Novel 0-π transitions in Josephson junctions between noncentrosymmetric superconductors

doi:10.1088/1674-1056/25/9/097403

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

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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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