Physics – Condensed Matter – Superconductivity
Scientific paper
2001-08-09
Physica C 367 (1-4), 86 (2002)
Physics
Condensed Matter
Superconductivity
6 pages, 4 figures; presented at the SDP2001 conference in Tokyo
Scientific paper
10.1016/S0921-4534(01)01004-8
We discuss how life-time broadening of quasiparticle states influences single- and two-particle current transport through zero-energy states at normal metal/d-wave superconductor junctions. We distinguish between intrinsic broadening (imaginary part $\eta$ of the energy), which couples the bound states with the superconducting reservoir, and broadening due to leakage through the junction barrier, which couples the bound states with the normal metal reservoir. We show that shot noise is highly sensitive to the mechanism of broadening, while the conductance is not. In the limit of small but finite intrinsic broadening, compared to the junction transparency $D$, $\eta/\Delta_0\ll D$, the low-voltage shot noise at zero frequency and zero temperature becomes proportional to the magnitude $\eta$ of intrinsic broadening ($\Delta_0$ is the maximum d-wave gap).
Lofwander Tomas
Shumeiko Vitaly S.
Wendin Goran
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