Triplet Josephson current modulated by Rashba spin–orbit coupling

Yang, Zhuohui; Wang, Jun; Chan, K. S.

doi:10.1088/0953-8984/22/4/045302

Cited by 6 publications

(6 citation statements)

References 29 publications

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“…We show that the effect is robust against any spin independent scattering. Proximity effect in SOC materials has been considered previously, [18,19] but with only Rashba SOC, which does not produce longrange effects discussed below.…”

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confidence: 99%

Long-Range Spin-Triplet Helix in Proximity Induced Superconductivity in Spin-Orbit-Coupled Systems

2014

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We study proximity induced triplet superconductivity in a spin-orbit-coupled system, and show that the d vector of the induced triplet superconductivity undergoes precession that can be controlled by varying the relative strengths of Rashba and Dresselhaus spin-orbit couplings. In particular, a long-range spin-triplet helix is predicted when these two spin-orbit couplings have equal strengths. We also study the Josephson junction geometry and show that a transition between 0 and π junctions can be induced by controlling the spin-orbit coupling with a gate voltage. An experimental setup is proposed to verify these effects. Conversely, the observation of these effects can serve as a direct confirmation of triplet superconductivity.

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confidence: 99%

Long-Range Spin-Triplet Helix in Proximity Induced Superconductivity in Spin-Orbit-Coupled Systems

2014

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“…For example, the π junction without TRS breaking can be realized in a spin-orbit coupled junction between two triplet-superconductors. [24] No matter the difference in TRS, the common point in two types of π junctions is that the Andreev bound states (ABS) change mainly the phase shift compared with the conventional ABS in the transition, while the energy range of ABS (we refer to it as the amplitude of ABS from now on) keeps nearly unchanged. That is to say, the supercurrent carried by each set of spin-split ABS keeps nearly unchanged in the transition, but the phase difference between two sets of spin-split ABS determines the oscillation of critical current.…”

Section: Introductionmentioning

confidence: 99%

Novel 0– π transitions in Josephson junctions between noncentrosymmetric superconductors

2016

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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.

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“…The Josephson junction has been attracting considerable attention of researchers for the past few decades, not only because it has fundamental research interest, in particular as a phase-sensitive test of the pairing symmetry of unconventional superconductors, and in the study of the interplay of superconductivity and magnetism, but also it is a basic building block for superconducting electronics with applications that range from SQUID magnetometers to possible quantum computing devices. Since the finding of significant experimental evidence in favor of tripletspin pairing in superconductors, such as (TMTSF) 2 X [1], Sr 2 RuO 4 [2][3][4], and some heavy-fermion materials [5], lots of works [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] were dedicated to studying spin-related transport properties of triplet-superconductor (TS) Josephson junctions.…”

Section: Introductionmentioning

confidence: 99%

Spin and charge transport in hybrid triplet Josephson junctions

Wang

Yang

et al. 2011

Supercond. Sci. Technol.

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We report a theoretical study on the spin and charge transport in hybrid triplet Josephson junctions, of which the triplet pair potentials could have both different orbital symmetries and spin states. Based on a lattice model and a Hamiltonian method, we find that the spin/charge supercurrent is proportional to sin2φ with φ being the macroscopic superconducting phase, coming from the second-order Josephson effect, when the orbital symmetries of pair potentials in the two triplet superconductors are orthogonal to each other. A dissipationless transverse spin current is also found flowing at the interface of the junction and its polarization points along the cross-product of two d vectors, which arises from the combined effect of the orthogonal orbital symmetries and misalignment of d vectors. In a special hybrid junction, where the zero-energy states are absent at the interface of the junction, there is no net spin supercurrent flowing through the junction although two d vectors can be perpendicular to each other, whereas a mode-resolved spin supercurrent is flowing in the system instead.

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Triplet Josephson current modulated by Rashba spin–orbit coupling

Cited by 6 publications

References 29 publications

Long-Range Spin-Triplet Helix in Proximity Induced Superconductivity in Spin-Orbit-Coupled Systems

Long-Range Spin-Triplet Helix in Proximity Induced Superconductivity in Spin-Orbit-Coupled Systems

Novel 0– π transitions in Josephson junctions between noncentrosymmetric superconductors

Spin and charge transport in hybrid triplet Josephson junctions

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