sciences
Abstract Narrow zero-phonon emission lines are observed in single CdSe/CdZnS core/shell colloidal nanocrystals over a range of cryogenic temperatures up to 40 K. These nanocrystals display dramaticaly improved spectral stability enabling the observation of acoustic phonon sidebands accompanying most zero-phonon lines. A discrete phonon mode is attributed to the electron coupling to the l = 0 acoustic breathing mode via the deformation coupling. The Huang−Rhys parameter, Sac, for this interaction is found to vary from 0.0016 to 0.09, demonstrating a wide dispersion in exciton−phonon coupling between different nanocrystals. Indeed, we observe single nanocrystals in which all acoustic phonon sidebands vanish, in close agreement with theoretical predictions that there should be negligible acoustic phonon coupling in an ideal spherical CdSe nanocrystal. Such nanocrystals are virtually decoupled from their environment, which is potentially useful for quantum technologies, such as single photon sources and quantum computing. In general, the ability to detect and quantify phonon interactions within single nanocrystals will provide significant insight into energy relaxation and dephasing processes in these systems.
Keyword Quantum dots
Nanocrystals
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
Centre for Quantum Computer Technology Publications
 
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