标题： “半玻利乌博尼”作为欠掺杂铜氧化物中相位相干的中间态 显示英文标题

标题： "Half-Bogoliubons" as the intermediate states for the phase coherence in underdoped cuprates

摘要： 超导性是通过电子配对以及库珀对之间的相位相干实现的。 根据巴丁-库珀-施里弗理论，存在具有玻利亚丘夫色散的准粒子，并在单粒子隧穿谱中显示出粒子-空穴对称的相干峰。 在这里，我们报告了在欠掺杂铜氧化物超导体Bi2Sr2-xLaxCuO6单晶（p=0.114）中观察到的两种隧穿谱，它们仅显示“相干峰”的一侧，但具有对称的能量（约±11 meV），这些单晶具有部分超导性。 将这两种谱合并可以模拟完整的玻利亚丘夫色散，因此我们将与这些半峰谱相关的电子态称为“半玻利亚丘布隆”。 在以前的研究中，已经表明两个掺杂的空穴可能在CuO键的4a0 x 4a0晶格内结合成一个局域对（a0：最近邻Cu原子之间的距离）。 我们将“半玻利亚丘布隆”归因于相位相干的中间态，并且它们对应于从两个空穴的局域配对态激发出来的三空穴和一空穴态。 这两个“半玻利亚丘布隆”的纠缠意味着电荷自由度的动态跳跃，从而导致局域配对态之间的相位相干。 我们的结果揭示了一个独特的建立相位相干的过程，该过程通过在具有局域对的区域之间交换电荷来实现。 显示英文摘要

摘要： Superconductivity is achieved by the pairing of electrons and phase coherence between the Cooper pairs. According to the Bardeen-Cooper-Schrieffer theory, the quasiparticles with Bogoliubov dispersion exists and reveal particle-hole symmetric coherence peaks on the single particle tunneling spectrum. Here we report the observation of two kinds of tunneling spectra showing only one side of the "coherence peak" but with symmetric energies (about +-11 meV) in underdoped cuprate superconductor Bi2Sr2-xLaxCuO6 single crystals (p=0.114) with fractional superconductivity. Merging these two kinds of spectra can mimic the complete Bogoliubov dispersion, thus we name the electronic states associated with these half-peaked spectrum as "half Bogoliubons". In previous studies, it was shown that two doped holes may bind into a local pair within the 4a0 x 4a0 plaquette of CuO bonds (a0: distance between nearest Cu atoms). We attribute the "half-Bogoliubons" to the intermediate states for the phase coherence, and they correspond to the three-hole and one-hole states as the excited ones from the local pairing state of two holes. An entanglement of these two "half-Bogoliubons" would mean the dynamic hopping of charge freedom resulting in the phase coherence between the local paired states. Our results unravel a unique process for establishing the phase coherence through exchanging a charge between the regions with local pairs.