Pd₃Bi₂Se₂ has been proposed to be topologically non-trivial in nature. However, evidence of its non-trivial behavior is still unexplored. We report the growth and magneto-transport study of Pd₃Bi₂Se₂ thin films, revealing for the first time the contribution of two-dimensional (2D) topological surface states. We observe exceptional non-saturated linear magnetoresistance which results from Dirac fermions inhabiting the lowest Landau level in the quantum limit. The transverse magnetoresistance changes from a semi-classical weak-field $B^2$ dependence to a high-field $B$ dependence at a critical field $B^{\star }$. It is found that $B^{\star }\propto T^2$, which is expected from the Landau level splitting of a linear energy dispersion. In addition, the magnetoconductivity shows signatures of 2D weak anti-localization (WAL). These novel magnetotransport signatures evince the presence of 2D Dirac fermions in Pd₃Bi₂Se₂ thin films.

Pd ₃ Bi ₂ Se ₂已被提议在本质上是拓扑非平凡的。然而，其非平凡行为的证据仍未得到探索。_{我们报告了 Pd 3} Bi ₂ Se ₂薄膜的生长和磁输运研究，首次揭示了二维 (2D) 拓扑表面态的贡献。我们观察到异常的非饱和线性磁阻，这是由狄拉克费米子居住在量子极限中的最低朗道能级引起的。横向磁阻从半经典弱场变化${乙}^2$对高场的依赖$乙$关键领域的依赖${乙}^{\star }$. 发现${乙}^{\star }\propto {吨}^2$，这是由线性能量色散的朗道能级分裂所预期的。此外，磁导率显示出二维弱反定位（WAL）的特征。_{这些新颖的磁输运特征表明在 Pd 3} Bi ₂ Se ₂薄膜中存在二维狄拉克费米子。