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ETSF online seminar by Laura Urquiza: Friday Oct ... (No replies)

berger

9 months ago

berger 9 months ago

Dear colleagues,

 

The next ETSF seminar will be given by Laura Urquiza from the Ecole Polytechnique in Palaiseau on Friday October 20 at 14:00 CEST. 

The title of the talk is “Probing excitons in α-Al2O3 through resonant inelastic x-ray scattering”. 

Below you will find an abstract of the seminar.

 

The session is open to everyone, i.e., there is no waiting room, so please do not post the zoom link online.

Please use your full name and surname (no abbreviations or nick names) when connecting to zoom.

 

Best wishes,
Arjan Berger

 

 

Abstract:

 

Resonant inelastic X-ray scattering (RIXS) is a powerful technique for studying elementary excitations due to its element and orbital specificity, as well as its access to a wide range of energies and momenta. The theoretical description of the RIXS double differential cross-section is typically carried out using all-electron calculations. Here, we present a study of shallow-core excitations at the L-edges of aluminum in α-Al2O3 using a pseudopotential plane-wave framework. Since strong excitonic effects have been observed in the optical [1] and core [2] absorption spectra of alumina, we perform the calculations using the Bethe-Salpeter equation (BSE), which is the state-of-the-art technique for describing electron-hole interactions. 

In our work, we address the question of the validity of the pseudopotential approximation for RIXS spectra of shallow-core edges. We investigate the limits of the pseudization of the wave functions in many-body BSE calculations and the advantages of treating all the valence and shallow-core electrons on the same footing.

 

 

[1] Marinopoulos et.al, Phys. Rev. B 83 (2011) 195129
[2] Mogi et.al, Materials Transactions, 45 (2004) 2031-2034