The Peculiar Electronic Structure of PbSe Quantum Dots

We find the following in PbSe dots: The intraband as well as interband excitations involve the massively split L-manifold states. In contrast to previous suggestions that the spacings between valence band levels will equal those between conduction band levels, we find a densely spaced hole manifold and much sparser electron manifold

J. M. An; A. Franceschetti; S. V. Dudiy; Alex Zunger

2006

Scholarcy highlights

  • PbSe is a pseudo-II-VI material distinguished from ordinary II-VI's by having both its valence band maximum and its conduction band minimum located at the fourfold-degenerate L-point in the Brillouin zone
  • The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online
  • We find the following in PbSe dots: The intraband as well as interband excitations involve the massively split L-manifold states. In contrast to previous suggestions that the spacings between valence band levels will equal those between conduction band levels, we find a densely spaced hole manifold and much sparser electron manifold
  • This finding reflects the existence of a few valence band maxima in bulk PbSe within ∼500 meV
  • This result reverses previous expectations of slow hole cooling in PbSe dots. The calculated optical absorption spectrum reproduces the measured absorption peak that had previously been attributed to the forbidden 1Sh → 1Pe or 1Ph → 1Se transitions on the basis of k·p calculations
  • We find that this transition corresponds to an allowed 1Ph → 1Pe excitation arising mainly from bulk states near the L valleys on the Γ−L lines of the Brillouin zone
  • The Journal of Physical Chemistry C2009,113 , 19859-19862

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