Tunable second harmornic in altermagnetic Josephson junctions

Abstract

We study the influence of external electric and Zeeman fields on the Josephson effect in a planar superconductor/altermagnet/superconductor junction. Remarkably, we find that the current-phase relation (CPR) can be forward or backward skewed due to a pronounced second harmonic term. It decisively depends on the altermagnetic field strength. This second harmonic can be measured directly using double SQUID devices. The CPR skewness can be effectively manipulated by electric gating. Moreover, we identify two additional impacts of external electric and magnetic fields on the Josephson current: (i) Fields can induce 0-$\pi$ transitions. (ii) Fields can substantially enhance the critical current. This enhancement is surprising since supercurrents are typically suppressed by magnetic fields.

8 pages

References in corpus (40)

• Coupling of two superconductors through a ferromagnet : evidence for a pi-junction
• Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
• Crystal Hall effect in Collinear Antiferromagnets
• Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets
• Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering
• Broken Kramers' degeneracy in altermagnetic MnTe
• Giant and tunneling magnetoresistance effects from anisotropic and valley-dependent spin-momentum interactions in antiferromagnets
• Spin current generation in organic antiferromagnets
• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Direct observation of altermagnetic band splitting in CrSb thin films
• Prediction of unconventional magnetism in doped FeSb2
• Antiferromagnetism in RuO${}_2$ as $d$-wave Pomeranchuk instability
• Observation of Giant Band Splitting in Altermagnetic MnTe
• Itinerant Antiferromagnetism in RuO${}_2$
• Enhancement of the Josephson current by an exchange field in superconductor-ferromagnet structures
• Spin-group symmetry in magnetic materials with negligible spin-orbit coupling
• Large band-splitting in $g$-wave type altermagnet CrSb
• Controllable 0-pi Josephson junctions containing a ferromagnetic spin valve
• Fermi liquid instabilities in the spin channel
• dc Josephson Effect in Altermagnets
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals
• The Josephson diode effect in supercurrent interferometers
• Finite-momentum Cooper pairing in proximitized altermagnets
• Twisted Magnetic Van der Waals Bilayers: An Ideal Platform for Altermagnetism
• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• Andreev reflection at the altermagnet-superconductor interface
• Spin-split collinear antiferromagnets: a large-scale ab-initio study
• Phase-shifted Andreev levels in an altermagnet Josephson junction
• Altermagnetic superconducting diode effect
• Bilayer stacking A-type altermagnet: A general approach to generating two-dimensional altermagnetism
• Observation of Josephson Harmonics in Tunnel Junctions
• Orientation-dependent Josephson effect in spin-singlet superconductor/altermagnet/spin-triplet superconductor junctions
• $\phi$ Josephson junction induced by altermagnetism
• Superconductor-altermagnet memory functionality without stray fields
• Fulde-Ferrell-Larkin-Ovchinnikov state induced by antiferromagnetic order in $\kappa$-type organic conductors
• Detection of second-order topological superconductors by Josephson junctions
• Spin-polarized Specular Andreev Reflections in Altermagnets
• Large Second-Order Josephson Effect in Planar Superconductor-Semiconductor Junctions
• Direct measurement of a $\sin (2\phi )$ current phase relation in a graphene superconducting quantum interference device
• Crossover from relativistic to non-relativistic net magnetization for MnTe altermagnet candidate

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• Conditions for orbital selective altermagnetism in Sr${}_2$RuO${}_4$: tight binding model, similarities with cuprates and implications on superconductivity
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• Josephson current signature of Floquet Majorana and topological accidental zero modes in altermagnet heterostructures
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• Signatures of superconducting Higgs mode in irradiated Josephson junctions
• Interplay between Superconductivity and Altermagnetism in Disordered Materials and Heterostructures
• Current switching behavior mediated via hinge modes in higher-order topological phases using altermagnets
• AC Josephson Signatures of the Superconducting Higgs Mode
• Altermagnetism Induced Bogoliubov Fermi Surfaces Form Topological Superconductivity
• Josephson effects in the spin-triplet superconductor/altermagnet/spin-triplet superconductor junctions: the detection of the intrinsic $\mathbf{d}$-vector
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