DQMP Seminar - Dr. Mark H. Fischer - Phenomenology of unconventional orders in Kagome metals

21.11.2023 13:00 – 14:00

The family of Kagome metals AV3Sb5 with A = K, Rb, Cs has attracted a lot of attention recently for the wealth of exotic phases its members exhibit. In particular, all three members enter a charge-density-wave phase at ~100 K and below a critical temperature of ~2 K, they become superconducting. While experimental results agree on an in-plane 2x2 reconstruction due to the charge density wave, the out-of-plane wave vector and exact nature of the ordered phase, specifically whether it breaks additional point-group or time-reversal symmetries in the form of loop-currents, has yet to be determined unambiguously. In addition, very little is known about the superconducting state. After an introduction to the current experimental situation in this intriguing material family, I will discuss possible charge-density-wave phases and their interplay from a symmetry perspective. With multiple conflicting experiments and no clear microscopic understanding, a phenomenological description in the form of a Ginzburg-Landau analysis offers valuable insights. I will argue that the picture emerging in this material class is one of correlated orders at a tipping point.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

entrée libre