Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunneling and Josephson Junctions
TT 55.11: Vortrag
Donnerstag, 4. April 2019, 12:15–12:30, H23
Tunneling Anomalous Hall (TAH) Effect in Ferromagnet/Superconductor Junctions — •Andreas Costa1, Alex Matos-Abiague2, and Jaroslav Fabian1 — 1University of Regensburg, Germany — 2Wayne State University Detroit, USA
The competition of two antagonistic interactions, spin-singlet superconducting pairing and ferromagnetic exchange, in one heterojunction leads to extraordinary phenomena. Owing to the additionally broken inversion symmetry in such systems, not only the interplay of superconductivity and ferromagnetism, but also the induced strong spin-orbit fields (SOFs) offer interesting subjects for experimental and theoretical investigations; several studies unraveled an intriguing impact of interfacial SOFs on transport already in normal-conducting systems, e.g., TAMR [1] and TAH [2] effects. Our theoretical work focuses on ferromagnet/superconductor junctions, demonstrating the existence of a superconducting TAH effect. While the effect’s fundamental characteristics are comparable to the normal-conducting analog [2], our numerical simulations predict a much larger tunability of the TAH conductance in the superconducting scenario. Together with the prediction of a simultaneously generated transverse supercurrent response in the superconductor, these findings might offer an interesting future perspective for experimentalists.
This work was supported by ENB IDK Topological Insulators and by DFG SFB No. 1277 (project B07).
Phys. Rev. Lett. 99, 056601 (2007)
Phys. Rev. Lett. 115, 056602 (2015)