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Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Superconductivity: Tunneling and Josephson Junctions

TT 42.12: Vortrag

Donnerstag, 20. März 2025, 12:30–12:45, H32

Tunneling in Altermagnet/Superconductor/Altermagnet Junctions — •Marcel Polák1, František Herman1, Andreas Costa2, and Jaroslav Fabian21Comenius University Bratislava, Slovakia — 2University of Regensburg, Germany

Their unprecedented spectral characteristics---particularly their large local magnetic exchange splittings in momentum space without rising an overall net spin polarization---make altermagnets promising candidates for engineering strongly spin-polarized currents in superconducting heterostructures.

In this talk, we will focus on lateral altermagnet/superconductor/ altermagnet junctions in the ballistic limit to theoretically explore the ramifications of their d-wave-like spin-split Fermi surfaces on superconducting transport. We will demonstrate that the subgap interplay of Andreev and quasiparticle tunnelings, and thereby the experimentally accessible tunneling conductance, is tunable through the absolute and relative orientations of the altermagnets' Fermi surfaces, recovering the two important limiting cases in which the altermagnets behave either rather like normal metals or ferromagnets. Finally, we will also investigate geometrical conductance oscillations at supergap voltages in the presence of resonant scattering and compare our results against the ferromagnetic junction counterpart.

This work has been supported by Contract no. APVV-23-0515, by the European Union's Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 945478 and by DFG Grants 314695032 (SFB 1277) and 454646522.

Keywords: Altermagnet/Superconductor/Altermagnet Junctions; d-wave-like spin-split Fermi surfaces; superconducting transport; geometrical conductance oscillations

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