Probing the electronic topological transitions of WTe2 under pressure using ultrafast spectroscopy

Kai Zhang; Fuhai Su; Dayong Liu; Wenjun Wang; Yongsheng Zhang; Zhi Zeng; Zhe Qu; Alexander F. Goncharov

Probing the electronic topological transitions of WTe2 under pressure using ultrafast spectroscopy

Strongly Correlated Electrons 2023-03-10 v1

Authors: Kai Zhang , Fuhai Su , Dayong Liu , Wenjun Wang , Yongsheng Zhang , Zhi Zeng , Zhe Qu , Alexander F. Goncharov

Abstract

We investigate the nonequilibrium photocarrier dynamics of WTe2 under pressure using the optical pump-probe spectroscopy. The pressure dependences of the electronic relaxation manifest anomalous changes around 0.8, 3.5, and 6 GPa, indicating the abruptions in the electron-phonon interactions. In addition, the coherent phonon oscillations originating from shear mode suddenly disappears above 3.5 GPa, which marks the onset of Td-1T' structural phase transition. Supported by the theoretical calculation, we unveil the electronic topological transitions (ETTs), especially an emergence of a new type-II Weyl point for Td-WTe2 under pressure. Our work demonstrates a novel route to probe the ETTs under pressure.

Keywords

WTe2 ultrafast spectroscopy electronic topological transitions pressure Weyl point structural phase transition

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@article{arxiv.2303.04974,
  title  = {Probing the electronic topological transitions of WTe2 under pressure using ultrafast spectroscopy},
  author = {Kai Zhang and Fuhai Su and Dayong Liu and Wenjun Wang and Yongsheng Zhang and Zhi Zeng and Zhe Qu and Alexander F. Goncharov},
  journal= {arXiv preprint arXiv:2303.04974},
  year   = {2023}
}

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8 pages, 3 figures

Probing the electronic topological transitions of WTe2 under pressure using ultrafast spectroscopy

Abstract

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