All-optical nonequilibrium pathway to stabilising magnetic Weyl semimetals in 
pyrochlore iridates

Topp, G.; Tancogne-Dejean, N.; Kemper, A. F.; Rubio, A.; Sentef, M. A.

doi:10.1038/s41467-018-06991-8

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All-optical nonequilibrium pathway to stabilising magnetic Weyl semimetals in pyrochlore iridates

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Topp, G.
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free Electron Laser Science;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Tancogne-Dejean, N.
Center for Free Electron Laser Science;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Rubio, A.
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Computational Quantum Physics (CCQ), Flatiron Institute;

Sentef, M. A.
Center for Free Electron Laser Science;
Theoretical Description of Pump-Probe Spectroscopies in Solids, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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https://arxiv.org/abs/1803.07447
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https://dx.doi.org/10.1038/s41467-018-06991-8
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Citation

Topp, G., Tancogne-Dejean, N., Kemper, A. F., Rubio, A., & Sentef, M. A. (2018). All-optical nonequilibrium pathway to stabilising magnetic Weyl semimetals in pyrochlore iridates. Nature Communications, 9: 4452. doi:10.1038/s41467-018-06991-8.

Cite as: https://hdl.handle.net/21.11116/0000-0005-DF86-9

Abstract

Nonequilibrium many-body dynamics is becoming one of the central topics of modern condensed matter physics. Floquet topological states were suggested to emerge in photodressed band structures in the presence of periodic laser driving. Here we propose a viable nonequilibrium route without requiring coherent Floquet states to reach the elusive magnetic Weyl semimetallic phase in pyrochlore iridates by ultrafast modification of the effective electron-electron interaction with short laser pulses. Combining \textit{ab initio} calculations for a time-dependent self-consistent reduced Hubbard U controlled by laser intensity and nonequilibrium magnetism simulations for quantum quenches, we find dynamically modified magnetic order giving rise to transiently emerging Weyl cones that are probed by time- and angle-resolved photoemission spectroscopy. Our work offers a unique and realistic pathway for nonequilibrium materials engineering beyond Floquet physics to create and sustain Weyl semimetals. This may lead to ultrafast, tens-of-femtoseconds switching protocols for light-engineered Berry curvature in combination with ultrafast magnetism.