Magnetoanisotropic spin-triplet Andreev reflection in ferromagnet-Ising superconductor junctions

Abstract

We theoretically study the electronic transport through a ferromagnet-Ising superconductor junction. A tight-binding Hamiltonian describing the Ising superconductor is presented. Then by combing the non-equilibrium Green's function method, the expressions of Andreev reflection coefficient and conductance are obtained. A strong magnetoanisotropic spin-triplet Andreev reflection is shown, and the magnetoanisotropic period is $\pi$ instead of $2\pi$ as in the conventional magnetoanisotropic system. We demonstrate a significant increase of the spin-triplet Andreev reflection for the single-band Ising superconductor. Furthermore, the dependence of the Andreev reflection on the incident energy and incident angle are also investigated. A complete Andreev reflection can occur when the incident energy is equal to the superconductor gap, regardless of the Fermi energy (spin polarization) of the ferromagnet. For the suitable oblique incidence, the spin-triplet Andreev reflection can be strongly enhanced. In addition, the conductance spectroscopies of both zero bias and finite bias are studied, and the influence of gate voltage, exchange energy, and spin-orbit coupling on the conductance spectroscopy are discussed in detail. The conductance reveals a strong magnetoanisotropy with period $\pi$ as the Andreev reflection coefficient. When the magnetization direction is parallel to the junction plane, a large conductance peak always emerges at the superconductor gap. This work offers a comprehensive and systematic study of the spin-triplet Andreev reflection, and has underlying application of $\pi$-periodic spin valve in spintronics.

10 pages, 9 figures

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Cited by in corpus (15)

• Magnetic field-induced "mirage" gap in an Ising superconductor
• Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors
• Tunable planar Josephson junctions driven by time-dependent spin-orbit coupling
• Switch effect and $0$-$\pi$ transition in Ising superconductor Josephson junctions
• Enhancement of crossed Andreev reflection in a Kitaev ladder connected to normal metal leads
• Spin-triplet superconductor$-$quantum anomalous Hall insulator$-$spin-triplet superconductor Josephson junctions: $0$-$\pi$ transition, ${\varphi }_0$ phase and switch effects
• Controlling charge and spin transport in an Ising-superconductor Josephson junction
• Spin Transport in Normal Metal-Ising Superconductor Junction
• Double refraction and spin splitter in a normal-hexagonal semiconductor junction
• Andreev reflection in normal metal/charge-4e superconductor junctions
• Signatures of enhanced spin-triplet superconductivity induced by interfacial properties
• Evidence for anisotropic spin-triplet Andreev reflection at the 2D van der Waals ferromagnet/superconductor interface
• Rashba spin-orbit coupling enhanced magnetoresistance in junctions with one ferromagnet
• Specular-Andreev reflection and Andreev interference in an Ising superconductor junction
• Spin transport in a normal meta-altermagnetic superconducting nanowire junction