Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface

doi:10.1103/PhysRevLett.123.136802

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	Underlying Topological Dirac Nodal Line Mechanism of the Anomalously Large Electron-Phonon Coupling Strength on a Be (0001) Surface
	Li, Ronghan 1,2; Li, Jiangxu 1,2; Wang, Lei 1,2; Liu, Jiaxi 1,2; Ma, Hui 1; Song, Hai-Feng 3; Li, Dianzhong 1,2; Li, Yyi 1,2; Chen, Xing-Qiu 1,2
通讯作者	Chen, Xing-Qiu(xingqiu.chen@imr.ac.cn)
	2019-09-23
发表期刊	PHYSICAL REVIEW LETTERS
ISSN	0031-9007
卷号	123 期号:13 页码:7
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.
资助者	National Science Fund for Distinguished Young Scholars ; National Natural Science Foundation of China ; Science Challenging Project
DOI	10.1103/PhysRevLett.123.136802
收录类别	SCI
语种	英语
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
WOS类目	Physics, Multidisciplinary
WOS记录号	WOS:000487744600009
出版者	AMER PHYSICAL SOC
引用统计	被引频次：31[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/135445
专题	中国科学院金属研究所
通讯作者	Chen, Xing-Qiu
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China 3.Inst Appl Phys & Computat Math, Beijing 100094, 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.