Junction symmetry effects in resonant tunneling through InAs nanocrystal quantum dots

David Katz, Shi Hai Kan, Uri Banin, Oded Millo*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


Tunneling spectra of InAs nanocrystals anchored to gold via linker molecules or deposited onto graphite were measured using scanning tunneling microscopy, in a double-barrier tunnel-junction configuration. The effects of the junction symmetry on the tunneling spectra, due to both the voltage division and the tunneling rates, are studied experimentally and modeled theoretically. We observe resonant tunneling through nanocrystal states without charging when the tip is retracted from nanocrystals deposited on graphite. Charging is regained upon reducing the tip-nanocrystal distance, making the junctions more symmetric. In contrast, charging-free resonant tunneling was not achieved for the nanocrystal/linker-molecule/Au system.

Original languageAmerican English
Pages (from-to)328-334
Number of pages7
JournalPhysica A: Statistical Mechanics and its Applications
Issue number1-4
StatePublished - 15 Dec 2001
EventInternational Workshop on Frontiers in the Physics of Complex Systems - Ramat-Gan, Israel
Duration: 25 Mar 200128 Mar 2001

Bibliographical note

Funding Information:
We thank Y.-M. Niquet for his helpful discussions. This work was supported by the Israel Science Foundation founded by the Israel Academy of Science, the BIKURA foundation, and by Intel-Israel.


  • Quantum dots
  • Scanning tunneling microscopy (or STM)
  • Semiconductor nanocrystals
  • Single electron tunneling
  • Tunneling spectroscopy


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