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arXiv 1109.0885cond-mat.mtrl-scicond-mat.mes-hall
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多体GW方法研究C60富勒烯中的电子-声子耦合

Electron-phonon coupling in the C60 fullerene within the many-body GW approach

Carina Faber, Jonathan Laflamme Janssen, Michel Côté, E. Runge, X. Blase

摘要:

我们研究的电子-声子耦合的C60富勒烯内的第一性原理GW方法,专注于最低的未占用t1 u三重电子态,这是相关的电子掺杂富勒烯的超导转变。结果表明,耦合的强度显着增强相比,标准的密度泛函理论计算(半)本地泛函,与48%的电子-声子势VEP增加。计算的GW值的贡献从汞模式的93毫电子伏的最近的实验值的4%以内。目前的结果要求重新调查以前的密度泛函计算的电子-声子耦合在共价体系中的一般。

英文摘要:

We study the electron-phonon coupling in the C60 fullerene within the first-principles GW approach, focusing on the lowest unoccupied t1u three-fold electronic state which is relevant for the superconducting transition in electron doped fullerides. It is shown that the strength of the coupling is significantly enhanced as compared to standard density functional theory calculations with (semi)local functionals, with a 48% increase of the electron-phonon potential Vep. The calculated GW value for the contribution from the Hg modes of 93 meV comes within 4% of the most recent experimental values. The present results call for a reinvestigation of previous density functional based calculations of electron-phonon coupling in covalent systems in general.

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