Andreev reflection at the altermagnet-superconductor interface

Abstract

Altermagnets are a new class of magnetic materials, which exhibit large spin splitting, but due to the combined spin and real space group symmetry protection maintain zero net macroscopic magnetization. Such a characteristic may prove them to be superior in applications in superconducting heterostructures and thus here we investigate the Andreev reflection at the altermagnet/superconductor interface. We compare and contrast altermagnets to other magnetic materials, revealing qualitative differences in the behavior of altermagnetic junction depending on the Fermi surface orientation. We study the resonant states arising in setups with strong tunneling barriers and show that sensitivity to non-magnetic disorder is also dependent on the orientation. Our results provide a building block for altermagnetic superconducting heterostructures such as Josephson $\pi$ junctions with superior properties.

7+3 pages, 4+1 figures

References in corpus (3)

• Phase-shifted Andreev levels in an altermagnet Josephson junction
• Manifestation of the odd-frequency spin-triplet pairing state in diffusive ferromagnet / superconductor junctions
• Majorana Fermions in Magnetic Chains

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• Minimal Models and Transport Properties of Unconventional $p$-Wave Magnets
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• Superconductor-altermagnet memory functionality without stray fields
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• Theory of Tunneling Spectroscopy in Unconventional $p$-wave Magnet-Superconductor Hybrid Structures
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• Ferromagnetic Materials for Josephson π Junctions
• Transport across junctions of altermagnets with normal metals and ferromagnets
• Tunable second harmornic in altermagnetic Josephson junctions
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• Many-body effects on superconductivity mediated by double-magnon processes in altermagnets
• Classification of pair symmetries in superconductors with unconventional magnetism
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• Nonlinear Superconducting Magnetoelectric Effect
• Design of altermagnetic models from spin clusters
• RKKY interaction in Rashba altermagnets
• G-type Antiferromagnetic BiFeO${}_3$ is a Multiferroic $g$-wave Altermagnet
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• Pair Density Waves and Supercurrent Diode Effect in Altermagnets
• Orientation-dependent transport in junctions formed by $d$-wave altermagnets and $d$-wave superconductors
• Spin-polarized Specular Andreev Reflections in Altermagnets
• Anisotropic light-tailored RKKY interaction in two-dimensional $d$-wave altermagnets
• All-electrically controlled spintronics in altermagnetic heterostructures
• Tunneling Magnetoresistance Effect in Altermagnets
• Crossed Andreev reflection in collinear $p$-wave magnet/triplet superconductor junctions
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• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
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• Altermagnetic Instabilities from Quantum Geometry
• Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
• Floquet engineering spin triplet states in unconventional magnets
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• Altermagnetism Induced Topological Phase Transitions in Kane-Mele Model
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• Andreev reflection for MnTe altermagnet candidate
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• Fingerprint of Non-Hermiticity in d-wave Altermagnet
• Conditions for orbital selective altermagnetism in Sr${}_2$RuO${}_4$: tight binding model, similarities with cuprates and implications on superconductivity
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• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
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• Tunneling spin Hall effect induced by unconventional $p$-wave magnetism
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