论文标题

来自pomeranchuk和库珀的不稳定性引起的电子多物和多重对,bogoliubov费米表面

Electronic multipoles and multiplet pairs induced from Pomeranchuk and Cooper instabilities of Bogoliubov Fermi surfaces

论文作者

Tamura, Shun-Ta, Iimura, Shoma, Hoshino, Shintaro

论文摘要

最近有人指出,即使在对称的自旋轨道相互作用和破裂的时间反转对称性下,费米表面也可以保留在超导体中。使用线性响应理论,我们研究了这种系统对排序的不稳定性,这是费米表面的内在特性。有序状态分类为对角线和偏高的状态,每个状态分别表明pomeranchuk的不稳定性和库珀配对不是原始电子,而是Bogoliubov颗粒(Bogolons)。相应的顺序参数是通过原始电子的多极矩(对角顺序参数)和多重对振幅(OffDiaGonal阶参数)扩展的,这些振幅是由Bogolons订单引起的内部字段引起的。虽然Bogolons的顺序参数部分继承了原始电子的字符,但许多顺序参数组件与相似的大小混合。因此,在原始电子方面,相变是对角线还是偏角订购,没有明确的区别。超导状态内的这些有序不稳定性为超导体提供了洞察力,这些导体的第二相跃迁低于第一个过渡温度。

It has recently been pointed out that Fermi surfaces can remain even in the superconductors under the symmetric spin-orbit interaction and broken time-reversal symmetry. Using the linear response theory, we study the instability of such systems toward ordering, which is an intrinsic property of the Fermi surfaces. The ordered states are classified into diagonal and offdiagonal ones, each of which respectively indicates the Pomeranchuk instability and Cooper pairing not of original electron but of Bogoliubov particles (bogolons). The corresponding order parameters are expanded by multipole moments (diagonal order parameter) and multiplet pair amplitudes (offdiagonal order parameter) of original electrons, which are induced by the internal fields arising from bogolons' ordering. While the bogolons' order parameters partially inherit the characters of the original electrons, many order parameter components mix with similar magnitude. Hence there is no clear-cut distinction whether the phase transition is diagonal or offdiagonal ordering in terms of the original electrons. These ordering instabilities inside the superconducting states provide insights into the superconductors which have the second phase transition below the first transition temperature.

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