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arXiv 1107.1845cond-mat.supr-concond-mat.mtrl-scicond-mat.other
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石墨烯层间插层中二维超导电性的理论研究

Theoretical Investigation of Two-Dimensional Superconductivity in Intercalated Graphene Layers

R. A. Jishi, D. M. Guzman, H. M. Alyahyaei

摘要:

利用第一性原理计算,对碱土金属原子嵌入石墨烯双层和三层体系的电子结构和振动模式进行了计算.研究发现,与超导石墨层间化合物的情况相似,费米能级被来自层间态的S带和石墨π带穿过。发现钙插层石墨烯双层和三层中的电子-声子耦合参数分别为0.60和0.80。在超导CaC_6石墨层间化合物中,电子-声子耦合参数的计算值为0.83。得出的结论是,二维超导电性是可能的,在一个系统中的几个石墨烯层插入钙。

英文摘要:

First-principles calculations of the electronic structure and vibrational modes, in a system of graphene bilayers and trilayers intercalated with alkaline earth atoms, are resented. It is found that, in similarity to the case of superconducting graphite intercalation compounds, the Fermi level is crossed by an s-band derived from the intercalant states, as well as graphitic pi-bands. The electron-phonon coupling parameter is found to be 0.60 and 0.80, respectively, in calcium intercalated graphene bilayers and trilayers. In superconducting CaC6 graphite intercalation compound, the calculated value for the electron-phonon coupling parameter is 0.83. It is concluded that two-dimensional superconductivity is possible in a system of a few graphene layers intercalated with calcium.

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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