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Shell-Tunneling Spectroscopy of the Single-Particle Energy Levels of Insulating Quantum Dots

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Debye Institute, University of Utrecht, P.O. Box 80000, 3508 TA Utrecht, The Netherlands, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Applied Physics and ERATO Mesoscopic Correlation Project, Delft University of Technology, P.O. Box 5046, 5600 GA Delft, The Netherlands
Cite this: Nano Letters 2001, 1, 10, 551–556
Publication Date (Web):August 30, 2001
https://doi.org/10.1021/nl015572b
Copyright © 2001 American Chemical Society

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    Abstract

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    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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