Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.9: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Optical Response of Multi-orbital Superconductors: Role of Fermi Surface Topology and Geometry — •Meghdad Yazdani-Hamid1, Mehdi Biderang2, and Akbari Alireza3 — 1Department of Physics, Bu-Ali Sina University, 65178, 016016 Hamedan, Iran — 2Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada — 3Beijing Institute of Mathematical Sciences and Applications (BIMSA), Huairou District, Beijing 101408, China
Motivated by the sensitivity of Sr2RuO4 to Fermi surface reconstructions under strain,
we investigate how Fermi surface geometry and Van Hove singularities influence the optical Hall
response and polar Kerr effect. Within a three-orbital model, we explore the impact of chemical
potential and interlayer hopping on superconducting pairing and response functions. We find that
dx2−y2 and dx2−y2+ig symmetries are the leading candidates for the quasi-2D orbital,
while a chiral p-wave state in the quasi-1D orbitals is essential for generating an accessible Kerr
angle. Increasing interlayer hopping amplifies coherence factors,
producing sharp signatures in Tc and optical transport. Inter-orbital charge transfer further
enhances these effects by modifying the balance between quasi-1D and quasi-2D contributions.
These results provide a framework for interpreting Kerr effect experiments in
multi-orbital superconductors.
[1] M. Yazdani-Hamid, M. Biderang, A. Akbari, arXive:2501.14254
Keywords: Multiband superconductivity; Magneto-optical Kerr effect; Spin-orbit coupling; Superconducting gap; Spin-singlet /Spin-triplet pairing