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Josephson junctions as threshold detectors for full counting statistics
1Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Physical Review Letters
|September 28, 2004
Summary
Threshold detectors and Josephson junctions enable direct measurement of current fluctuation distributions. This method characterizes full counting statistics by analyzing escape rates in mesoscopic conductors.
Area of Science:
- Mesoscopic physics
- Quantum electronics
Background:
- Current fluctuations are fundamental to understanding charge transport in nanoscale devices.
- Direct measurement of full counting statistics (FCS) provides detailed insights into electron transport mechanisms.
Purpose of the Study:
- To propose and validate a novel scheme for directly measuring the full distribution of current fluctuations.
- To utilize Josephson junctions as threshold detectors for characterizing FCS.
Main Methods:
- Employing threshold detectors to measure current fluctuations.
- Exploiting the current dependence of the escape rate.
- Applying the scheme to analyze FCS in tunnel, diffusive, and quasiballistic mesoscopic conductors.
Main Results:
- Demonstrated a method to directly measure the full distribution of current fluctuations.
- Successfully characterized FCS using the proposed scheme.
- Obtained explicit results for various types of mesoscopic conductors.
Conclusions:
- The proposed scheme offers a direct and effective way to measure FCS.
- Josephson junctions are viable tools for this type of measurement.
- The method is applicable to a range of mesoscopic systems.