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.

arXiv comment7+3 pages, 4+1 figures

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• Theory of Tunneling Spectroscopy in Unconventional $p$-wave Magnet-Superconductor Hybrid Structures
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• Transport across junctions of altermagnets with normal metals and ferromagnets
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• Fingerprint of Non-Hermiticity in d-wave Altermagnet
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• Unconventional superconductivity of an altermagnetic metal: Polarized BCS and inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states
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• Thermodynamic properties of a superconductor interfaced with an altermagnet
• Light-induced odd-parity altermagnets on dimerized lattices
• Superconducting Order Parameters in Spin Space Groups: Methodology and Application
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• Real Chern insulators in two-dimensional altermagnetic Fe${}_2$S${}_2$O and Fe${}_2$Se${}_2$O
• Nonlocal damping of spin waves in a magnetic insulator induced by normal, heavy, or altermagnetic metallic overlayer: A Schwinger-Keldysh field theory approach
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
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