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Light-induced percolative topological phase transition in type-II Weyl semimetal WTe2

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arxiv 2406.16663 v2 pith:D3UZ32NP submitted 2024-06-24 cond-mat.mtrl-sci

Xiaoyue Zhou , Fu Deng , Yifan Gao , Yi Chan , Shulei Li , Ning Wang , Junwei Liu , Jingdi Zhang This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords dynamiclight-inducedpercolativephasephoto-excitedstateterahertztopological
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We report on an ultrafast terahertz free-carrier dynamic study of a photo-excited WTe2 thin film. In the photo-excited state, we observe a metastable electronic state featuring negative differential terahertz photoconductivity and reduced scattering rate. Detailed electrodynamics analysis and first-principal calculation attribute it to light-induced topological phase transition, reducing density of states near the Fermi level. Furthermore, the emergence of an unconventional temporal isosbestic point marks a dynamic universality, strongly suggesting a percolative interaction between the two topologically distinct phases.

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  1. Purcell enhancement of photogalvanic currents in a van der Waals plasmonic self-cavity

    cond-mat.mes-hall 2025-07 conditional novelty 6.0 of 10

    Photogalvanic edge currents in WTe2 are enhanced by plasmonic self-cavity modes, producing a geometry-tunable terahertz emission resonance near 0.25 to 0.4 THz.

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