LaCuSb $_{2}$中的狄拉克费米子和可能的弱反定域
Dirac Fermions and Possible Weak Antilocalization in LaCuSb$_{2}$
摘要：
层状重金属正方晶格化合物由于其亚晶格内的成键作用而成为狄拉克费米子材料。我们报告的层状锑正方晶格材料LaCuSb $_{2}$的量子输运和光谱数据。线性色散带交叉，必要的狄拉克费米子，实验观察到的电子能带结构观察使用角分辨光电子能谱（ARPES），随着准二维费米面。弱反局域化，从二维运输中观察到的磁阻，以及线性依赖的区域，这两者都是拓扑非平凡的影响的指示。测量的Shubnikov-de Haas（SdH）量子振荡显示低有效质量的电子的数量级为0.065 $m_{e}$，进一步证实了狄拉克费米子在这种材料中的存在。
英文摘要：
Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb$_{2}$. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy (ARPES), along with a quasi-two-dimensional Fermi surface. Weak antilocalization that arises from two-dimensional transport is observed in the magnetoresistance, as well as regions of linear dependence, both of which are indicative of topologically non-trivial effects. Measurements of the Shubnikov-de Haas (SdH) quantum oscillations show low effective mass electrons on the order of 0.065$m_{e}$, further confirming the presence of Dirac fermions in this material.
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