DQMP Seminar

28.02.2023 13:00 – 14:00

Kagome metals


The recent discovery of AV3Sb5 (A=K,Rb,Cs) has uncovered an intriguing arena for exotic Fermi surface instabilities in kagome metals. Aside from charge density wave order, a multi-dome superconducting phase is found, with strong indications to be of unconventional origin in terms of possible time reversal symmetry breaking and electronically mediated many-body instabilities. We find that the sublattice interference mechanism is necessary and sufficient to uncover the nature of unconventional particle-hole and particle-particle order in the V net kagome metals. Depending on the specific absolute and relative interaction strengths, we predict a Peierls-type charge density wave with finite relative angular momentum and orbital current formation. With regard to the possible nature of unconventional pairing, we find a rich phase diagram including pair density wave order that depends on the range of the screened electronic interactions, the multi-orbital content, and the location of multiple van Hove singularities with respect to the Fermi level. Combined, kagome metals open a new domain of unconventional electronic order, unfolding a plethora of fascinating experimental and theoretical investigations.


Organizers : Prof. D. Abanin & Prof. F. von Rohr

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

entrée libre