高T $_c$铜氧化物中电子-声子耦合的晶格暗散射光
Through a Lattice Darkly -- Shedding Light on Electron-Phonon Coupling in the High T$_c$ Cuprates
摘要：
电子-声子耦合在传统BCS超导中扮演着核心角色，但在高温超导铜氧化物的相图中却扮演着更为微妙的角色。铜氧化物的复杂性增加，可能有许多竞争相，包括电荷，自旋，轨道和晶格有序，使得梳理出任何独特的现象具有挑战性。在这篇综述中，我们提出了我们的工作，利用角分辨光电子能谱（ARPES），探讨的作用，晶格及其对价带电子结构的铜酸盐。我们提供了一个介绍的ARPES技术和它的独特能力，探测玻色子重整化（或“扭结”）的影响，近E $_F$能带结构。我们的调查开始与无处不在的节点铜酸盐扭结导致的方式同位素取代已经摆脱了一个关键的新视角的作用和强度的电子-声子耦合的建立。我们继续与最近发表的工作之间的连接声子色散与非弹性X-射线散射（IXS）和扭折的位置观察到的ARPES节点附近。最后，我们提出了最近和正在进行的ARPES工作，研究如何通过化学压力诱导应变提供了一个潜在的有前途的途径，了解更广泛的作用，晶格的超导相和更大的铜酸盐相图。
英文摘要：
With its central role in conventional BCS superconductivity, electron-phonon coupling has appeared to play a more subtle role in the phase diagram of the high temperature superconducting cuprates. The added complexity of the cuprates with potentially numerous competing phases including charge, spin, orbital, and lattice ordering, makes teasing out any unique phenomena challenging. In this review, we present our work using angle resolved photoemission spectroscopy (ARPES) to explore the role of the lattice and its effect on the valence band electronic structure in the cuprates. We provide an introduction to the ARPES technique and its unique ability to the probe the effect of bosonic renormalization (or "kink") on the near-E$_F$ band structure. Our survey begins with the establishment of the ubiquitous nodal cuprate kink leading to the way isotope substitution has shed a critical new perspective on the role and strength of electron-phonon coupling. We continue with recently published work on the connection between the phonon dispersion as seen with inelastic x-ray scattering (IXS) and the location of the kink as observed by ARPES near the nodal point. Finally, we present very recent and ongoing ARPES work examining how induced strain through chemical pressure provides a potentially promising avenue for understanding the broader role of the lattice to the superconducting phase and larger cuprate phase diagram.
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