Superconducting tunneling spectroscopy of a carbon nanotube quantum dot

Dirks, Travis; Yung-Fu Chen; Birge, Norman O.; Mason, Nadya
November 2009
Applied Physics Letters;11/9/2009, Vol. 95 Issue 19, p192103
Academic Journal
We report results on superconducting tunneling spectroscopy of a carbon nanotube quantum dot. Using a three-probe technique that includes a superconducting tunnel probe, we map out changes in conductance due to band structure, excited states, and end-to-end bias. The superconducting probe allows us to observe enhanced spectroscopic features, such as robust signals of both elastic and inelastic cotunneling. We also see evidence of inelastic scattering processes inside the quantum dot.


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