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  • Open Access

Spin-polarized Andreev molecules and anomalous nonlocal Josephson effects in altermagnetic junctions

Sayan Mondal and Jorge Cayao*

  • Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden

  • *Contact author: jorge.cayao@physics.uu.se
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Phys. Rev. Research 8, 033223 – Published 24 August, 2026

DOI: https://doi.org/10.1103/l42w-8qrz

Abstract

Altermagnetism has emerged as a promising ingredient for realizing nontrivial Josephson phases but so far explored in single Josephson junctions. In this work, we consider the coherent coupling of two Josephson junctions with spin-singlet s-wave superconductivity and demonstrate that d-wave altermagnetism gives rise to spin-polarized Andreev molecules due to the hybridization of Andreev bound states of each junction when the coupling is weak. Interestingly, these spin-polarized Andreev molecules induce anomalous nonlocal Josephson effect, where the current flow across one Josephson junction due to phase changes across the other junction develops 0−π and ϕ0 transitions originating from altermagnetism. Furthermore, the nonlocal Josephson current carried by spin-polarized Andreev molecules exhibits nonreciprocal critical currents, enabling a nonlocal Josephson diode effect whose polarity is tunable by the altermagnetic strength and right phase. Our findings put forward altermagnetism as a promising arena for designing nonlocal spin Josephson phenomena.

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Phys. Rev. Research 8, 033223– Published 24 August, 2026
  • Received 16 March 2026
  • Accepted 23 July 2026
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