准二维电子氮化物Y $_2$ C中由层间电子产生的半金属“电子带”
Semimetallic "Electride Bands" Derived from Interlayer Electrons in Quasi-Two-Dimensional Electride Y$_2$C
摘要：
二维纳米材料是一种新概念材料，其阴离子电子被限制在带正电荷的层间空间中。为了验证Y $_2$ C中二维电子态的形成，我们对可能的二维电子态Y $_2$ C进行了角分辨光电子能谱测量。我们清楚地观察到费米能级附近的半金属“Borde带”的存在，正如${ab}$ ${initio}$计算所预测的那样，最终证明Y $_2$ C是一个准二维Borde，Borde带来自层间阴离子电子。
英文摘要：
Two-dimensional (2D) electrides are a new concept material in which anionic electrons are confined in the interlayer space between positively charged layers. We have performed angle-resolved photoemission spectroscopy measurements on Y$_2$C, which is a possible 2D electride, in order to verify the formation of 2D electride states in Y$_2$C. We clearly observe the existence of semimetallic "electride bands" near the Fermi level, as predicted by ${ab}$ ${initio}$ calculations, conclusively demonstrating that Y$_2$C is a quasi-2D electride with electride bands derived from interlayer anionic electrons.
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