![]() Recent years have beheld the emergence of transition metal dichalcogenides (TMDCs) as a rich class of quasi-two-dimensional materials with electronic properties spanning from trivial semiconductors and semimetals to superconductors and topological phases 1, 2, 3. Our results not only provide further impetus for studying emergent phenomena in NiTe 2 but also underscore the limitations of fabricating NiTe 2 films for device applications. Comparisons of experimental to first-principles results also highlight difficulties in fabricating atomically smooth single-layer NiTe 2 films. As the film thickness increases from one to five layers, the gap in the conical topological surface states closes. By conducting experimental band mappings of ultrathin films prepared with molecular beam epitaxy, we reveal spectroscopic evidence for the dimensionality crossover of single-crystalline ultrathin NiTe 2 films as a function of film thickness. Realizing such intriguing phenomena requires the fabrication of ultrathin NiTe 2 films and an understanding of the underlying physics that is still under debate. Nickel ditelluride (NiTe 2), a recently discovered Type-II Dirac semimetal with topological Dirac fermions near the Fermi energy, is expected to exhibit strong thickness-mediated electronic tunability and intrinsic two-gap superconductivity in the single-layer limit. ![]()
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