ESPCI web site
April 16 at 2:00 pm (Paris time)
Room Charpak, entrance building, ground floor
Terahertz spectroscopy of thin NbN films
Terahertz (THz) spectroscopy offers unique access to the key properties of superconductors, such as the superconducting gap, penetration depth, quasiparticle behavior, vortex dynamics, and non-equilibrium relaxation. I will illustrate the advantages and limitations of this approach through our previous work on high-quality thin NbN films showcasing measurements from zero field up to 7 Tesla in both Faraday and Voigt geometries [1]. This research is primarily aimed to critically test models based on BCS theory and to understand the complex behavior of vortices under various conditions.
[1] Šindler, M., Herman, F., Kadlec, F., & Kadlec, C. (2025). Deeper insight into the terahertz response of conventional superconductors under magnetic field. Physical Review B, 112(9), 094512.
[2] Kadlec, C., Kadlec, F., & Šindler, M. (2022, August). Superconductor-insulator transition in a NbN film under in-plane magnetic field. In 2022 Millimeter and Terahertz Waves (IRMMW-THz) (pp. 1-2). IEEE.
