Topic : Unconventional Electronic Instabilities in Kagome Superconductors

Speaker : Prof. Ming Shi (Zhejiang University, China)

Date & Time : 2024. 12. 04(Wed.) 4:30 PM

Place :  Room No. 31214, Natural Science Building 1

Abstract : 

Exploring exotic electronic orders and their underlying driving forces remains a central pursuit in the field of quantum materials. Within this context, the kagome lattice, a corner-sharing triangle network, has emerged as a versatile platform for exploring unconventional correlated and topological quantum states. Due to the unique correlation effects and frustrated lattice geometry inherent to kagome lattices, several families of kagome metals have been found to display  a  variety  of  exotic electronic  instabilities  and  nontrivial  topologies,  including unconventional superconductivity, charge density wave orders, and electronic nematicity, reminiscent of the complex competing orders observed in high-temperature superconductors.

Against this backdrop, kagome systems offer an exceptional quantum playground for delving into the origins of the unconventional electronic instabilities. In this talk, I will present our recent work, focusing on two notable kagome superconductors: the unconventional CDW in AV3Sb5 (A = K, Rb, Cs), and the electronic nematicity observed in ATi3Bi5. I shall also discuss the fundamental role of lattice degrees of freedom in promoting the CDW in topological kagome metal ScV6Sn6. Drawing particularly from the insights derived from angle-resolved photoemission  spectroscopy  (ARPES),  I  will  highlight  the  unique  characteristics  of  these systems, shedding light on their intriguing electronic behavior and elucidating their underlying mechanisms.