We introduce a rate formalism to treat classically forbidden electron transport through a quantum dot (cotunneling) in the presence of a coupled measurement device. We demonstrate this formalism for a toy model case of cotunneling through a single-level dot while being coupled to a strongly pinched-off quantum point contact (QPC). We find that the detector generates three types of back-action: the measurement collapses the coherent transport through the virtual state, but at the same time allows for QPC-assisted incoherent transport, and widens the dot level. Last, we obtain the measured cotunneling time from the cross correlation between dot and QPC currents.
@article{arxiv.1403.5897,
title = {Measuring cotunneling in its wake},
author = {Oded Zilberberg and Assaf Carmi and Alessandro Romito},
journal= {arXiv preprint arXiv:1403.5897},
year = {2014}
}
Comments
15 pages, 9 figures, 1 appendix, published version