论文标题
单层ALB $ _2 $的实验证据，具有对称性保护的狄拉克锥
Experimental evidence of monolayer AlB$_2$ with symmetry-protected Dirac cones
论文作者
论文摘要
单层Alb $ _2 $由两个原子层组成：蜂窝硼苯和三角铝。与散装相相反，单层ALB $ _2 $预计将是高临界温度的超导体。在这里，我们证明单层ALB $ _2 $可以通过分子束外延在AL（111）上合成。我们的理论计算表明，单层Alb $ _2 $沿$γ$ - m和$γ$ - k方向托管几个狄拉克锥体；这些狄拉克锥由晶体对称性保护，因此对外部扰动有抵抗力。单层ALB $ _2 $的非凡电子结构通过角度分辨光发射光谱测量确认。这些结果可能会刺激进一步的研究兴趣，以探索二维材料中狄拉克·费米斯（Dirac Fermions）和超导性的相互作用引起的外来特性。
Monolayer AlB$_2$ is composed of two atomic layers: honeycomb borophene and triangular aluminum. In contrast with the bulk phase, monolayer AlB$_2$ is predicted to be a superconductor with a high critical temperature. Here, we demonstrate that monolayer AlB$_2$ can be synthesized on Al(111) via molecular beam epitaxy. Our theoretical calculations revealed that the monolayer AlB$_2$ hosts several Dirac cones along the $Γ$--M and $Γ$--K directions; these Dirac cones are protected by crystal symmetries and are thus resistant to external perturbations. The extraordinary electronic structure of the monolayer AlB$_2$ was confirmed via angle-resolved photoemission spectroscopy measurements. These results are likely to stimulate further research interest to explore the exotic properties arising from the interplay of Dirac fermions and superconductivity in two-dimensional materials.
