Electronic structure of a borophene layer in rare-earth aluminum/chromium boride and its hydrogenated derivative borophane,Physical Review Materials

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Electronic structure of a borophene layer in rare-earth aluminum/chromium boride and its hydrogenated derivative borophane
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-08-23 , DOI: 10.1103/physrevmaterials.5.084007
Masahito Niibe _{1,

2} , Mathis Cameau _{2,

3,

4} , Nguyen Thanh Cuong ₅ , Omeji Ilemona Sunday _{2,

6} , Xiaoni Zhang ₂ , Yuki Tsujikawa ₂ , Susumu Okada ₅ , Kunio Yubuta ₇ , Takahiro Kondo ₅ , Iwao Matsuda ₂

Affiliation

We studied electronic states of borophene in a crystal of rare-earth aluminum/chromium boride and the hydrogenated sheet, borophane, successfully prepared by ion exchange and liquid exfoliation of the crystal. The layer has a boron network with five-membered and seven-membered rings. Electronic structures of all the boron-derived layers are found to be gapless by soft x-ray absorption and emission spectroscopy measurements at the B K-shell absorption edge and density functional theory calculations. The present results support the existence of a Dirac nodal loop at the Fermi level in the borophane layer with five- and seven-membered rings, predicted recently by topological calculations.

中文翻译：

稀土铝/铬硼化物及其氢化衍生物硼烷中硼烯层的电子结构

我们研究了稀土铝/硼化铬晶体中硼烷的电子态，以及通过晶体的离子交换和液体剥离成功制备的氢化片材硼烷。该层具有带五元环和七元环的硼网络。通过软 X 射线吸收和发射光谱测量在 B K壳吸收边缘和密度泛函理论计算，发现所有硼衍生层的电子结构都是无间隙的。目前的结果支持最近通过拓扑计算预测的具有五元和七元环的硼烷层中费米能级狄拉克节点环的存在。

更新日期：2021-08-23

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