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TT: Fachverband Tiefe Temperaturen
TT 57: Correlated Magnetism – Kagome Systems
TT 57.11: Vortrag
Mittwoch, 11. März 2026, 17:45–18:00, CHE/0091
Superconductivity in Kagome metals due to soft loop-current fluctuations — •Daniel Schultz1, Grgur Palle2, Asimpunya Mitra3, Yong-Baek Kim3, Rafael Fernandes2, and Jörg Schmalian1 — 1Institute for Theoretical Condensed Matter Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Department of Physics, The Grainger College of Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA — 3Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada
We demonstrate that soft fluctuations of translation symmetry-breaking loop currents provide a mechanism for unconventional superconductivity in Kagome metals that naturally addresses the multiple superconducting phases observed under pressure. Focusing on the rich multi-orbital character of these systems, we show that loop currents involving both vanadium and antimony orbitals generate low-energy collective modes that couple efficiently to electrons near the Fermi surface and mediate attractive interactions in two distinct unconventional pairing channels. While loop-current fluctuations confined to vanadium orbitals favor chiral d+id superconductivity, which spontaneously breaks time-reversal symmetry, the inclusion of antimony orbitals stabilizes an s± state that is robust against disorder. We argue that these two states are realized experimentally as pressure increases and the antimony-dominated Fermi surface sheet undergoes a Lifshitz transition.
Keywords: Kagome metal; loop current; superconductivity; fluctuation; multiband