物理
Dirac(视频压缩格式)
凝聚态物理
石墨烯
单层
迪拉克费米子
对称(几何)
拓扑绝缘体
量子力学
作者
Daiyu Geng,Kejun Yu,Shaosheng Yue,Jin Cao,Wenbin Li,Da-Shuai Ma,Chaoxi Cui,Masashi Arita,Shiv Kumar,Eike F. Schwier,Kenya Shimada,Peng Cheng,Lan Chen,Kehui Wu,Yugui Yao,Baojie Feng
出处
期刊:Physical Review B
[American Physical Society]
日期:2020-04-22
卷期号:101 (16): 161407-
被引量:4
标识
DOI:10.1103/physrevb.101.161407
摘要
Monolayer ${\mathrm{AlB}}_{2}$ is composed of two atomic layers: honeycomb borophene and triangular aluminum. In contrast with the bulk phase, monolayer ${\mathrm{AlB}}_{2}$ is predicted to be a superconductor with a high critical temperature. Here, we demonstrate that monolayer ${\mathrm{AlB}}_{2}$ can be synthesized on Al(111) via molecular beam epitaxy. Our theoretical calculations revealed that the monolayer ${\mathrm{AlB}}_{2}$ hosts several Dirac cones along the $\mathrm{\ensuremath{\Gamma}}\text{\ensuremath{-}}M$ and $\mathrm{\ensuremath{\Gamma}}\text{\ensuremath{-}}K$ directions; these Dirac cones are protected by crystal symmetries and are thus resistant to external perturbations. The extraordinary electronic structure of the monolayer ${\mathrm{AlB}}_{2}$ 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.
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