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Imaging and spectroscopy of artificial-atom states in core/shell nanocrystal quantum dots

Authors
  • Millo, Oded
  • Katz, David
  • Cao, YunWei
  • Banin, Uri
Type
Preprint
Publication Date
Apr 15, 2001
Submission Date
Apr 15, 2001
Identifiers
DOI: 10.1103/PhysRevLett.86.5751
arXiv ID: cond-mat/0104272
Source
arXiv
License
Unknown
External links

Abstract

Current imaging scanning tunneling microscopy is used to observe the electronic wavefunctions in InAs/ZnSe core/shell nanocrystals. Images taken at a bias corresponding to the s conduction band state show that it is localized in the central core region, while images at higher bias probing the p state reveal that it extends to the shell. This is supported by optical and tunneling spectroscopy data demonstrating that the s-p gap closes upon shell growth. Shapes of the current images resemble atom-like envelope wavefunctions of the quantum dot calculated within a particle in a box model.

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