Quasiclassical theory of superconducting spin-splitter effects and spin-filtering via altermagnets

Hans Gløckner Giil; Bjørnulf Brekke; Jacob Linder; Arne Brataas

doi:10.1103/PhysRevB.110.L140506

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Quasiclassical theory of superconducting spin-splitter effects and spin-filtering via altermagnets

Hans Gløckner Giil, Bjørnulf Brekke, Jacob Linder, Arne Brataas

DOI 10.1103/PhysRevB.110.L140506 · Physical Review B

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Abstract

Conducting altermagnets have recently emerged as intriguing materials supporting strongly spin-polarized currents without magnetic stray fields. We demonstrate that altermagnets enable three key functionalities, merging superconductivity and spintronics. The first prediction is a controllable supercurrent-induced edge magnetization, which acts like a dissipationless spin-splitter effect. The second and third predictions are a Cooper pair spin-splitter and a filtering effect, respectively. These effects allow for spatial separation of triplet pairs with opposite spin polarizations and spin-selective tunneling of Cooper pairs. We derive a quasiclassical theory with associated boundary conditions that describe these phenomena and explain how they can be experimentally verified. Our results open a new path for spatial control of spin signals via triplet Cooper pairs using hybrid superconductor-altermagnet devices.

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Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown