SÉMINAIRE ANNULÉ / SEMINAR CANCELLED
Spectroscopic signatures of topology in the particle-hole continuum of nodal point semimetals
Département de physique
Université de Sherbrooke
Abstract: I will discuss how the presence of topological nodal points in the bulk three-dimensional electronic band structure of a material is reflected in its particle-hole excitation spectrum. I will first highlight some geometric characteristics of the particle-hole continuum of a noninteracting electron system when nodal points are present in its energy dispersion, either below or above the Fermi level. I will then argue that resonant inelastic x-ray scattering (RIXS) is an appealing tool for directly accessing and studying the features of the particle-hole continuum of topological semimetals, especially in settings that preclude the use of other probes. Going a step further, I will discuss how polarization-resolved RIXS can be used to visualize the Berry curvature distribution around Weyl nodes and thus determine their topological charge. This indicates the potential for a spectroscopic measurement of quantized topological invariants using RIXS. I will conclude with a quick overview of ongoing experimental work.
Profil of Prof. Kourtis on Google Scholar.