Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 66: Ultrafast Dynamics of Light-Driven Systems
TT 66.9: Vortrag
Freitag, 5. April 2019, 12:00–12:15, H2
All-optical nonequilibrium pathway to stabilizing magnetic Weyl semimetals in pyrochlore iridates — •Gabriel E. Topp1, Nicolas Tancogne-Dejean1, Alexander F. Kemper2, Angel Rubio1, 3, and Michael A. Sentef1 — 1Max Planck Institute for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, 22761 Hamburg, Germany — 2Department of Physics, North Carolina State University, Raleigh, NC, USA — 3Center for Computational Quantum Physics (CCQ), Flatiron Institute, 162 Fifth Avenue, New York NY 10010
The 227 pyrochlore iridates were conjectured to exhibit an antiferromagnetically ordered Weyl semimetallic (AF-WSM) phase provided that one could tune the ordered magnetic moment. In our work [1] we propose an ultrafast nonequilibrium pathway to engineering a nonequilibrium AF-WSM phase with short laser pulses. Relying on ab initio TDDFT+U calculations, we investigate the open-system dynamics after an interaction quench in a mean-field dynamics simulation starting from the AFI phase. By computational time- and angle-resolved photoemission spectroscopy (tr-ARPES) measurements, we track the emergence of nonequilibrium Weyl fermions on a femtosecond timescale.
G. E. Topp et al., Nature Communications 9, 4452 (2018)