Ultrafast dynamics of unconventional carriers, phonons, and density-wave orders in Kagome metals

• Applicant: Dr. Ece Uykur
• Subject Area: Experimental Condensed Matter Physics
• Term: since 2024
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 544301747

Kagome metals recently attracting enormous attention because the underlying kagome structure leads to various interesting properties. Based on theoretical predictions, these compounds host topologically non-trivial linear bands with massless Dirac fermions and flat bands with localized massive electrons. This creates a suitable playground to investigate the interaction between strong electronic correlations and topological properties. Magnetic and non-magnetic kagome metals are recently become available: FeSn-binaries and RMn6Sn6 intermetallics emerged as the promising magnetic ones, whereas the AV3Sb5 family falls into the category of non-magnetic kagome metals. In this project, we will investigate the ultrafast dynamics of unconventional charge carriers, phonons, and density-wave orders in these compounds. The focus will be on the following points: (i) Ultrafast transient reflectivity will be studied on different class of materials and the common features will be identified. (ii) By studying magnetic and non-magnetic counterparts, effect of magnetism will be discussed. (iii) The direct effects of kagome lattice will be investigated by tuning the properties in-planes and out-of-plane directions. (iv) External pressure will also be used to tune the kagome lattice directly and phenomena emerging within this lattice will be studied. (v) Finally, the effect of phonons and the consequences in the limit of proximity to the density-wave orders will be investigated.

• DFG Programme: Research Grants