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arXiv 1110.6000cond-mat.supr-con
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无局域反演对称性的超导性;多层体系

Superconductivity without Local Inversion Symmetry; Multi-layer Systems

Daisuke Maruyama, Manfred Sigrist, Youichi Yanase

摘要:

虽然多层系统可以具有全局反演中心,但它们可以具有局部破坏反演对称性的区域。这可以改变这种系统的超导性质。在这里,我们分析二维多层系统产生空间调制反对称自旋轨道耦合(ASOC)和讨论混合宇称序参量的超导性。特别地,在零温度下研究了ASOC对自旋磁化率的影响。对于弱的层间耦合,我们发现ASOC诱导的自旋磁化率增强,这暗示了这方面的潜在重要性,在特殊结构的超晶格超导相。

英文摘要:

While multi-layer systems can possess global inversion centers, they can have regions with locally broken inversion symmetry. This can modify the superconducting properties of such a system. Here we analyze two dimensional multi-layer systems yielding spatially modulated antisymmetric spin-orbit coupling (ASOC) and discuss superconductivity with mixed parity order parameters. In particular, the influence of ASOC on the spin susceptibility is investigated at zero temperature. For weak inter-layer coupling we find an enhanced spin susceptibility induced by ASOC, which hints the potential importance of this aspect for superconducting phase in specially structured superlattices.

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