scholarly journals Josephson current through a ferromagnetic bilayer: Beyond the quasiclassical approximation

2019 ◽  
Vol 100 (22) ◽  
Author(s):  
Hao Meng ◽  
Yajie Ren ◽  
Javier E. Villegas ◽  
A. I. Buzdin
Keyword(s):  
Josephson Current ◽  
Quasiclassical Approximation

Josephson current in a clean superconductor normal-metal superconductor junction

1996 ◽  
Vol 46 (S2) ◽  
pp. 565-566
Author(s):  
H. X. Tang ◽  
Z. D. Wang ◽  
Yuheng Zhang
Keyword(s):  
Josephson Current ◽  
Normal Metal

scholarly journals Understanding the Josephson Current through a Kondo-Correlated Quantum Dot

2012 ◽  
Vol 108 (22) ◽  
Author(s):  
D. J. Luitz ◽  
F. F. Assaad ◽  
T. Novotný ◽  
C. Karrasch ◽  
V. Meden
Keyword(s):  
Quantum Dot ◽  
Josephson Current

scholarly journals Josephson effect in junctions of conventional and topological superconductors

2018 ◽  
Vol 9 ◽  
pp. 1659-1676 ◽  
Author(s):  
Alex Zazunov ◽  
Albert Iks ◽  
Miguel Alvarado ◽  
Alfredo Levy Yeyati ◽  
Reinhold Egger
Keyword(s):  
Bound States ◽  
Josephson Effect ◽  
Mean Field ◽  
Josephson Current ◽  
Field Analysis ◽  
Current Phase ◽  
Topological Superconductor ◽  
Topological Superconductors ◽  
Spin Singlet ◽  
Hybrid Devices

We present a theoretical analysis of the equilibrium Josephson current-phase relation in hybrid devices made of conventional s-wave spin-singlet superconductors (S) and topological superconductor (TS) wires featuring Majorana end states. Using Green’s function techniques, the topological superconductor is alternatively described by the low-energy continuum limit of a Kitaev chain or by a more microscopic spinful nanowire model. We show that for the simplest S–TS tunnel junction, only the s-wave pairing correlations in a spinful TS nanowire model can generate a Josephson effect. The critical current is much smaller in the topological regime and exhibits a kink-like dependence on the Zeeman field along the wire. When a correlated quantum dot (QD) in the magnetic regime is present in the junction region, however, the Josephson current becomes finite also in the deep topological phase as shown for the cotunneling regime and by a mean-field analysis. Remarkably, we find that the S–QD–TS setup can support φ0-junction behavior, where a finite supercurrent flows at vanishing phase difference. Finally, we also address a multi-terminal S–TS–S geometry, where the TS wire acts as tunable parity switch on the Andreev bound states in a superconducting atomic contact.

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