Anomalous suppression of valley splittings in lead salt nanocrystals without inversion center

We demonstrate that confinement-induced intervalley splittings of electron energy levels in PbSe and PbS nanocrystals are sensitive to the arrangement of atoms within a nanocrystal. The splittings are strongly suppressed for stoichiometric nanocrystals of T sub(d) point symmetry lacking a center of...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-07, Vol.86 (3), Article 035324
Main Authors: Poddubny, A. N., Nestoklon, M. O., Goupalov, S. V.
Format: Article
Language:English
Subjects:
Condensed matter
Electron energy
Inversions
Mathematical analysis
Nanocrystals
Splitting
Symmetry
Valleys
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Summary:We demonstrate that confinement-induced intervalley splittings of electron energy levels in PbSe and PbS nanocrystals are sensitive to the arrangement of atoms within a nanocrystal. The splittings are strongly suppressed for stoichiometric nanocrystals of T sub(d) point symmetry lacking a center of inversion as opposed to nonstoichiometric nanocrystals of O sub(h) point symmetry having an inversion center. Our findings are supported by both atomistic sp super(3)d super(5)s* tight-binding calculations and a symmetry analysis.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.035324