Nonequilibrium cotunneling in quantum dot Josephson junctions
Jordi Picó-Cortés, Gloria Platero, Andrea Donarini, Milena Grifoni
DOI 10.1103/PhysRevB.110.125418 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
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−π transitions. The latter signal the interplay between strong interactions and tunneling at finite bias.
Similar papers
Josephson Current in Strongly Correlated Double Quantum Dots
similarity 0.92Rok Žitko et al.
Source status unknown — claims are unverified
Supercurrent and multiple singlet-doublet phase transitions of a quantum dot Josephson junction inside an Aharonov-Bohm ring
similarity 0.91C. Karrasch & V. Meden
Source status unknown — claims are unverified
Josephson Current in Carbon Nanotubes with Spin-Orbit Interaction
similarity 0.91Jong Soo Lim et al.
Source status unknown — claims are unverified
Dynamical properties of a vibrating molecular quantum dot in a Josephson junction
similarity 0.91J. Fransson et al.
Source status unknown — claims are unverified
Non-Equilibrium Josephson and Andreev Current through Interacting Quantum Dots
similarity 0.90Marco G. Pala et al. · 2007 · arXiv:0704.0204
Source status unknown — claims are unverified
Signatures of nonlocal Cooper-pair transport and of a singlet-triplet transition in the critical current of a double-quantum-dot Josephson junction
similarity 0.90B. Probst et al. · 2016 · arXiv:1606.07297
Source status unknown — claims are unverified