论文标题
来自pd $ _ {3} $ bi $ _ {2} $ se $ _ {2} $的二维Dirac Fermions的异常磁转运
Unusual Magnetotransport from two dimensional Dirac Fermions in Pd$_{3}$Bi$_{2}$Se$_{2}$
论文作者
论文摘要
PD $ _ {3} $ bi $ _ {2} $ SE $ _ {2} $已被提议本质上是拓扑性的。但是，仍然没有探索其非平凡行为的证据。我们报告了PD $ _ {3} $ bi $ _ {2} $ se $ _ {2} $薄膜的增长和磁传输研究，这首先揭示了二维（2D）拓扑表面状态的贡献。我们观察到异常的非饱和线性磁磁性，这是由于居住在量子极限中的最低兰道水平的狄拉克·费米（Dirac Fermions）所产生的。横向磁路线从半古典弱场$ b^{2} $依赖性转变为关键字段的高场$ b $依赖关系$ b^{\ star} $。发现$ b^{\ star} \ propto t^2 $，这可以从线性能量分散的Landau级分裂。另外，磁导率显示了2D弱抗本地化（WAL）的特征。这些新颖的磁转运签名证明了Pd $ _ {3} $ bi $ $ _ {2} $ se $ _ {2} $薄膜中2D Dirac Fermions的存在。
Pd$_{3}$Bi$_{2}$Se$_{2}$ 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 Pd$_{3}$Bi$_{2}$Se$_{2}$ 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 Pd$_{3}$Bi$_{2}$Se$_{2}$ thin films.
