Creating stable Floquet-Weyl semimetals by laser-driving of 3D Dirac materials.

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ID: 101815
2017
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Abstract
Tuning and stabilizing topological states, such as Weyl semimetals, Dirac semimetals or topological insulators, is emerging as one of the major topics in materials science. Periodic driving of many-body systems offers a platform to design Floquet states of matter with tunable electronic properties on ultrafast timescales. Here we show by first principles calculations how femtosecond laser pulses with circularly polarized light can be used to switch between Weyl semimetal, Dirac semimetal and topological insulator states in a prototypical three-dimensional (3D) Dirac material, NaBi. Our findings are general and apply to any 3D Dirac semimetal. We discuss the concept of time-dependent bands and steering of Floquet-Weyl points and demonstrate how light can enhance topological protection against lattice perturbations. This work has potential practical implications for the ultrafast switching of materials properties, such as optical band gaps or anomalous magnetoresistance.
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hubener2017creatingnature Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Hübener, Hannes;Sentef, Michael A;De Giovannini, Umberto;Kemper, Alexander F;Rubio, Angel;
Journal Nature communications
Year 2017
DOI
10.1038/ncomms13940
URL
Keywords
cuprates electron–phonon coupling insulator–metal transition ultrafast optics

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