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Layered three-dimensional (3D) topological semimetals have attractedintensively attention due to the exotic phenomena and abundantly tunableproperties. Here we report the experimental evidence for the 3D topologicalsemimetal phase in layered material TaNiTe5 single crystals through quantumoscillations. Strong quantum oscillations have been observed with diamagnetismbackground in TaNiTe5. By analyzing the de Haas-van Alphen oscillations,multi-periodic oscillations were extracted, in content with magnetotransportmeasurements. Moreover, nontrivial "{\pi}" Berry phase with 3D Fermi surface isidentified, indicating the topologically nontrivial feature in TaNiTe5.Additionally, we demonstrated the thin-layer of TaNiTe5 crystals is highlyfeasible by the mechanical exfoliation, which offers a platform to exploreexotic properties in low dimensional topological semimetal and paves the wayfor potential applications in nanodevices.

Three-dimensional topological semimetal phase in layered TaNiTe5 probed by de Haas-van Alphen effect