Nanomechanical characterization of the Kondo charge dynamics in a carbon nanotube

• Main Authors: Götz, K. J. G, Schmid, D. R, Schupp, F. J, Stiller, P. L, Strunk, Ch, Hüttel, A. K
• Format: Journal Article
• Language: English
• Published: 23-04-2018
• Subjects: Physics - Mesoscale and Nanoscale Physics
• DOI: 10.48550/arxiv.1802.00522

Phys. Rev. Lett. 120, 246802 (2018) Using the transversal vibration resonance of a suspended carbon nanotube as
charge detector for its embedded quantum dot, we investigate the case of strong
Kondo correlations between a quantum dot and its leads. We demonstrate that
even when large Kondo conductance is carried at odd electron number, the
charging behaviour remains similar between odd and even quantum dot occupation.
While the Kondo conductance is caused by higher order processes, a sequential
tunneling only model can describe the time-averaged charge. The gate potentials
of maximum current and fastest charge increase display a characteristic
relative shift, which is suppressed at increased temperature. These
observations agree very well with models for Kondo-correlated quantum dots.