论文标题
迈向有效的质量模型，用于二吡啶镁镁超导纳米结构
Towards an effective mass model for the quasi-1D magnesium diboride superconducting nanostructures
论文作者
论文摘要
我们开发了一个抛物线有效的质量模型，目的是描述几个单层MGB $ _2 $中的平面内收缩超导性。该模型被用来研究限制的准$ 1 $ D超晶格，并使用最简单的Anderson近似版本。在$ e_f $上连续的正常状态色散切割与准二氧化碳分散体的小班上切割的小匹配之间，发现了谐振的Fano-feshbach样效应，即使后者与费米水平有显着距离。由于特定的材料参数，该现象的起源被认为是特征性局部特征状态的存在。此外，当耦合的强度仍然不足以打开超导间隙，但足以将电子孔混合引入系统时，描述了在具有非零相差的系统中导致“前体”伪群区域的机制。
We developed a parabolic effective mass model with the aim to describe the in-plane constricted superconductivity in few-monolayer MgB$_2$. The model was employed to study a constricted quasi-$1$D superlattice with the simplest version of the Anderson approximation. Resonant Fano-Feshbach-like effect was found, between a miniband of a continuous normal state dispersion cutting across $E_F$ and a miniband of quasi-discrete dispersion, even though the latter is significantly energetically distanced from the Fermi level. The origin of the phenomenon was identified to be the presence of characteristic strongly localised eigenstates, due to the specific material parameters. Moreover, the mechanism leading to a "precursor" pseudogap region in a system with a non-zero phase difference is described, when the strength of the coupling is still not sufficient to open a superconducting gap, but enough to introduce electron-hole mixing into the system.
