Chirality manipulation of ultrafast phase switches in a correlated CDW-Weyl semimetal.
In: Nature Communications, Jg. 15 (2024-01-26), Heft 1, S. 1-8
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Zugriff:
Light engineering of correlated states in topological materials provides a new avenue of achieving exotic topological phases inaccessible by conventional tuning methods. Here we demonstrate a light control of correlation gaps in a model charge-density-wave (CDW) and polaron insulator (TaSe 4 ) 2 I recently predicted to be an axion insulator. Our ultrafast terahertz photocurrent spectroscopy reveals a two-step, non-thermal melting of polarons and electronic CDW gap via the fluence dependence of a longitudinal circular photogalvanic current. This helicity-dependent photocurrent reveals continuous ultrafast phase switches from the polaronic state to the CDW (axion) phase, and finally to a hidden Weyl phase as the pump fluence increases. Additional distinctive attributes aligning with the light-induced switches include: the mode-selective coupling of coherent phonons to the polaron and CDW modulation, and the emergence of a non-thermal chiral photocurrent above the pump threshold of CDW-related phonons. The demonstrated ultrafast chirality control of correlated topological states here holds large potentials for realizing axion electrodynamics and advancing quantum-computing applications. The charge-density-wave Weyl semimetal (TaSe 4 ) 2 I is a candidate for an axion insulator, however it may be obscured by polaron physics. Here, using ultrafast terahertz photocurrent spectroscopy, the authors realize phase switches from the polaronic state, to the charge density wave phase, and to the Weyl phase. [ABSTRACT FROM AUTHOR]
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Titel: |
Chirality manipulation of ultrafast phase switches in a correlated CDW-Weyl semimetal.
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Autor/in / Beteiligte Person: | Cheng, Bing ; Cheng, Di ; Jiang, Tao ; Xia, Wei ; Song, Boqun ; Mootz, Martin ; Luo, Liang ; Perakis, Ilias E. ; Yao, Yongxin ; Guo, Yanfeng ; Wang, Jigang |
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Zeitschrift: | Nature Communications, Jg. 15 (2024-01-26), Heft 1, S. 1-8 |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 2041-1723 (print) |
DOI: | 10.1038/s41467-024-45036-1 |
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