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arXiv 0810.4159cond-mat.mtrl-scicond-mat.str-el
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外延石墨烯中的Kohn反常与电子-电子和电子-声子相互作用

Kohn anomaly and interplay of electron-electron and electron-phonon interactions in epitaxial graphene

S. Y. Zhou, D. A. Siegel, A. V. Fedorov, A. Lanzara

摘要:

通过直接探测石墨烯的电子结构,研究了外延石墨烯中电子-声子(el-ph)和电子-电子(el-el)相互作用。我们发现电子与A1 g声子的软部分的强耦合,在150+/-15 meV处出现扭结,而电子与另一个预期的声子E2 g的耦合在195 meV处只能勉强检测到。还讨论了el-el相互作用对电子与A1 g声子耦合增强的可能作用,以及el-ph相互作用对高结合能下自能线性虚部的贡献。我们的研究结果揭示了A1 g声子在石墨烯的el-ph相互作用中的主导作用,并强调了el-el和el-ph相互作用在石墨烯自能中的重要作用。

英文摘要:

The interplay of electron-phonon (el-ph) and electron-electron (el-el) interactions in epitaxial graphene is studied by directly probing its electronic structure. We found a strong coupling of electrons to the soft part of the A1g phonon evident by a kink at 150+/-15 meV, while the coupling of electrons to another expected phonon E2g at 195 meV can only be barely detected. The possible role of the el-el interaction to account for the enhanced coupling of electrons to the A1g phonon, and the contribution of el-ph interaction to the linear imaginary part of the self energy at high binding energy are also discussed. Our results reveal the dominant role of the A1g phonon in the el-ph interaction in graphene, and highlight the important interplay of el-el and el-ph interactions in the self energy of graphene.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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