Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-02-05
Phys. Rev. B 77, 195329 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 7 figures
Scientific paper
10.1103/PhysRevB.77.195329
Cotunneling current through a resonant level coupled to either normal and superconducting or to two superconducting leads is studied for the domain of bias voltages, V, exceeding the superconducting gap, 2\Delta. Due to the on-site repulsion in the resonant level, cotunneling of an electron is accompanied by creation of a quasiparticle in a superconducting lead. Energy conservation imposes a threshold for this inelastic transport channel: V_c=3\Delta for N-S case and \tilde{V}_c=4\Delta for the S-S case. We demonstrate that the behavior of current near the respective thresholds is nonanalytic, namely, \delta I^{in}(V)\propto (V-V_c)^{3/2}\Theta(V-V_c) and \delta I^{in}(V) \propto (V-\tilde{V}_c)\Theta(V-\tilde{V}_c). Stronger anomaly for the S-S leads is the consequence of the enhanced density of states at the edges of the gap. In addition, the enhanced density of states makes the threshold anomalies for two-electron cotunneling processes in the Coulomb-blockaded regions more pronounced than for the N-N leads.
Mkhitaryan V. V.
Raikh Mikhail E.
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