Nonrenewal statistics in transport through quantum dots

Abstract

The distribution of waiting times between successive tunneling events is an already established method to characterize current fluctuations in mesoscopic systems. Here, I investigate mechanisms generating correlations between subsequent waiting times in two model systems, a pair of capacitively coupled quantum dots and a single-level dot attached to spin-polarized leads. Waiting time correlations are shown to give an insight into the internal dynamics of the system, for example they allow distinction between different mechanisms of the noise enhancement. Moreover, the presence of correlations breaks the validity of the renewal theory. This increases the number of independent cumulants of current fluctuation statistics, thus providing additional sources of information about the transport mechanism. I also propose a method for inferring the presence of waiting time correlations based on low-order current correlation functions. This method gives a way to extend the analysis of nonrenewal current fluctuations to the systems for which single-electron counting is not experimentally feasible. The experimental relevance of the findings is also discussed, for example reanalysis of previous results concerning transport in quantum dots is suggested.

16 pages, 13 figures. Accepted for publication in Phys. Rev. B

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Cited by in corpus (5)

• First-passage times in renewal and nonrenewal systems
• Waiting time distribution revealing the internal spin dynamics in a double quantum dot
• Electron waiting times of a periodically driven single-electron turnstile
• Non-renewal statistics for electron transport in a molecular junction with electron-vibration interaction
• Non-renewal statistics in quantum transport through the eyes of first-passage and waiting time distributions