Light-Induced Ideal Weyl Semimetal in HgTe via Nonlinear Phononics

Shin, D.; Rubio, A.; Tang, P.

doi:10.1103/PhysRevLett.132.016603

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Light-Induced Ideal Weyl Semimetal in HgTe via Nonlinear Phononics

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Shin, D.
Department of Physics and Photon Science, Gwangju Institute of Science and Technology (GIST);
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

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Rubio, A.
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;
Nano-Bio Spectroscopy Group, Departamento de Fisica de Materiales, Universidad del País Vasco UPV/EHU;
Center for Computational Quantum Physics (CCQ), The Flatiron Institute;

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Tang, P.
School of Materials Science and Engineering, Beihang University;
Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Center for Free-Electron Laser Science;

External Resource

https://arxiv.org/abs/2311.09583
(Preprint)

https://doi.org/10.1103/PhysRevLett.132.016603
(Publisher version)

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PhysRevLett.132.016603.pdf
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Supplementary Material (public)

SM_THz_HgTe.pdf
(Supplementary material), 27MB

Citation

Shin, D., Rubio, A., & Tang, P. (2024). Light-Induced Ideal Weyl Semimetal in HgTe via Nonlinear Phononics. Physical Review Letters, 132(1): 016603. doi:10.1103/PhysRevLett.132.016603.

Cite as: https://hdl.handle.net/21.11116/0000-000C-8AC9-6

Abstract

Interactions between light and matter allow the realization of out-of-equilibrium states in quantum solids. In particular, nonlinear phononics is one of the most efficient approaches to realizing the stationary electronic state in nonequilibrium. Herein, by an extended ab initio molecular dynamics method, we identify that long-lived light-driven quasistationary geometry could stabilize the topological nature in the material family of HgTe compounds. We show that coherent excitation of the infrared-active phonon mode results in a distortion of the atomic geometry with a lifetime of several picoseconds. We show that four Weyl points are located exactly at the Fermi level in this nonequilibrium geometry, making it an ideal long-lived metastable Weyl semimetal. We propose that such a metastable topological phase can be identified by photoelectron spectroscopy of the Fermi arc surface states or ultrafast pump-probe transport measurements of the nonlinear Hall effect.