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arXiv 1802.03009cond-mat.str-el
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高Tc铜氧化物中的对密度波、电荷密度波和涡旋

Pair density wave, charge density wave and vortex in high Tc cuprates

Zhehao Dai, Ya-Hui Zhang, T. Senthil, Patrick Lee

摘要:

最近的扫描隧道显微镜(STM)实验报告的电荷密度波(CDW)的观察周期约为8a的晕区周围的涡核,在鲜明的对比,通常观察到的约为4a的CDW在铜酸盐。受这项工作的启发,我们研究了一个模型,其中周期为8的双向对密度波(PDW)在发挥作用。这进一步分为两类,(1)PDW是d波超导体的竞争态,并且只能存在于d波序被抑制的涡核附近,以及(2)PDW是主序,即所谓的母态,其在高温和高磁场下持续存在强相位波动,并位于赝能隙现象的后面。我们研究了这些模型中涡核附近的电荷密度波结构。我们强调了d波序参量相绕组的重要性。由于这种缠绕,PDW可以被涡核钉扎并变得静止。此外,周期8CDW继承了该绕组的特性,这引起了傅里叶变换峰的特殊特征,即,它在某些方向上分裂。在滤波数据的傅里叶逆变换中也有一行零。我们建议,这些是关键的实验签名,可以区分PDW驱动的情况下,更平凡的选择,周期8 CDW是主要的。我们讨论了上述选项的利弊。最后,我们试图把STM实验在更广泛的背景下的赝能隙物理的欠掺杂的铜氧化物和这一观察CDW进行非常高的磁场的X射线散射数据的不寻常的属性。

英文摘要:

A recent scanning tunneling microscopy (STM) experiment reports the observation of charge density wave (CDW) with period of approximately 8a in the halo region surrounding the vortex core, in striking contrast to the approximately period 4a CDW that are commonly observed in the cuprates. Inspired by this work, we study a model where a bi-directional pair density wave (PDW) with period 8 is at play. This further divides into two classes, (1) where the PDW is a competing state of the d wave superconductor and can exist only near the vortex core where the d wave order is suppressed, and (2) where the PDW is the primary order, the so called mother state that persists with strong phase fluctuations to high temperature and high magnetic field and lies behind the pseudogap phenomenology. We study the charge density wave structures near the vortex core in these models. We emphasize the importance of the phase winding of the d-wave order parameter. The PDW can be pinned by the vortex core due to this winding and become static. Furthermore, the period 8 CDW inherits the properties of this winding, which gives rise to a special feature of the Fourier transform peak, namely, it is split in certain directions. There are also a line of zeros in the inverse Fourier transform of filtered data. We propose that these are key experimental signatures that can distinguish between the PDW-driven scenario from the more mundane option that the period 8 CDW is primary. We discuss the pros and cons of the options considered above. Finally we attempt to place the STM experiment in the broader context of pseudogap physics of underdoped cuprates and relate this observation to the unusual properties of X ray scattering data on CDW carried out to very high magnetic field.

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