Nonequilibrium current fluctuation is theoretically studied through a multilevel quantum dot in the Coulomb blockade regime, where the higher-order tunneling processes, "cotunneling," are dominant in the transport. The current fluctuation shows a Poisson (super-Poisson) noise in the elastic (inelastic) cotunneling regime when the bias voltage eV between the leads is smaller (larger) than the excitation energy Δ from the ground level in the quantum dot. The super-Poisson noise is remarkably enhanced by the degeneracy of the excited states around the beginning of inelastic cotunneling at eV ≈ Δ, qualitatively in good agreement with a recent experimental result. An analytical expression is given for the current fluctuation as a function of degeneracy.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2017 Aug 15|
|Event||33rd International Conference on the Physics of Semiconductors, ICPS 2016 - Beijing, China|
Duration: 2016 Jul 31 → 2016 Aug 5
ASJC Scopus subject areas
- Physics and Astronomy(all)