Scanning tunneling spectroscopy of InAs nanocrystal quantum dots

Oded Millo, David Katz, Yun Wei Cao, Uri Banin

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


Scanning tunneling spectroscopy is used to investigate single InAs nanocrystals, 20-70 Å in diameter, in a highly asymmetric double barrier tunnel junction configuration. The (Formula presented) characteristics reflect contributions of both single-electron charging and the atomiclike level structure of the quantum dots. The spectra are simulated and well described within the framework of the “orthodox model” for single-electron tunneling. The peaks in the tunneling spectra display a systematic broadening with the reduction of dot diameter, from 40 to 150 meV over the studied quantum dot size range. This is assigned to a decreased electron dwell time on the dot, due to reduction of the barrier height, induced by the blueshift of the quantum-confined levels. The distribution of peak spacings within charging multiplets in the tunneling spectra is found to be Gaussian, resembling observations on metallic quantum dots.

Original languageAmerican English
Pages (from-to)16773-16777
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number24
StatePublished - 2000


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