Role of Valley Anisotropy in Optical Absorption of Monodisperse PbS Nanocrystals

Alexander N. Poddubny, Valentina M. Litvyak, Mikhail O. Nestoklon, Roman V. Cherbunin, Valerii V. Golubkov, Petr A. Onushchenko, Anastasiya N. Babkina, Alexei A. Onushchenko, Serguei V. Goupalov

Research output: Contribution to journalArticlepeer-review


We study light absorption by nearly monodisperse PbS nanocrystals grown in a glass matrix. The absorption spectra demonstrate a well-resolved structure at energies above the first absorption peak. The absorption cross sections are calculated with an empirical tight-binding model accounting for the quantum confinement, the band anisotropy, and valley splittings. Absorption spectra measured at 4 K quantitatively agree with the atomistic calculations. This allows us to unambiguously ascribe the much-debated second absorption peak to the p-p optical transition and directly measure the splitting of excited p states.

Original languageEnglish
Pages (from-to)27766-27773
Number of pages8
JournalJournal of Physical chemistry c
Issue number49
StatePublished - 14 Dec 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films


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