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arXiv 2006.02512cond-mat.supr-con
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多带超导体中的奇异带间配对

Exotic interband pairing in multiband superconductors

K. V. Samokhin

摘要:

与通常的假设相反,自旋轨道耦合晶体中的电子布洛赫态并不总是以与纯自旋1/2态相同的方式在对称操作下变换。这对超导体的对称性和节点结构,特别是带隙函数有着深远的影响。专注于四极超导体,我们表明,在传统的(s波)通道的带间配对可以具有传统上与非常规配对,如三重态成分和奇宇称,并可以产生线节点的激发能间隙的功能。在d波的情况下,带间配对,也可以是奇数的动量,并有一个三重态分量,改变了节点线的位置和拓扑结构。

英文摘要:

Contrary to the usual assumption, the electron Bloch states in crystals with spin-orbit coupling do not always transform under symmetry operations in the same way as the pure spin-1/2 states. This has profound consequences for the symmetry properties and nodal structure of superconductors, especially for the interband gap functions. Focusing on tetragonal superconductors, we show that the interband pairing in the conventional (s-wave) channel can have features which are traditionally associated with unconventional pairing, such as triplet components and odd parity, and can produce line nodes in the excitation energy gap. In the d-wave case, the interband pairing, which can also be odd in momentum and have a triplet component, changes the positions and topology of the nodal lines.

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