title: Variation of energy density of states in quantum dot arrays due to interparticle electronic coupling.
abstract: Subnanometer-resolved local electron energy structure was measured in PbS quantum dot superlattice arrays using valence electron energy loss spectroscopy with scanning transmission electron microscopy. We found smaller values of the lowest available transition energies and an increased density of electronic states in the space between quantum dots with shorter interparticle spacing, indicating extension of carrier wave functions as a result of interparticle electronic coupling. A quantum simulation verified both trends and illustrated the wave function extension effect.
authors: Department of Mechanical Engineering and ‡Department of Material Science and Engineering, Stanford University , Stanford, California 94305, United States.
authors: Manca
authors: M
authors: Logar
authors: Shicheng
authors: S
authors: Xu
authors: Shinjita
authors: S
authors: Acharya
authors: Fritz B
authors: FB
authors: Prinz
keywords: Energy density of states; STEM-EELS; electronic coupling; quantum dot; superlattice