Within first-principles calculations, we explore superconductivity in Ca-intercalated bilayer silicene compound, Si2CaSi2. This arises from the coupling of interlayer flower-like \Gamma-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.
@article{arxiv.2403.03036,
title = {Superconductivity in Ca-intercalated bilayer silicene},
author = {Jisvin Sam and Sasmita Mohakud and Katsunori Wakabayashi and Sudipta Dutta},
journal= {arXiv preprint arXiv:2403.03036},
year = {2024}
}