SPICE Workshop on Quantum Functionalities of Nanomagnets, June 17th - 19th 2025
Sebastián Bergeret
In recent years, condensed matter research has increasingly focused on materials and hybrid structures where superconductivity interacts with spin-dependent fields. This interplay gives rise to unconventional superconducting states[1], with implications for spintronics and quantum technologies, shaping the field of superconducting spintronics[2,3].
In this talk, I will provide an overview of key developments in the field, revisiting works on triplet superconductivity in ferromagnet/superconductor heterostructures and highlighting recent advances in understanding transport phenomena arising from the interplay between superconductivity and generic spin-dependent fields[4-6]. In particular, I will discuss effects such as spin-polarized supercurrents, anomalous Josephson phases, helical superconductivity, and the superconducting diode effect.
References:
[1] F.S. Bergeret, A. F. Volkov, and K. B. Efetov. "Odd triplet superconductivity and related phenomena in superconductor-ferromagnet structures." Reviews of modern physics 77.4 (2005): 1321-1373.
[2] J. Linder, and J.W.A. Robinson. "Superconducting spintronics." Nature Physics 11.4 (2015): 307-315.
[3] M. Eschrig, "Spin-polarized supercurrents for spintronics: a review of current progress." Reports on Progress in Physics 78.10 (2015): 104501.
[4] F. S. Bergeret, and I. V. Tokatly. "Singlet-Triplet Conversion and the Long-Range Proximity Effect in Superconductor-Ferromagnet Structures with Generic Spin Dependent Fields." Physical Review Letters 110.11 (2013): 117003.
[5] T. Kokkeler, I. V. Tokatly, and F. S. Bergeret. "Nonreciprocal superconducting transport and the spin Hall effect in gyrotropic structures." SciPost Physics 16.2 (2024): 055.
[6] T. Kokkeler, F. S. Bergeret, and I. V. Tokatly. "A universal phenomenology of charge-spin interconversion and dynamics in diffusive systems with spin-orbit coupling." arXiv preprint arXiv:2405.06334. To be published in PRL.