Shell-Tunneling Spectroscopy of the Single-Particle Energy Levels of Insulating Quantum Dots
- E. P. A. M. Bakkers
- ,
- Z. Hens
- ,
- A. Zunger
- ,
- A. Franceschetti
- ,
- L. P. Kouwenhoven
- ,
- L. Gurevich
- , and
- D. Vanmaekelbergh
Abstract

The energy levels of CdSe quantum dots are studied by scanning tunneling spectroscopy. By varying the tip−dot distance, we switch from “shell-filling” spectroscopy (where electrons accumulate in the dot and experience mutual repulsion) to “shell-tunneling” spectroscopy (where electrons tunnel, one at a time, through the dot). Shell-tunneling spectroscopy provides the single-particle energy levels of the CdSe quantum dot. The results of both types of tunneling spectroscopy are compared with pseudopotential many-body calculations.
†
University of Utrecht.
‡
National Renewable Energy Laboratory.
§
Delft University of Technology.
*
Corresponding author. E-mail: [email protected].
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