2025/09/17 by Bijay Kumar Sahoo, Abhiram Soori, Sahoo, Bijay Kumar +2 · 1 voice · 2 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Atomic and Subatomic Physics Research #Quantum and electron transport phenomena
paper · pdf · doi:10.1103/ydrg-7spp
We predict a field-free transverse Josephson diode effect in altermagnets (AMs) with Rashba spin--orbit coupling, achieving diode efficiencies exceeding 3000% and unidirectional transverse supercurrents in four-terminal junctions. In this geometry, a longitudinal phase bias generates transverse supercurrents that exhibit nonreciprocity and a finite anomalous phase shift, while the longitudinal current itself displays a Josephson diode effect. Both responses are tunable via the Néel vector orientation. We further show that the effect remains robust against moderate disorder and imperfect interfaces. These results establish AMs as a promising platform for nonreciprocal superconducting transport, with clear routes toward experimental realization.