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arXiv 1508.03335cond-mat.supr-concond-mat.str-el
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铜氧化物中键密度波态的Higgs模杂化

Hybridization of Higgs modes in a bond-density-wave state in cuprates

Zachary M. Raines, Valentin G. Stanev, Victor M. Galitski

摘要:

最近,几个小组报告了在欠掺杂铜酸盐中存在的电荷顺序的集体模式的观测结果。受这些实验的启发,我们从理论上研究了纯电荷序和电荷序与超导电性共存时序参量的振荡。使用热点近似,我们发现在共存制度中的两个希格斯模式所产生的杂交的振幅振荡的不同序参量。其中之一具有在单粒子能隙内的最小频率,并且其是温度的非单调函数。其他-高频-模式是顺利地连接到希格斯模式的单阶参数区域,但很快成为过阻尼共存的情况下。我们探索了一个不寻常的低能量阻尼通道的集体模式,这依赖于两个订单的共存所造成的带重建。为了完整性,我们还考虑了阻尼的集体模式起源于节点准粒子。最后,我们讨论了我们的结果的一些实验结果。

英文摘要:

Recently, several groups have reported observations of collective modes of the charge order present in underdoped cuprates. Motivated by these experiments, we study theoretically the oscillations of the order parameters, both in the case of pure charge order, and for charge order coexisting with superconductivity. Using a hot-spot approximation we find in the coexistence regime two Higgs modes arising from hybridization of the amplitude oscillations of the different order parameters. One of them has a minimum frequency that is within the single particle energy gap and which is a non-monotonic function of temperature. The other -- high-frequency -- mode is smoothly connected to the Higgs mode in the single-order-parameter region, but quickly becomes overdamped in the case of coexistence. We explore an unusual low-energy damping channel for the collective modes, which relies on the band reconstruction caused by the coexistence of the two orders. For completeness, we also consider the damping of the collective modes originating from the nodal quasiparticles. At the end we discuss some experimental consequences of our results.

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