arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1003.0407cond-mat.supr-con
收藏

非中心对称超导体中响应和输运的动力学理论

Kinetic theory for response and transport in non-centrosymmetric superconductors

Ludwig Klam, Dirk Manske, Dietrich Einzel

摘要:

我们建立了清洁极限低温下非中心对称超导体的动力学理论。输运方程求解相当普遍的自旋和粒子-空穴(Nambu)空间进行第一个带基和第二个Bogoliubov变换的准粒子-准空穴相空间的变换。我们的结果是一个粒子-空穴对称、规范不变和电荷守恒的描述,在整个准经典区域都是有效的。我们计算了电流响应,比热容,和拉曼响应函数。对于拉曼的情况下,我们调查在这个框架内的电子(对断裂)拉曼响应最近发现的非中心对称超导体在零温度下的偏振依赖性。可能的应用包括CePt $_3$ Si和Li $_2$ Pd $_x$ Pt $_{3-x}$ B系统,它们反映了两类重要的自旋-轨道耦合。我们提供了这两个类的拉曼顶点的解析表达式,并计算了电子光谱的偏振依赖性。我们预测一个双峰结构和不同的幂律相对于未知的相对大小的单重态和三重态贡献的超导序参量,揭示了大量的各种各样的特征指纹的底层冷凝物。

英文摘要:

We formulate a kinetic theory for non-centrosymmetric superconductors at low temperatures in the clean limit. The transport equations are solved quite generally in spin- and particle-hole (Nambu) space by performing first a transformation into the band basis and second a Bogoliubov transformation to the quasiparticle-quasihole phase space. Our result is a particle-hole-symmetric, gauge-invariant and charge conserving description, which is valid in the whole quasiclassical regime. We calculate the current response, the specific heat capacity, and the Raman response function. For the Raman case, we investigate within this framework the polarization-dependence of the electronic (pair-breaking) Raman response for the recently discovered non-centrosymmetric superconductors at zero temperature. Possible applications include the systems CePt$_3$Si and Li$_2$Pd$_x$Pt$_{3-x}$B, which reflect the two important classes of the involved spin-orbit coupling. We provide analytical expressions for the Raman vertices for these two classes and calculate the polarization-dependence of the electronic spectra. We predict a two-peak structure and different power laws with respect to the unknown relative magnitude of the singlet and triplet contributions to the superconducting order parameter, revealing a large variety of characteristic fingerprints of the underlying condensate.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑