SÉMINAIRE ANNULÉ / SEMINAR CANCELLED
Spectroscopic signatures of topology in the particle-hole continuum of nodal point semimetals
Stefanos Kourtis
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.
Cette conférence est présentée par le RQMP Versant Nord du Département de physique de l'Université de Montréal et de Génie physique de la Polytechnique.
