论文标题
Migdal-EliAshberg多波段高温超导性的理论在现场效应的氢化（111）钻石中
Migdal-Eliashberg theory of multi-band high-temperature superconductivity in field-effect-doped hydrogenated (111) diamond
论文作者
论文摘要
我们使用从密度功能理论（DFT）模拟中删除的参数进行单频和多波段Migdal-EliAshberg（ME）计算，以研究氢化（111）钻石表面的电场诱导的二维孔气中的超导性。我们表明，根据Eliashberg理论，当系统具有现场效应为$ 6 \ times10^{14} \，$ CM $ $ cm $^{ - 2} $时，可能会引起高t $ _ {\ text {c}} $超导阶段。从频带分辨的电子光谱函数$α^2f_ {jj'}（ω）$从头算起，我们在单个频段和多频级的状态下，迭代地求解了自偏的各向同性Migdal-Eliashberg方程，在单个频段和多频段的状态下，在fermi的近似状态下，在fermi的近似范围内。在单带公式中，我们发现t $ _ {\ text {c}} \ oft40 \，$ k，当考虑到系统的多波段性质时，它将在$ 4 \％$和$ 8 \％$之间增强。我们还计算了状态的多频敏感性准颗粒密度，以作为未来实验工作的指南。
We perform single- and multi-band Migdal-Eliashberg (ME) calculations with parameters exctracted from density functional theory (DFT) simulations to study superconductivity in the electric-field-induced 2-dimensional hole gas at the hydrogenated (111) diamond surface. We show that according to the Eliashberg theory it is possible to induce a high-T$_{\text{c}}$ superconducting phase when the system is field-effect doped to a surface hole concentration of $6\times10^{14}\,$cm$^{-2}$, where the Fermi level crosses three valence bands. Starting from the band-resolved electron-phonon spectral functions $α^2F_{jj'}(ω)$ computed ab initio, we iteratively solve the self-consistent isotropic Migdal-Eliashberg equations, in both the single-band and the multi-band formulations, in the approximation of a constant density of states at the Fermi level. In the single-band formulation, we find T$_{\text{c}}\approx40\,$K, which is enhanced between $4\%$ and $8\%$ when the multi-band nature of the system is taken into account. We also compute the multi-band-sensistive quasiparticle density of states to act as a guideline for future experimental works.
