Abstract
Current imaging scanning tunneling microscopy is used to observe the electronic wave functions in core/shell nanocrystals. Images taken at a bias corresponding to the conduction band state show that it is localized in the central core region, while images at higher bias probing the state reveal that it extends to the shell. This is supported by optical and tunneling spectroscopy data demonstrating that the gap closes upon shell growth. Shapes of the current images resemble atomlike envelope wave functions of the quantum dot calculated within a particle in a box model.
- Received 8 November 2000
DOI:https://doi.org/10.1103/PhysRevLett.86.5751
©2001 American Physical Society