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

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

2001-04-15

arxiv.org/abs/cond-mat/0104272v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.86.5751

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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