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Add to Calendar 10/25/2019 1:00 pm 10/25/2019 America/Chicago Condensed Matter Seminar: "Spectroscopic signatures of topology in the particle-hole continuum of nodal point semimetals." DESCRIPTION:

I will discuss how the presence of topological nodal points in the bulk three-dimensional electronic band structure of a material can be inferred by resolving its particle-hole continuum in energy and momentum. 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, such as within magnetic fields. 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 measurement of quantized topological invariants using RIXS. I will conclude with a quick overview of ongoing experimental and theoretical work.

\n\nSPEAKER: Stefanos Kourtis, Boston University
190 ESB false

Condensed Matter Seminar: "Spectroscopic signatures of topology in the particle-hole continuum of nodal point semimetals."

Speaker Stefanos Kourtis, Boston University
Date: 10/25/2019
Time: 1 p.m.
Location: 190 ESB
Sponsor: Physics - Condensed Matter
Event Type: Seminar/Symposium
 

I will discuss how the presence of topological nodal points in the bulk three-dimensional electronic band structure of a material can be inferred by resolving its particle-hole continuum in energy and momentum. 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, such as within magnetic fields. 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 measurement of quantized topological invariants using RIXS. I will conclude with a quick overview of ongoing experimental and theoretical work.

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