Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2012-02-23
New J. Phys. 14 (2012) 023052
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
12 pages, 6 figures
Scientific paper
10.1088/1367-2630/14/2/023052
We investigate transport in a three-terminal graphene quantum dot. All nine elements of the conductance matrix have been independently measured. In the Coulomb blockade regime accurate measurements of individual conductance resonances reveal slightly different resonance energies depending on which pair of leads is used for probing. Rapid changes in the tunneling coupling between the leads and the dot due to localized states in the constrictions has been excluded by tuning the difference in resonance energies using in-plane gates which couple preferentially to individual constrictions. The interpretation of the different resonance energies is then based on the presence of a number of levels in the dot with an energy spacing of the order of the measurement temperature. In this multi-level transport regime the three-terminal device offers the opportunity to sense if the individual levels couple with different strengths to the different leads. This in turn gives qualitative insight into the spatial profile of the corresponding quantum dot wave functions.
Ensslin Klaus
Ihn Thomas
Jacobsen Arnhild
Simonet Pascal
No associations
LandOfFree
Transport in a three-terminal graphene quantum dot in the multi-level regime does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Transport in a three-terminal graphene quantum dot in the multi-level regime, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transport in a three-terminal graphene quantum dot in the multi-level regime will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-660136