Physica E: Low-dimensional Systems and Nanostructures ( IF 3.3 ) Pub Date : 2022-08-15 , DOI: 10.1016/j.physe.2022.115457 Shama, Dinesh Dixit, Goutam Sheet, Yogesh Singh
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 dependence to a high-field dependence at a critical field . It is found that , 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.
中文翻译:
Pd3Bi2Se2 中二维狄拉克费米子的异常磁输运
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对高场的依赖关键领域的依赖. 发现,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。