Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-03-11
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Figures 2(b)(c) left out due to file size constraints (which, however, can be requested from authors). Submitted to Phys. Rev.
Scientific paper
We study current fluctuations in a phase coherent Y-shaped conductor connected to external leads and voltage probes. The voltage probes are taken to have finite impedances and thus can cause voltage fluctuations in the circuit. Applying the Keldysh formulation and a saddle point approximation appropriate for slow fluctuations, we examine at zero temperature the feedback effects on the current fluctuations due to the fluctuating voltages. We consider mesoscopic Y-shaped conductors made of tunnel junctions and of diffusive wires. Unlike two-terminal conductors, we find that for the Y-shaped conductors the current moments in the presence of external impedances cannot be obtained from simple rescaling of the bare moments already in the second moments. As a direct consequence, we find that the cross correlation between the output terminals can become positive due to the impedances in the circuit. We provide formulas for the range of parameters that can cause positive cross correlations.
Wu Shin-Tza
Yip Sung Kit
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