Abstract
We have explored the low-temperature linear and nonlinear electrical conductance of metallic carbon nanotubes (CNT’s), which were grown by the chemical-vapor deposition method. The high transparency of the contacts allows to study these two-terminal devices in the high conductance regime. We observe the expected four-fold shell pattern together with Kondo physics at intermediate transparency and a transition to the open regime in which the maximum conductance is doubled and bound by . In the high- regime, at the transition from a quantum dot to a weak link, the CNT levels are strongly broadened. Nonetheless, sharp resonances appear superimposed on the background which varies slowly with gate voltage. The resonances are identified by their lineshape as Fano resonances. The origin of Fano resonances is discussed along the modeling.
- Received 23 June 2004
- Publisher error corrected 9 May 2005
DOI:https://doi.org/10.1103/PhysRevB.70.195408
©2004 American Physical Society
Corrections
9 May 2005