TY - JOUR

T1 - Role of Valley Anisotropy in Optical Absorption of Monodisperse PbS Nanocrystals

AU - Литвяк, Валентина Михайловна

AU - Чербунин, Роман Викторович

AU - Nestoklon, Mikhail

AU - Poddubny, Alexander

AU - Golubkov, Valerii

AU - Onushchenko, Petr

AU - Babkina, Anastasiya

AU - Onushchenko, Alexei

AU - Goupalov, Serguei

PY - 2017

Y1 - 2017

N2 - We study light absorption by nearly monodisperse PbS nanocrystalsgrown in a glass matrix. The absorption spectra demonstrate a well-resolvedstructure 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.

AB - We study light absorption by nearly monodisperse PbS nanocrystalsgrown in a glass matrix. The absorption spectra demonstrate a well-resolvedstructure 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.

M3 - Article

SP - 27766

EP - 27773

JO - ACS Nano

JF - ACS Nano

SN - 1936-0851

ER -