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arXiv 1601.06111cond-mat.supr-con
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超导钙插层双层石墨烯中的电子-声子相互作用和配对机制

Electron-phonon interaction and pairing mechanism in superconducting Ca-intercalated bilayer graphene

E. R. Margine, Henry Lambert, Feliciano Giustino

摘要:

采用包含库仑相互作用的{ \it ab initio}各向异性Eliashberg理论,研究了钙插层石墨烯中的电子-声子相互作用和配对机制.我们发现C $_6$ CaC $_6$能支持声子介导的超导电性,其临界温度为$T_{\rm c}=$ 6.8-8.1 K,与实验数据符合得很好.我们的计算表明,低能量的钙$_{xy}$振动是至关重要的配对,它应该是可能的,以解决两个不同的超导间隙的电子和空穴费米表面口袋。

英文摘要:

Using the {\it ab initio} anisotropic Eliashberg theory including Coulomb interactions, we investigate the electron-phonon interaction and the pairing mechanism in the recently-reported superconducting Ca-intercalated bilayer graphene. We find that C$_6$CaC$_6$ can support phonon-mediated superconductivity with a critical temperature $T_{\rm c}=$6.8-8.1~K, in good agreement with experimental data. Our calculations indicate that the low-energy Ca$_{xy}$ vibrations are critical to the pairing, and that it should be possible to resolve two distinct superconducting gaps on the electron and hole Fermi surface pockets.

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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