用nano-ARPES研究YBa $_2$ Cu $_4$ O $_8$中的CuO双埋链
Buried double CuO chains in YBa$_2$Cu$_4$O$_8$ uncovered by nano-ARPES
摘要：
在CuO链中的电子动力学一直难以捉摸的Y-Ba-Cu-O铜酸盐系统通过标准角分辨光电子能谱（ARPES），裂解样品表现出的领域终止于CuO链或BaO层，和一个典型的光束的大小结果ARPES信号，从两个终端叠加。在这里，我们采用空间分辨的ARPES与亚微米束（nano-ARPES），揭示了在YBa $_2$ Cu $_4$ O $_8$双CuO链的表面终止依赖的电子结构。我们提出了第一次观察到尖锐的金属色散和费米面的双CuO链埋在下面的CuO $_2$ -平面块上的BaO终止表面。虽然所观察到的费米面的CuO链是高度一维的，在CuO链中的电子不进行显着的电子相关性和没有签名的Tomonaga-Luttinger液体也不是边际费米液体被found. We的工作代表了一个重要的实验步骤，了解的电荷动力学，并提供了一个起始基础，为高$T_c$超导YBCO铜酸盐系统的建模。
英文摘要：
The electron dynamics in the CuO chains has been elusive in Y-Ba-Cu-O cuprate systems by means of standard angle-resolved photoemission spectroscopy (ARPES); cleaved sample exhibits areas terminated by both CuO-chain or BaO layers, and the size of a typical beam results in ARPES signals that are superposed from both terminations. Here, we employ spatially-resolved ARPES with submicrometric beam (nano-ARPES) to reveal the surface-termination-dependent electronic structures of the double CuO chains in YBa$_2$Cu$_4$O$_8$. We present the first observation of sharp metallic dispersions and Fermi surfaces of the double CuO chains buried underneath the CuO$_2$-plane block on the BaO terminated surface. While the observed Fermi surfaces of the CuO chains are highly one-dimensional, the electrons in the CuO-chains do not undergo significant electron correlations and no signature of a Tomonaga-Luttinger liquid nor a marginal Fermi liquid is found. Our works represent an important experimental step toward understanding of the charge dynamics and provides a starting basis for modelling the high-$T_c$ superconductivity in YBCO cuprate systems.
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