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 language||American English|
|Number of pages||7|
|Journal||Physica A: Statistical Mechanics and its Applications|
|State||Published - 15 Dec 2001|
|Event||International Workshop on Frontiers in the Physics of Complex Systems - Ramat-Gan, Israel|
Duration: 25 Mar 2001 → 28 Mar 2001
Bibliographical noteFunding 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