DC transport in a dissipative superconducting quantum point contact
Anne-Maria Visuri, Jeffrey Mohan, Shun Uchino, Meng-Zi Huang, Tilman Esslinger, Thierry Giamarchi
DOI 10.1103/PhysRevResearch.5.033095 · Physical Review Research
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Abstract
We study the current-voltage characteristics of a superconducting junction with particle losses at the contacts. We adopt the Keldysh formalism to compute the steady-state current for varying transmission of the contact. In the low-transmission regime, the dissipation leads to an enhancement of the current at low bias, a nonmonotonic dependence of current on dissipation, and the emergence of new structures in the current-voltage curves. The effect of dissipation by particle loss is found to be qualitatively different from that of a finite temperature and a finite inelastic scattering rate in the reservoirs.
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