Kagome metals: Experimental puzzles and theoretical possibilities
Author: Neupert, Titus
Affiliation: University of Zurich
Type: Invited Talk
Session: Kagome superconductors and charge order
Date and Time: 20.07.2026, 10:45 - 11:15
Kagome metals have emerged as a fertile platform for exploring the interplay between lattice geometry, electronic correlations, and topology. Recent experimental discoveries—most notably in the AV3Sb5 family—have revealed an unexpected and unusually rich phenomenology. In this talk, I will focus on a selection of experimental observations associated with the superconducting and charge‑ordered phases that stand out as particularly puzzling. These include the appearance of a pair‑density‑wave state hosting unexpected in‑gap states, an apparent decoupling into two superconducting gaps revealed at high magnetic fields, and filamentary superconducting transport that runs counter to conventional expectations for current flow in superconductors. In the normal state, transport measurements further reveal magnetic‑field‑induced current oscillations, suggestive of a remarkable long‑range phase coherence whose microscopic origin remains unclear.
Despite intense theoretical activity, no unified framework has yet emerged that can account for these observations. I will therefore present arguments aimed at (i) clarifying why these results are genuinely surprising in the context of existing paradigms, and (ii) outlining what should—and should not—be inferred from them about the underlying electronic state of kagome superconductors. Overall, these materials offer a timely opportunity to revisit foundational questions about (un)conventional superconductivity in a setting where (quantum) geometry plays a central and active role.