Investigation of electronic properties of novel two-dimensional materials

新型二维材料的电子特性研究

基本信息

批准号：
18K14191
负责人：
FENG BAOJIE
金额：
$ 2.66万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Early-Career Scientists
财政年份：
2018
资助国家：
日本
起止时间：
2018-04-01 至 2019-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-18K14191/
关键词：
two-dimensional material ARPES molecular beam epitaxy band structure theoretical calculation 2D materials STM electronic structure Synchrotron Radiation

项目摘要

We mainly investigated three different materials: monolayer blue phosphene, monolayer GdAg2 and single crystal LaBi.Monolayer blue phosphene is grown by evaporating pieces of black phosphene onto a clean Au(111) substrate. From the LEED pattern, we find a perfect 5x5 superstructure, which is in good agreement with previous reports. The ARPES measurements have confirmed the existence of a band gap near the Fermi level. So blue phosphene is a good candidate for future nanodevices. The manuscript is still under preparation.Monolayer GdAg2 is grown by evaporating pure Gd from a e-beam evaporator onto a clean Ag(111) substrate. Previous MOKE and XMCD measurements have confirmed the ferromagnetic order in this material. Here, using ARPES, we found the existence of a Weyl nodal line in this material. Our theoretical collaborator confirmed our findings. Now, the manuscript has been submitted and is under review.LaBi is a topological insulator candidate. Previous experiments have reported some ARPES results on the band structures and concluded that LaBi have topological Dirac cones. However, here we studied the surface states of LaBi by high-resolution ARPES and first-principles calculations. We found that the otherwise topological nontrivial surface states are gapped out by band hybridization and the surface states looks like a Dirac nodal line. This work has already been published in Physical Review B. [Phys. Rev. B 97, 155153 (2018)]

我们主要研究了三种不同的材料：单层蓝色磷酸，单层GDAG2和单晶阴性。单层蓝磷酸是通过将黑磷酸蒸发到干净的Au（111）底物上生长的。从LEED模式来看，我们找到了一个完美的5x5上层建筑，这与以前的报告非常吻合。 ARPES的测量已证实在费米水平附近存在带隙。因此，蓝色磷烯是未来纳米版的良好候选者。手稿仍在准备中。单层GDAG2是通过将纯GD从电子束蒸发器蒸发到干净的Ag（111）底物而生长的。先前的摩克和XMCD测量已确认该材料中的铁磁顺序。在这里，使用ARPE，我们发现该材料中存在Weyl节点线。我们的理论合作者证实了我们的发现。现在，手稿已提交并正在审查中。Labi是拓扑绝缘子候选人。先前的实验报告了一些ARPES在带结构上的结果，并得出结论，Labi具有拓扑狄拉克锥。但是，在这里，我们通过高分辨率ARPE和第一原理计算研究了Labi的表面状态。我们发现，原本拓扑的非平凡表面状态被带杂交所掩盖，表面状态看起来像是狄拉克节点线。这项工作已经发表在《物理评论》中。[物理学。 Rev. B 97，155153（2018）]