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TT: Fachverband Tiefe Temperaturen

TT 56: Superconductivity: Theory I

TT 56.6: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, CHE/0089

Fluctuation conductivity in multicomponent superconductors — •Sondre Duna Lundemo and Asle Sudbø — Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway

Multicomponent superconductors exhibit many properties that have no counterpart in single-component superconductors, ranging from Leggett modes to novel topological phase transitions. These features derive from the multiorbital character of the parent metallic state, and sometimes leave universal signatures in physical observables. In this talk, we scrutinize the electrodynamic response of such a metal as it approaches the superconducting critical point. In particular, we will elucidate whether the multicomponent character of the incipient superconducting order affects the electrical conductivity and highlight the importance of using a gauge-invariant approximation scheme for calculating it.

Keywords: Superconducting fluctuations; Critical phenomena; Electromagnetic response; Multicomponent superconductivity