SPICE Workshop on Hybrid Correlated States and Dynamics in Quantum Materials, May 14th - 16th 2024
Sebastian Bergeret
Considerable attention is currently directed towards the study of superconducting systems exhibiting transport properties dependent upon the direction of charge currents. Non-reciprocal transport effects have been proposed and observed in various structures, driven by the search of a superconducting diode, i.e. a superconducting device with a critical current dependent on the direction of the applied current. Beyond potential applications, the physics underlying non-reciprocal effects is notably intricate, particularly in systems where superconductivity coexists with spin-dependent fields, giving rise to emergent states. In this presentation, I will discuss the superconducting diode effect and its intricate connections with other closely related phenomena. These encompass anomalous currents and Josephson junctions, the helical phase observed in Rashba superconductors, and magnetoelectric effects induced by isotropic spin-orbit coupling. The talk aims not only to elucidate the physics of non-reciprocal effects but also to examine the broader implications of these phenomena in diverse superconducting structures.
Some related references to the discussed topics:
He, Wen-Yu, and Kam Tuen Law. "Magnetoelectric effects in gyrotropic superconductors." Physical Review Research 2.1 (2020): 012073.
S. Ilic and F. Bergeret. "Theory of the supercurrent diode effect in Rashba superconductors with arbitrary disorder."
Physical Review Letters 128.17 (2022): 177001.
Hou, Yasen, et al. "Ubiquitous superconducting diode effect in superconductor thin films." Physical Review Letters 131.2 (2023): 027001.
T. Kokkeler, Ilya Tokatly, and FS Bergeret. "Nonreciprocal superconducting transport and the spin Hall effect in gyrotropic structures."
P. Virtanen, FS Bergeret, and IV Tokatly, I. V. (2022). "Nonlinear σ model for disordered systems with intrinsic spin-orbit coupling." Physical Review B, 105(22) (2022), 224517.