科研之友
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摘要
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-d point symmetry lacking a center of inversion as opposed to nonstoichiometric nanocrystals of O-h point symmetry having an inversion center. Our findings are supported by both atomistic sp(3)d(5)s* tight-binding calculations and a symmetry analysis.
- 出版日期2012-7-25
