Variation of Energy Density of States in Quantum Dot Arrays due to Interparticle Electronic Coupling | Zendy

Manca Logar | Zendy; Shicheng Xu | Zendy; Shinjita Acharya | Zendy; Fritz B. Prinz | Zendy

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Variation of Energy Density of States in Quantum Dot Arrays due to Interparticle Electronic Coupling

Author(s) -

Manca Logar,

Shicheng Xu,

Shinjita Acharya,

Fritz B. Prinz

Publication year - 2015

Publication title -

nano letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 4.853

H-Index - 488

eISSN - 1530-6992

pISSN - 1530-6984

DOI - 10.1021/nl5046507

Subject(s) - quantum dot , superlattice , electronic structure , condensed matter physics , wave function , spectroscopy , electron , density of states , valence (chemistry) , molecular physics , materials science , chemistry , atomic physics , physics , nanotechnology , quantum mechanics

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.

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