Size-dependent Tunneling and Optical Spectroscopy of InAs Nanocrystal Quantum Dots

O. Millo*, D. Katz, Y. Levi, Y. W. Cao, U. Banin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Scanning tunneling spectroscopy is used to investigate single InAs nanocrystals, 2 to 8 nm in diameter. The tunneling current-voltage characteristics exhibit a pronounced size dependence of both single electron charging energy and quantum-confined electronic states. These are well described using the "Orthodox Model" for single electron tunneling through a quantum dot with a discrete level structure. Quantum confined states having atomic-like S and P symmetries are directly identified in the tunneling spectra as two and six-fold single electron charging multiplets, respectively. The tunneling spectra acquired on un-passivated nanocrystals show clear evidence of sub-gap surface states. Surpisingly, excellent agreement is found between the strongly allowed optical transitions and spacing of levels detected in the tunneling experiment.

Original languageAmerican English
Pages (from-to)365-373
Number of pages9
JournalJournal of Low Temperature Physics
Issue number5-6
StatePublished - 2000


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