Journal
PHYSICAL REVIEW B
Volume 88, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.115313
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Funding
- EU Seventh Framework Program [PITNGA-2008-214954]
- EU-FP7 SANS (Self-Assembled Nanostructure System) project, Israel Science Foundation [1009/07, 1425/04]
- USA-Israel Binational Science Foundation [2006-225]
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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 Gamma 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.
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