Josephson current in a normal-metal nanowire coupled to a superconductor/ferromagnet/superconductor junction

Ebisu, Hiromi; Lu, Bo; Taguchi, Kohji; Golubov, A. A.; Tanaka, Yukio

doi:10.1103/physrevb.93.024509

Cited by 12 publications

(15 citation statements)

References 86 publications

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“…SESAR measurements have indeed provided evidence for the zero-energy modes in vortices of the p-wave superconducting Bi 2 Te 3 /NbSe 2 heterostructures 3,4 . Similar ideas have been also considered for the Josephson-type junctions 5,6 and ferromagnet-superconductor interfaces with the spin-orbit coupling 7,8 . In this work we demonstrate that SESAR spectroscopy can test inherent polarization of the Majorana quasiparticles appearing at the edges of the Rashba chain.…”

Section: Introductionmentioning

confidence: 89%

Polarization of the Majorana quasiparticles in the Rashba chain

Maśka¹,

Domański²

2017

Sci Rep

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We demonstrate that the selective equal–spin Andreev reflection (SESAR) spectroscopy can be used in STM experiments to distinguish the zero–energy Majorana quasiparticles from the ordinary fermionic states of the Rashba chain. Such technique, designed for probing the p–wave superconductivity, could be applied to the intersite pairing of equal–spin electrons in the chain of magnetic Fe atoms deposited on the superconducting Pb substrate. Our calculations of the effective pairing amplitude for individual spin components imply the magnetically polarized Andreev conductance, which can be used to ‘filter’ the Majorana quasiparticles from the ordinary in–gap states, although the pure spin current (i.e., perfect polarization) is impossible.

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Section: Introductionmentioning

confidence: 89%

Polarization of the Majorana quasiparticles in the Rashba chain

Maśka¹,

Domański²

2017

Sci Rep

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“…Still, while the existence of such intrinsic odd‐ω order parameters remains an intriguing theoretical question, a great deal of progress has been made studying the emergence of odd‐ω pair correlations in systems with conventional equal‐time order parameters . This latter possibility relies on the conversion of intrinsic even‐ω superconducting correlations to odd‐ω correlations, with a number of proposals in the literature realizing such symmetry conversion through a variety of different mechanisms …”

Section: Introductionmentioning

confidence: 99%

The Role of Odd‐Frequency Pairing in Multiband Superconductors

2020

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Recent progress in the understanding of multiband superconductivity and its relationship to odd‐frequency pairing are reviewed herein. The discussion begins by reviewing the emergence of odd‐frequency pairing in a simple two‐band model, providing a brief pedagogical overview of the formalism. Several examples of multiband superconducting systems are examined, in each case describing both the origin of the band degree of freedom and the nature of the odd‐frequency pairing. Throughout, it is attempted to convey a unified picture of how odd‐frequency pairing emerges in these materials and propose that similar mechanisms are responsible for odd‐frequency pairing in several analogous systems: layered 2D heterostructures, double quantum dots, double nanowires, Josephson junctions, and systems described by isolated valleys in momentum space. In addition, experimental probes of odd‐frequency pairing in multiband systems are reviewed, focusing on hybridization gaps in the electronic density of states, paramagnetic Meissner effect, and Kerr effect.

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“…Here the reflection matrix is written in the basis (c ↑ , c ↓ , c † ↓ , −c † ↑ ) T with c as the electron annihilation operator. The blocks a 0 s 0 and a i s i describe the Andreev reflections in the spin-singlet and spin-triplet channels, respectively [41][42][43].…”

Section: Intrinsic π-Phasementioning

confidence: 99%

Reveal the nematic topological superconductivity from the anisotropic unconventional Josephson effect: Theory and application to doped Bi2Se3

Leng

Liu

2021

Sci. China Phys. Mech. Astron.

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We propose a scheme to reveal the possible nematic superconducting order parameter in the doped Bi 2 Se 3 by observing the anisotropic unconventional Josephson effect without an external magnetic field. We find the presence of an intrinsic π-phase in the spin-triplet channel of Andreev reflection. Its competition with the odd-parity superconducting gap phase can lead to unconventional Josephson effect in the Josephson junction, whose normal region is connected to the same side of the superconductor, called the U-shaped junction according to its geometry. For Josephson junctions with the interfaces perpendicular to the nematic direction, the competition will lead to a Josephson π-junctions. In the case where the interface is parallel to the nematic direction, it will lead to a Josephson 0-junction. Thus, this can directly reflect the nematic superconductivity. It is worth noting that Josephson coupling with the 4π period appears only in the normal injected channels. Interestingly, if the Josephson junction adopts a conventional geometry, it always exhibits a normal Josephson 0-junction regardless of the gap function taken by the doped Bi 2 Se 3 and therefore cannot distinguish the pairing symmetry. We thus propose a superconducting quantum interference device containing a U-shaped Josephson junction to detect nematic superconductivity. This proposal not only can be applied to detect nematic superconductivity but also provides a feasible platform for topological quantum computation.

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Josephson current in a normal-metal nanowire coupled to a superconductor/ferromagnet/superconductor junction

Cited by 12 publications

References 86 publications

Polarization of the Majorana quasiparticles in the Rashba chain

Polarization of the Majorana quasiparticles in the Rashba chain

The Role of Odd‐Frequency Pairing in Multiband Superconductors

Reveal the nematic topological superconductivity from the anisotropic unconventional Josephson effect: Theory and application to doped Bi2Se3

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