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arXiv 2403.03036cond-mat.supr-con
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Ca插层双层硅烯中的超导电性

Superconductivity in Ca-intercalated bilayer silicene

Jisvin Sam, Sasmita Mohakud, Katsunori Wakabayashi, Sudipta Dutta

AI总结:

通过第一性原理计算揭示Ca插层双层硅烯Si2CaSi2中费米面与面外振动耦合导致的强电子—声子作用,预测其在5.4 K以下超导。

摘要:

在第一性原理计算中,我们研究了Ca插层双层硅烯化合物Si2CaSi2中的超导电性。这种超导性源于由Ca-3d与Si-3pz轨道杂化形成的层间花状、以Γ为中心的费米面,与硅烯屈曲结构所带来的低能面外振动之间的耦合。由此产生的强电子—声子耦合(可由Eliashberg谱函数明显看出)使这一二维共价体系在5.4 K以下出现超导。结果揭示了在实验可合成、具有多种应用前景的硅基薄膜材料中实现超导的关键调控参数。

英文摘要:

Within first-principles calculations, we explore superconductivity in Ca-intercalated bilayer silicene compound, Si2CaSi2. This arises from the coupling of interlayer flower-like Γ-centered Fermi surface formed by the hybridization of Ca-3d and Si-3pz orbitals with low-energy out-of-plane vibrations enabled by silicene's buckling. The consequent large electron-phonon coupling, as evident from the Eliashberg spectral function leads to superconductivity below 5.4 K in this two-dimensional covalent system. Our results reveal the key control parameters to achieve superconductivity in experimentally synthesizable silicon-based thin materials that can find diverse applications.

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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