Finite-momentum Cooper pairing in proximitized altermagnets

Abstract

Finite-momentum Cooper pairing is an unconventional form of superconductivity that is widely believed to require finite magnetization. Altermagnetism is an emerging magnetic phase with highly anisotropic spin-splitting of specific symmetries, but zero net magnetization. Here, we study Cooper pairing in metallic altermagnets connected to conventional $s$-wave superconductors. Remarkably, we find that the Cooper pairs induced in the altermagnets acquire a finite centre-of-mass momentum, despite the \textit{zero} net magnetization in the system. This anomalous Cooper-pair momentum strongly depends on the propagation direction and exhibits unusual symmetric patterns. Furthermore, it yields several unique features: (i) highly orientation-dependent oscillations in the order parameter, (ii) controllable 0-$\pi$ transitions in the Josephson supercurrent, (iii) large-oblique-angle Cooper-pair transfer trajectories in junctions parallel with the direction where spin splitting vanishes, and (iv) distinct Fraunhofer patterns in junctions oriented along different directions. Finally, we discuss the implementation of our predictions in candidate materials such as RuO${}_2$ and KRu${}_4$O${}_8$.

11 pages, 6 figures, Published in Nature Communications

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Cited by in corpus (109)

• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Landau Theory of Altermagnetism
• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism
• Altermagnetic Routes to Majorana Modes in Zero Net Magnetization
• Altermagnetic superconducting diode effect
• Mirror Chern Bands and Weyl Nodal Loops in Altermagnets
• Creation and Manipulation of Higher-Order Topological States by Altermagnets
• Minimal Models and Transport Properties of Unconventional $p$-Wave Magnets
• Non-relativistic spin splitting in compensated magnets that are not altermagnets
• Superconducting phenomena in systems with unconventional magnets
• $\phi$ Josephson junction induced by altermagnetism
• Superconductor-altermagnet memory functionality without stray fields
• Altermagnetism in the layered intercalated transition metal dichalcogenide CoNb${}_4$Se${}_8$
• Unconventional p-wave and finite-momentum superconductivity induced by altermagnetism through the formation of Bogoliubov Fermi surface
• Altermagnetism and superconductivity in a multiorbital t-J model
• Josephson effect and odd-frequency pairing in superconducting junctions with unconventional magnets
• Ferromagnetic Materials for Josephson π Junctions
• Coulomb Drag in Altermagnets
• Transport across junctions of altermagnets with normal metals and ferromagnets
• Tunable second harmornic in altermagnetic Josephson junctions
• Quasiclassical theory of superconducting spin-splitter effects and spin-filtering via altermagnets
• Many-body effects on superconductivity mediated by double-magnon processes in altermagnets
• Classification of pair symmetries in superconductors with unconventional magnetism
• Unconventional superconductivity in altermagnets with spin-orbit coupling
• Altermagnetic Ground State in Distorted Kagome Metal CsCr${}_3$Sb${}_5$
• Nonlinear Superconducting Magnetoelectric Effect
• Topological responses from gapped Weyl points in 2D altermagnets
• G-type Antiferromagnetic BiFeO${}_3$ is a Multiferroic $g$-wave Altermagnet
• Design of altermagnetic models from spin clusters
• 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
• Finite-momentum superconductivity in two-dimensional altermagnets with a Rashba-type spin-orbit coupling
• Emergence of tunable exceptional points in altermagnet-ferromagnet junctions
• Adatom engineering magnetic order in superconductors: Applications to altermagnetic superconductivity
• Superconducting Diode Effect in Multiphase Superconductors
• Interplay of Altermagnetic Order and Wilson Mass in the Dirac Equation: Helical Edge States without Time-Reversal Symmetry
• Phase-modulated superconductivity via altermagnetism
• Impurity states in altermagnetic superconductors
• Phonon-mediated spin-polarized superconductivity in altermagnets
• Intra-unit-cell singlet pairing mediated by altermagnetic fluctuations
• Superconducting Diode Effect in Quantum Spin Hall Insulator-based Josephson Junctions
• Spin and pair density waves in 2D altermagnetic metals
• Interplay between altermagnetism and topological superconductivity on an unconventional superconducting platform
• Superconducting diode efficiency from singlet-triplet mixing in disordered systems
• Ubiquitous van der Waals altermagnetism with sliding/moire ferroelectricity
• Pseudo-Ising superconductivity induced by $p$-wave magnetism
• Anomalous-Hall Neel textures in altermagnetic materials
• Floating Edge Bands in the Bernevig-Hughes-Zhang model with Altermagnetism
• Field-sensitive dislocation bound states in two-dimensional $d$-wave altermagnets
• Altermagnetism from coincident Van Hove singularities: application to $\kappa$-Cl
• Fingerprint of Non-Hermiticity in d-wave Altermagnet
• Andreev bound states and supercurrent in an unconventional superconductor-altermagnetic Josephson junction
• From local spin nematicity to altermagnets: Footprints of band topology
• Unconventional superconductivity of an altermagnetic metal: Polarized BCS and inhomogeneous Fulde-Ferrell-Larkin-Ovchinnikov states
• Magnetic impurities in an altermagnetic metal
• Conditions for orbital selective altermagnetism in Sr${}_2$RuO${}_4$: tight binding model, similarities with cuprates and implications on superconductivity
• Tunable Josephson diode effect in singlet superconductor-altermagnet-triplet superconductor junctions
• Exploring d-Wave Magnetism in Cuprates from Oxygen Moments
• Thermodynamic properties of a superconductor interfaced with an altermagnet
• Fractionalized Altermagnets: from neighboring and altermagnetic spin-liquids to spin-symmetric band splitting
• Light-induced Odd-parity Magnetism in Conventional Collinear Antiferromagnets
• Light-induced odd-parity altermagnets on dimerized lattices
• Two-Dimensional Altermagnetic Iron Oxyhalides: Real Chern Topology and Valley-Spin-Lattice Coupling
• Light-induced Floquet spin-triplet Cooper pairs in unconventional magnets
• Tunneling conductance in superconducting junctions with $p$-wave unconventional magnets breaking time-reversal symmetry
• Josephson current signature of Floquet Majorana and topological accidental zero modes in altermagnet heterostructures
• Real Chern insulators in two-dimensional altermagnetic Fe${}_2$S${}_2$O and Fe${}_2$Se${}_2$O
• Designing Non-Relativistic Spin Splitting in Oxide Perovskites
• Quantum Lifshitz points in an altermagnetic metal
• Néel vector controlled exceptional contours in $p$-wave magnet-ferromagnet junctions
• Altermagnetic polarons: the fate of alter magnetic band splittings at strong coupling
• Electric and spin current vortices in altermagnets
• Exploration of Altermagnetism in $\mathrm{Ru}{\mathrm{O}}_2$
• Energy Dispersion, Superconductivity and Magnetic Fluctuations in Stacked Altermagnetism Materials
• Magnetic-field-tuned randomness in inhomogeneous altermagnets
• Bypassing the lattice BCS-BEC crossover in strongly correlated superconductors: resilient coherence from multiorbital physics
• Spin-Polarized Josephson Supercurrent in Nodeless Altermagnets
• Altermagnetism, ARPES, symmetry, non-relativistic band splitting
• Engineering subgap states in superconductors by the symmetry of altermagnetism
• Magnetic-Field and Strain Engineering of Modulated Transverse Transport in Altermagnetic Topological Materials
• Inherent momentum-dependent gap structure of altermagnetic superconductors
• Approximate half-integer quantization in anomalous planar transport in $d$-wave altermagnets
• Efficiency of the superconducting diode effect of pair-density-wave states in two-dimensional $d$-wave altermagnets
• Inverse proximity effect in thin-film superconductor/magnet heterostructures with metallic and insulating magnets
• Spin-dependent quasiparticle lifetimes in altermagnets
• $d$-Wave Polarization-Spin Locking in Two-Dimensional Altermagnets
• Viscoelastic tensor and hydrodynamics of altermagnets
• Odd-Parity Magnetism in Fe-Based Superconductors
• Finite-momentum mixed singlet-triplet pairing in chiral antiferromagnets induced by even-parity spin texture
• Enhancement of Josephson Supercurrent in a $\pi$-Junction state by Chiral Antiferromagnetism
• Rational Control of Magnonic and Electronic Band Splittings
• Altermagnetism-driven FFLO superconductivity in finite-filling 2D lattices
• Marginal Metals and Kosterlitz-Thouless Type Phase Transition in Disordered Altermagnets
• Josephson diode and spin-valve effects on the surface of altermagnet CrSb
• Cartesian Nodal Lines and Magnetic Kramers Weyl Nodes in Spin-Split Antiferromagnets
• Van-Hove singularities and competing instabilities in an altermagnetic metal
• Interplay between Superconductivity and Altermagnetism in Disordered Materials and Heterostructures
• Higher-order topological insulators in two-dimensional antiferromagnetic and altermagnetic chromium-based group-IV chalcogenides
• Altermagnetism from the viewpoint of chemistry
• Spin-Valley Locking and Pure Spin-Triplet Superconductivity in Noncollinear Antiferromagnets Proximitized to Conventional Superconductors
• Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling
• Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity
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• Second-order topological insulator induced by compensated altermagnetism without bulk spin splitting
• Spin triplet pairing by suppressing altermagnetism