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arXiv 1602.06900cond-mat.supr-con
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非均匀超导体中的束缚集体模

Bound collective modes in nonuniform superconductors

Andrew R. Hammer, Anton B. Vorontsov

摘要:

研究了在序参量中存在畴壁缺陷时超导凝聚体的动力学行为。我们发现,打破翻译和反射对称性的结果在新的集体激发,绑定到畴壁区域。两个额外的振幅/希格斯模式低于散装pairbreaking边缘$2Δ$,其中之一是戈德斯通模式消失的激发能。束缚集体模谱与畴壁的拓扑结构和稳定性有关。“非束缚”体集体模和横向规范场主要穿过畴壁传播,但规范场的纵向分量被完全反射。软化的振幅模式表明减少阻尼和可能的路线,其检测在几何约束的超流体或超导铁磁异质结构。

英文摘要:

We study dynamics of a superconducting condensate in the presence of a domain wall defect in the order parameter. We find that broken translation and reflection symmetries result in new collective excitations, bound to the domain wall region. Two additional amplitude/Higgs modes lie below the bulk pairbreaking edge $2Δ$; one of them is a Goldstone mode with vanishing excitation energy. Spectrum of bound collective modes is related to the topological structure and stability of the domain wall. The `unbound' bulk collective modes and transverse gauge field mostly propagate across the domain wall, but the longitudinal component of the gauge field is completely reflected. Softening of the amplitude mode suggests reduced damping and possible route to its detection in geometrically confined superfluids or in superconductor-ferromagnetic heterostructures.

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