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Voltage and dephasing probes in mesoscopic conductors : a study of full-counting statistics

Publication date2007
Abstract

Voltage and dephasing probes introduce incoherent inelastic and incoherent quasielastic scattering into a coherent mesoscopic conductor. We discuss in detail the concepts of voltage and dephasing probes and develop a full-counting statistics approach to investigate their effect on the transport statistics. The formalism is applied to several experimentally relevant examples. A comparison of different probe models and with procedures like phase averaging over an appropriate phase distribution shows that there is a perfect equivalence between the models for the case of one single-channel probe. Interestingly, the appropriate phase-distribution function is found to be uniform. A uniform distribution is provided by a chaotic cavity with a long dwell time. The dwell time of a chaotic cavity plays a role similar to the charge response time of a voltage or dephasing probe. For multichannel or multiple probes the transport statistics of voltage and dephasing probes differs and the equivalence with phase averaging is similarly lost.

Keywords
  • Mesoscopic systems
  • Statistical analysis
  • Chaos
Citation (ISO format)
FORSTER, Heidi et al. Voltage and dephasing probes in mesoscopic conductors : a study of full-counting statistics. In: Physical review. B, Condensed matter and materials physics, 2007, vol. 75, p. 035340. doi: 10.1103/PhysRevB.75.035340
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ISSN of the journal1098-0121
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