Wolfgang Himmler, Ralf Fischer, Michael Barth, Jacob Fuchs, Dmitriy A. Kozlov, Nikolay N. Mikhailov, Sergey A. Dvoretsky, Christoph Strunk, Cosimo Gorini, Klaus Richter, and Dieter Weiss
Phys. Rev. Research 5, 043021 (2023) – Published 9 October 2023
Phys. Rev. Research 5, L042004 (2023) – Published 4 October 2023
Vortex beams, light beams with a spiral-shaped wave front around their propagation axis, can generate a spiral Higgs wave in superconductors. The orbital angular momentum of light stimulates the phase mode to screen the longitudinal magnetic field of the vortex beam, which amplifies the intensity of third-harmonic generation mediated by the Higgs mode.
Phys. Rev. Research 5, L022058 (2023) – Published 21 June 2023
The two-particle vertex function contains all scattering processes from the electron-hole interaction and is a key component in evaluating susceptibilities. A study demonstrates how its orbital-selective, dynamic nature determines the peak structure of the spin susceptibility in the momentum space for Hund’s metallic SrRuO within the DFT + DMFT framework, which in turn leads to specific superconducting gap symmetries.