Dirac Fermions, Nontrivial Surface States, And Quantum Transport In The Layered Telluride NbNiTe 2

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ABSTRACT Ternary tellurides offer a rich platform for exploring exotic transport phenomena in low‐dimensional quantum materials. Here, we report the observation of Dirac fermions, nontrivial surface states, and weak antilocalization in the layered telluride . First‐principles calculations, complemented by angle‐resolved photoemission spectroscopy (ARPES) measurements, reveal a series of robust Dirac points and nontrivial topological surface states near the Fermi level. The direct observation of linear band dispersions and surface‐originated features provides clear evidence for its Dirac semimetallic nature. Transport measurements show a metallic behavior with a low‐temperature resistivity upturn below 11.8 K, attributed to the combined effect of electron‐electron interaction and weak antilocalization. The latter is further evidenced by a dip‐like feature in the low‐field magnetoresistance and the agreement with the Hikami–Larkin–Nagaoka quantum correction model. Hall measurements indicate dominant hole‐type conduction. The resistivity upturn is enhanced under magnetic field or hydrostatic pressure, revealing tunable quantum transport. These findings suggest that is a promising material for exploring correlated topological phases and pressure‐tunable quantum transport.

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