Article (Scientific journals)
Anomalous quantum confinement of the longitudinal optical phonon mode in PbSe quantum dots
Habinshuti, J.; Kilian, O.; Cristini-Robbe, O. et al.
2013In Physical Review. B, Condensed Matter and Materials Physics, 88 (11), p. 115313
Peer Reviewed verified by ORBi
 

Files


Full Text
PRB88e115313_PbSeNC_Raman.pdf
Publisher postprint (1.17 MB)
Download

All documents in ORBilu are protected by a user license.

Send to



Details



Abstract :
[en] We have investigated the diameter dependence of the Raman spectra of lead selenide nanocrystals. The first-order Raman peak at about 136 cm−1 and its second-order overtone at twice this wavenumber move up in energy with decreasing nanocrystal diameter. This anomalous behavior is interpreted in terms of quantum confinement of the longitudinal optical (LO) phonon whose frequency displays a minimum at in the dispersion of bulk PbSe. We perform ab initio calculations of the phonons of PbSe slabs with up to 15 layers. The LO mode perpendicular to the slab shifts indeed upwards with decreasing layer thickness, thus validating the interpretation of the anomalous radius dependence of the Raman spectra in terms of quantum confinement.
Disciplines :
Physics
Author, co-author :
Habinshuti, J.;  Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), CNRS ; Laboratoire de Spectrochimie Infrarouge et Raman, LASIR, Université des Sciences et Technologies de Lille , UMR 8520, Département ISEN
Kilian, O.;  Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), CNRS, UMR 8520, Departement ISEN ; Department of Experimental Physics, Comenius University
Cristini-Robbe, O.;  Laboratoire de Physique des Lasers, Atomes et Molécules (CNRS, UMR 8523), Bat P-5, Université des Sciences et Technologies de Lille
Sashchiuk, A.;  Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Technion, Haifa
Addad, A.;  Laboratoire de Structure et Propriétés de l’Etat Solide, Université des Sciences et Technologies de Lille
Turrell, S.;  Laboratoire de Spectrochimie Infrarouge et Raman, LASIR, Université des Sciences et Technologies de Lille
Lifshitz, E.;  Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Technion, Haifa
Grandidier, B.;  Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), CNRS, UMR 8520, Département ISEN
Wirtz, Ludger ;  Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), CNRS, UMR 8520, Département ISEN ; University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
Language :
English
Title :
Anomalous quantum confinement of the longitudinal optical phonon mode in PbSe quantum dots
Publication date :
24 September 2013
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York
Volume :
88
Issue :
11
Pages :
115313
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 12 October 2013

Statistics


Number of views
86 (1 by Unilu)
Number of downloads
264 (1 by Unilu)

Scopus citations®
 
24
Scopus citations®
without self-citations
22
WoS citations
 
23

Bibliography


Similar publications



Contact ORBilu