Speaker
Dr
Aki Pulkkinen
(University of Fribourg)
Description
YNi$_2$B$_2$C is a borocarbide superconductor with a complex electronic band structure that has a very strong Ni character near the Fermi energy. We present density functional theory (DFT) and one-step model of photoemission results for YNi$_2$B$_2$C and compare them to experimental soft x-ray angle resolved photoemission spectroscopy (SX-ARPES) measurements.
We show that electron correlations have to be included, using dynamical mean field theory (DMFT) applied to the Ni d-states, to reach the best agreement with experiments. One-step model calculations are essential to ensure the comparison between DFT and ARPES.
Authors
Dr
Aki Pulkkinen
(University of Fribourg)
Frank Weber
(Karlsruhe Institute of Technology)
Geoffroy Kremer
(Université Paris-Saclay)
Vladimir Strocov
(Paul Scherrer Institute)
Jan Minar
(New Technologies-Research Center, University of West Bohemia)
Claude Monney
(University of Fribourg)