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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; Li, Jiangxu; Wang, Lei; Liu, Jiaxi; Ma, Hui; Song, Hai-Feng; Li, Dianzhong; Li, Yyi; Chen, Xing-Qiu
2019-09-23
Source PublicationPHYSICAL REVIEW LETTERS
ISSN0031-9007
Volume123Issue:13
AbstractBeryllium 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.
Indexed BySCI
Language英语
WOS IDWOS:000487744600009
PublisherAMER PHYSICAL SOC
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80761
Collection中国科学院金属研究所
Recommended Citation
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).
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).
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).
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