scholarly journals Bound states and Josephson current in mesoscopics-wave superconductor–normal-metal–d-wave superconductor junctions

1996 ◽  
Vol 54 (10) ◽  
pp. 7354-7359 ◽  
Author(s):  
Jian-Xin Zhu ◽  
Z. D. Wang ◽  
H. X. Tang
Keyword(s):  
Bound States ◽  
Josephson Current ◽  
Normal Metal ◽  
D Wave

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 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.

scholarly journals d-Wave–Induced Josephson Current Counterflow inYBa2Cu3O7/NbZigzag Junctions

2002 ◽  
Vol 88 (5) ◽  
Author(s):  
H. J. H. Smilde ◽  
Ariando ◽  
D. H. A. Blank ◽  
G. J. Gerritsma ◽  
H. Hilgenkamp ◽  
...  
Keyword(s):  
Josephson Current ◽  
Wave Induced ◽  
D Wave

INTERFACE SCATTERING EFFECT ON JOSEPHSON CURRENT IN A d-WAVE SUPERCONDUCTOR/d-WAVE SUPERCONDUCTOR JUNCTION

2011 ◽  
Vol 25 (02) ◽  
pp. 131-140 ◽  
Author(s):  
YAN-HUA LIAO ◽  
JIAN LI ◽  
FENG WANG
Keyword(s):  
Critical Current ◽  
Phase Relation ◽  
Josephson Current ◽  
Current Phase ◽  
Insulator Layer ◽  
Axis Orientation ◽  
Scattering Effect ◽  
Interface Scattering ◽  
Layer I ◽  
D Wave

By taking into account the interface scattering effect in a d-wave superconductor (S)/insulator layer (I)/d-wave superconductor (S) junction, the temperature dependence of the critical current and the current-phase relation are studied theoretically. It is found that both the barrier scattering and the roughness scattering at the interface always suppress the Andreev reflection and the current-phase relation is almost sinusoidal in the junction. The Josephson current strongly depends on the crystalline axis orientation of the d-wave superconductor in the junction. Some different phenomena appear depending on whether the crystal orientations of the superconductors on the two sides are the same or not, and this is mainly presented in the influence of the zero-energy states formation at the interface on the critical current which changes with temperature and phase.

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