Pico-Cortes, Jordi and Platero, Gloria and Donarini, Andrea and Grifoni, Milena (2024) Nonequilibrium cotunneling in quantum dot Josephson junctions. PHYSICAL REVIEW B, 110 (12): 125418. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
We investigate nonequilibrium transport through superconducting nanojunctions using a Liouville space approach. The formalism allows us to study finite-gap effects, and to account for both quasiparticle and Cooper-pair tunneling. With focus on the weak-tunneling limit, we study the stationary dc and ac current up to second order (cotunneling) in the hybridization energy. For the particular case of a strongly interacting quantum dot sandwiched between two superconductors, we identify the characteristic virtual processes that yield the Andreev and Josephson current and obtain the dependence on the gate and bias voltage for the dc current, the critical current, and the phase-dependent dissipative current. In particular, the critical current is characterized by regions in the stability diagram in which its sign changes from positive to negative, resulting in a multitude of 0 - pi transitions. The latter signal the interplay between strong interactions and tunneling at finite bias.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANDREEV BOUND-STATES; ZERO-BIAS ANOMALIES; TRANSPORT; SUPERCURRENT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Aug 2025 06:13 |
| Last Modified: | 26 Aug 2025 06:13 |
| URI: | https://pred.uni-regensburg.de/id/eprint/63991 |
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