School of Physics and Electronics, Shandong Normal University, Jinan 250358, People's Republic of China.
Shandong Provincial Engineering and Technical Center of Light Manipulations & Institute of Materials and Clean Energy, Shandong Normal University, Jinan 250358, People's Republic of China.
J Phys Condens Matter. 2023 Feb 15;35(14). doi: 10.1088/1361-648X/acb582.
Prediction and synthesis of two-dimensional high transition temperature () superconductors is an area of extensive research. Based on calculations of the electronic structures and lattice dynamics, we predict that graphene-like layered monolayer LiCis a-electrons mediated Bardeen-Cooper-Schrieffer-type superconductor. Monolayer LiCis theoretically stable and expected to be synthesized experimentally. From the band structures and the phonon dispersion spectrum, it is found that the saddle point of-bonding bands induces large density of states at the Fermi energy level. There is strongly coupled between the vibration mode in the in-plane direction of the lithium atoms and the-electrons of carbon atoms, which induces the high-superconductivity in LiC. Thecan reach to 41 K under an applied 10% biaxial tensile strain based on the anisotropic Eliashberg equation. Our results show that monolayer LiCis a good candidate as-electrons mediated electron-phonon coupling high-superconductor.
二维高温（）超导体的预测和合成是一个广泛研究的领域。基于电子结构和晶格动力学的计算，我们预测类石墨烯层状单层 LiC 是由 a 电子介导的 Bardeen-Cooper-Schrieffer 型超导体。单层 LiC 在理论上是稳定的，预计可以通过实验合成。从能带结构和声子色散谱中发现，键的鞍点诱导费米能级处的态密度很大。锂原子平面方向的振动模式与碳原子的电子之间存在强烈的耦合，这导致了 LiC 的高超导性。根据各向异性的 Eliashberg 方程，在施加 10%双轴拉伸应变的情况下，超导转变温度可以达到 41 K。我们的结果表明，单层 LiC 是一种很好的候选材料，因为它由 a 电子介导的电子-声子耦合具有高超导性。
