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<p>Understanding the interplay between topology and correlated electron states is central to the study of quantum materials. TaTe<sub>4</sub> is a quasi-one-dimensional charge density wave (CDW) compound predicted to host topological phases, making it a model platform to explore this interplay. Here, we combine high-field magnetotransport measurements with density functional theory calculations to provide a comprehensive mapping of the Fermi surface (FS) of TaTe<sub>4</sub> in its CDW phase. Using multiple current-field geometries, we resolve the four largest of six pockets of the FS predicted by theory and find no evidence of non-CDW bands, highlighting the full reconstruction of the FS in the bulk. We identify a previously unobserved quasi-cylindrical pocket and uncover a large size orbit consistent with magnetic breakdown between reconstructed FS sheets, from which we estimate a CDW gap of &#xa0;~&#xa0;0.29 eV. Moreover, we observe a robust linear magnetoresistance that persists across all field directions when current flows perpendicular to the 1D chains along which the CDW is formed, with a distinct high-field linear regime emerging when field is along the chains. These findings establish TaTe<sub>4</sub> as a prototypical material to study the coexistence of correlation-driven reconstruction and topological electronic states.</p>

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Fermi surface reconstruction and anisotropic linear magnetoresistance in the charge density wave topological semimetal TaTe4

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月20日

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  • D. Silvera-Vega,
  • J. Rojas-Castillo,
  • E. Herrera-Vasco,
  • S. Chikara,
  • E. Ramos-Rodríguez,
  • W. J. Herrera,
  • A. F. Santander-Syro,
  • J. A. Galvis,
  • B. Uribe,
  • R. González-Hernández,
  • A. C. García-Castro,
  • P. Giraldo-Gallo

摘要

Understanding the interplay between topology and correlated electron states is central to the study of quantum materials. TaTe4 is a quasi-one-dimensional charge density wave (CDW) compound predicted to host topological phases, making it a model platform to explore this interplay. Here, we combine high-field magnetotransport measurements with density functional theory calculations to provide a comprehensive mapping of the Fermi surface (FS) of TaTe4 in its CDW phase. Using multiple current-field geometries, we resolve the four largest of six pockets of the FS predicted by theory and find no evidence of non-CDW bands, highlighting the full reconstruction of the FS in the bulk. We identify a previously unobserved quasi-cylindrical pocket and uncover a large size orbit consistent with magnetic breakdown between reconstructed FS sheets, from which we estimate a CDW gap of  ~ 0.29 eV. Moreover, we observe a robust linear magnetoresistance that persists across all field directions when current flows perpendicular to the 1D chains along which the CDW is formed, with a distinct high-field linear regime emerging when field is along the chains. These findings establish TaTe4 as a prototypical material to study the coexistence of correlation-driven reconstruction and topological electronic states.