Spin-polarized Specular Andreev Reflections in Altermagnets

Abstract

We show theoretically that specular Andreev reflection occurs stably at altermagnet--superconductor interfaces, which is a phenomenon that has previously been predicted only in a limited range of materials, such as Dirac/Weyl materials with fine-tuned chemical potentials. Furthermore, the characteristic spin-split bands of the altermagnet lead to a distinctive spin polarization in the specular Andreev reflections. By utilizing this feature, we propose a device that integrates the functions of both a Cooper pair splitter and a spin beam splitter, thereby creating energy-entangled electron pairs. The positive nonlocal conductance and the positive noise cross-correlation are unambiguous signatures of specular Andreev reflections in the proposed device.

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Cited by in corpus (16)

• Superconducting phenomena in systems with unconventional magnets
• Tunable second harmornic in altermagnetic Josephson junctions
• Classification of pair symmetries in superconductors with unconventional magnetism
• Topological responses from gapped Weyl points in 2D altermagnets
• Orientation-dependent transport in junctions formed by $d$-wave altermagnets and $d$-wave superconductors
• All-electrically controlled spintronics in altermagnetic heterostructures
• Floquet engineering spin triplet states in unconventional magnets
• Thermodynamic properties of a superconductor interfaced with an altermagnet
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• Viscoelastic tensor and hydrodynamics of altermagnets
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Josephson diode and spin-valve effects on the surface of altermagnet CrSb
• Enhanced Andreev Reflection in Flat-Band Systems: Wave Packet Dynamics, DC Transport and the Josephson Effect