Straintronic effect for superconductivity enhancement in Li-intercalated bilayer MoS2,Nanoscale Advances

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Straintronic effect for superconductivity enhancement in Li-intercalated bilayer MoS2
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-07-06 , DOI: 10.1039/d0na00420k
Poobodin Mano ₁ , Emi Minamitani ₂ , Satoshi Watanabe ₁

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In this study, ab initio calculations were performed to show that the superconductivity in Li-intercalated bilayer MoS₂ could be enhanced by applying either compressive or tensile strain. Moreover, the mechanism for superconductivity enhancement for the tensile strain case was found to be different than that of the compressive strain case. Enhanced electron phonon coupling (EPC) under tensile strain could be explained by an increase in the nesting function involved with the change in the Fermi surface topology in a wide range of Brillouin zones. The superconducting transition temperature T_c of 0.46 K at zero strain increased up to 9.12 K under a 6.0% tensile strain. Meanwhile, the enhancement in compressive strain was attributed to the increase in intrinsic electron phonon matrix elements. Furthermore, the contribution from interband scattering was large, which suggested the importance of electron pockets on the Fermi surface. Finally, 80% of the total EPC (λ = 0.98) originated from these pockets and the estimated T_c was 13.50 K.

中文翻译：

应变电子效应增强嵌锂双层 MoS2 的超导性

在这项研究中，从头计算表明，通过施加压缩应变或拉伸应变可以增强嵌锂双层 MoS ₂的超导性。此外，发现拉伸应变情况下的超导增强机制与压缩应变情况下的不同。拉伸应变下增强的电子声子耦合（EPC）可以通过与大范围布里渊区费米表面拓扑变化相关的嵌套函数的增加来解释。零应变下的超导转变温度T _c为 0.46 K，在 6.0% 拉伸应变下则升至 9.12 K。同时，压缩应变的增强归因于本征电子声子矩阵元素的增加。此外，带间散射的贡献很大，这表明费米表面上电子袋的重要性。最后，总 EPC ( λ = 0.98) 的 80% 来自这些口袋，估计的T _c为 13.50 K。

更新日期：2020-08-11

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