Abstract
We performed scanning tunnelling spectroscopy oninsulating colloidal CdSe quantum dots attached to gold with arigid self-assembled monolayer. By varying the tip-dot distancewe change the relative rate of tunnelling into versus tunnellingout of the dot over a wide range. If the tip is retracted relatively farfrom the dot, tunnelling in is much slower than tunnellingout of the dot; electrons tunnel one at a time through thedot. The resonances in the conductance spectrum correspond tothe single-particle energy levels of the CdSe quantum dot. Whenthe tip is brought closer to the dot, tunnelling in can becomeas fast as tunnelling out of the dot. Up to three electrons can be present in the particle; the electron-electron Coulombinteractions lead to a more complex conductance spectrum.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
