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

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ID: 101811
2018
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Abstract
Nonequilibrium many-body dynamics is becoming a central topic in condensed matter physics. Floquet topological states were suggested to emerge in photodressed bands under 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 ab initio calculations for a time-dependent self-consistent light-reduced Hubbard U and nonequilibrium magnetism simulations for quantum quenches, we find dynamically modified magnetic order giving rise to transiently emerging Weyl cones that can be 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.
Reference Key
topp2018allopticalnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Topp, Gabriel E;Tancogne-Dejean, Nicolas;Kemper, Alexander F;Rubio, Angel;Sentef, Michael A;
Journal Nature communications
Year 2018
DOI
10.1038/s41467-018-06991-8
URL
http://link.springer.com/article/10.1038/s41467-018-06991-8
Keywords
cuprates electron–phonon coupling insulator–metal transition ultrafast optics

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