Mapping of the Fermi Surface of TaTe4 with magnetotransport measurements: Topological signatures and CDW

"The study of the interplay between highly correlated states, such as superconductivity or density waves and topological states, has become an increasingly active research field in the context of quantum materials due to the emergence of novel quasi-particles. Topological materials are known to support highly degenerated bands, including nodal points of various types such as Weyl, Dirac and double Dirac points. At these nodal points, new states and phenomena emerge when they interact with other correlated states. Transition metal tetrachalcogenides (TMTs) are promising in this context due to the predicted coexistence of complex predicted band structures with multiple band crossings and charge density waves (CDWs). In this study, we present a detailed band structure analysis of TaTe4 using high-quality magnetoresistance measurements. We provide insights into features not addressed in previous works. We report magnetoresistance data for TaTe4 with magnetic fields tilted in two perpendicular planes up to 35 T, offering a clear image of the Fermi level orbits and the material's topological character. We demonstrate that all predicted bands arising from the CDW phase can be identified and present a novel analysis of the Berry phase of the dominant pockets of the TaTe4 FS.

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