2001/08/09 by Tomas Löfwander, T. Lofwander, V. S. Shumeĭko +3 · 1 citation
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #cond-mat.supr-con
paper · pdf · doi:10.1016/s0921-4534(01)01004-8
published as Physica C 367 (1-4), 86 (2002) · 6 pages, 4 figures; presented at the SDP2001 conference in Tokyo
arxiv created 2001/08/09 · openalex publication_date 2002/02/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 η 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, η/Δ0≪ D, the low-voltage shot noise at zero frequency and zero temperature becomes proportional to the magnitude η of intrinsic broadening (Δ0 is the maximum d-wave gap).