Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface
文献类型：期刊论文
| 作者 | Li, Ronghan2,3; Li, Jiangxu2,3; Wang, Lei2,3; Liu, Jiaxi2,3; Ma, Hui2; Song, Hai-Feng1; Li, Dianzhong2,3; Li, Yyi2,3; Chen, Xing-Qiu2,3 |
| 刊名 | PHYSICAL REVIEW LETTERS
 |
| 出版日期 | 2019-09-23 |
| 卷号 | 123期号:13页码:7 |
| ISSN号 | 0031-9007 |
| DOI | 10.1103/PhysRevLett.123.136802 |
| 通讯作者 | Chen, Xing-Qiu(xingqiu.chen@imr.ac.cn) |
| 英文摘要 | Beryllium has recently been discovered to harbor a Dirac nodal line (DNL) in its bulk phase and the DNL-induced nontrivial surface states (DNSSs) on its (0001) surface, rationalizing several already-existing historic puzzles [Phys. Rev. Lett. 117, 096401 (2016)]. However, to date the underlying mechanism as to why its (0001) surface exhibits an anomalously large electron-phonon coupling effect (lambda(s)(e-ph) approximate to 1.0) remains unresolved. Here, by means of first-principles calculations, we show that the coupling of the DNSSs with the phononic states mainly contributes to its novel surface e-ph enhancement. Besides the fact that the experimentally observed lambda(s)(e-ph) and the main Eliashberg coupling function (ECF) peaks are reproduced well in our current calculations, we decompose the ECF alpha F-2(k, q; v) and the e-ph coupling strength lambda(k, q; v) as a function of each electron momentum (k), each phonon momentum (q), and each phonon mode (v), evidencing the robust connection between the DNSSs and both alpha F-2(k, q; v) and lambda(k, q; v). The results reveal the strong e-ph coupling between the DNSSs and the phonon modes, which contributes over 80% of the lambda(s)(e-ph) coefficient on the Be (0001) surface. It highlights that the anomalously large e-ph coefficient on the Be (0001) surface can be attributed to the presence of its DNL-induced DNSSs, clarifying the long-debated mechanism. |
| 资助项目 | National Science Fund for Distinguished Young Scholars[51725103] ; National Natural Science Foundation of China[51671193] ; National Natural Science Foundation of China[51474202] ; Science Challenging Project[TZ2016004] |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000487744600009 |
| 出版者 | AMER PHYSICAL SOC |
| 资助机构 | National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; Science Challenging Project |
| 源URL | [http://ir.imr.ac.cn/handle/321006/135444]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Chen, Xing-Qiu |
| 作者单位 | 1.Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ronghan,Li, Jiangxu,Wang, Lei,et al. Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface[J]. PHYSICAL REVIEW LETTERS,2019,123(13):7. |
| APA | Li, Ronghan.,Li, Jiangxu.,Wang, Lei.,Liu, Jiaxi.,Ma, Hui.,...&Chen, Xing-Qiu.(2019).Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface.PHYSICAL REVIEW LETTERS,123(13),7. |
| MLA | Li, Ronghan,et al."Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface".PHYSICAL REVIEW LETTERS 123.13(2019):7. |
入库方式： OAI收割
来源：金属研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。