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Measuring cotunneling in its wake

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Article number205413
<mark>Journal publication date</mark>11/11/2014
<mark>Journal</mark>Physical review B
Issue number20
Number of pages13
Publication StatusPublished
<mark>Original language</mark>English


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.

Bibliographic note

15 pages, 9 figures, 1 appendix, published version