Seminarium Fizyki Materii Skondensowanej

In recent years, the chiral phonons with a quantized pseudoangular momentum were predicted theoretically and studied in various types of systems. During the seminar, I will present the calculation method, which enables to obtain the phonon dispersion relations and to analyze chiral properties of phonons. We applied this approach to investigate the lattice dynamics and structural phase transitions in the series of CoSn-like compounds containing kagome and honeycomb 2D lattices. I will discuss also the mechanism of charge ordering in the kagome superconductors AV3Sb5 (A=K,Cs,Rb).