论文标题
用Tr-arpes的淬灭超导体中冷凝物动态和希格斯振荡的动量分辨分析
Momentum-resolved analysis of condensate dynamic and Higgs oscillations in quenched superconductors with tr-ARPES
论文作者
论文摘要
非平衡超导体中的HIGGS振荡提供了独特的工具，以获取有关基础订单参数的信息。可以在HIGGS振荡频谱中编码几种属性，例如绝对值，多个间隙的存在以及阶参数的对称性。通过时间分辨角度分辨的光发射光谱（ARPE）研究希格斯振荡比光学测量的优势是，对冷凝物动态的动量分解分析是可能的。在本文中，我们研究了在ARPE中测得的不同淬灭协议中测量的时间分辨光谱函数。我们发现，分析整个布里鲁因区域ARPES强度的振幅振荡允许了解凝聚力动态如何有助于集体HIGGS振荡的出现。此外，通过评估这些振荡的相位，可以揭示冷凝物的对称变形动态，从而深入了解系统的基态对称性。通过这样的分析，将来可以将时间分辨的ARPES实验用作HIGGS光谱领域的强大工具。
Higgs oscillations in nonequilibrium superconductors provide an unique tool to obtain information about the underlying order parameter. Several properties like the absolute value, existence of multiple gaps and the symmetry of the order parameter can be encoded in the Higgs oscillation spectrum. Studying Higgs oscillations with time-resolved angle-resolved photoemission spectroscopy (ARPES) has the advantage over optical measurements that a momentum-resolved analysis of the condensate dynamic is possible. In this paper, we investigate the time-resolved spectral function measured in ARPES for different quench protocols. We find that analyzing amplitude oscillations of the ARPES intensity in the whole Brillouin zone allows to understand how the condensate dynamic contributes to the emerging of collective Higgs oscillations. Furthermore, by evaluating the phase of these oscillations the symmetry deformation dynamic of the condensate can be revealed, which gives insight about the ground state symmetry of the system. With such an analysis, time-resolved ARPES experiments might be used in future as a powerful tool in the field of Higgs spectroscopy.
