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Chin. Phys. B, 2016, Vol. 25(9): 097403    DOI: 10.1088/1674-1056/25/9/097403
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Novel 0-π transitions in Josephson junctions between noncentrosymmetric superconductors

Jun-Feng Liu(刘军丰)1, Huan Zhang(张欢)1, Jun Wang(汪军)2
1. Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China;
2. Department of Physics, Southeast University, Nanjing 210096, China
Abstract  We study the Josephson effect between two noncentrosymmetric superconductors (NCSs) with opposite polarization vectors of Rashba spin-orbit coupling (RSOC). We find a 0-π transition driven by the triplet-singlet ratio of NCSs. Different from conventional 0-π transitions, the Andreev bound states change their energy range instead of phase shift in the 0-π transition found here. This novel property results in a feature that the critical current becomes almost zero at the transition point, not only a minimum. Furthermore, when the directions of RSOC polarization vectors are the same in two NCSs, the similar effect can also be found in the presence of a perpendicular exchange field or a Dresselhause spin-orbit coupling in the interlayer. We find novel oscillations of critical current without 0-π transition. These novel 0-π transitions or oscillations of critical current present new understanding of the Josephson effect and can also serve as a tool to determine the unknown triplet-singlet ratio of NCSs.
Keywords:  noncentrosymmetric superconductors      Josephson effect      0-π transition  
Received:  07 June 2016      Accepted manuscript online: 
PACS:  74.50.+r (Tunneling phenomena; Josephson effects)  
  74.70.Tx (Heavy-fermion superconductors)  
  74.20.Rp (Pairing symmetries (other than s-wave))  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11204187 and 11274059).
Corresponding Authors:  Jun Wang     E-mail:  jwang@seu.edu.cn

Cite this article: 

Jun-Feng Liu(刘军丰), Huan Zhang(张欢), Jun Wang(汪军) Novel 0-π transitions in Josephson junctions between noncentrosymmetric superconductors 2016 Chin. Phys. B 25 097403

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