论文标题
丘比特的电荷密度波激发的性质
Nature of the charge-density wave excitations in cuprates
论文作者
论文摘要
库酸酯的谐振非弹性X射线散射（RIX）光谱中电荷密度波（CDW）相关的效应的发现具有诱人的希望，即阐明稳定电子顺序的相互作用。在这里，我们报告了一项对LA2-XSRXCUO4（LSCO）的全面RIXS研究，发现CDW效应持续至X = 0.21的掺杂水平非常高，然后在X = 0.25时消失。尽管在费米表面跨越了拓扑过渡，但非弹性激发光谱基本上仍未变化。这表明光谱很少包含或没有直接耦合到费米表面附近的电子激发，而是由声子的共振横截面和CDW诱导的声子构成的谐音横截面所支配。我们根据CDW来解释我们的结果，该CDW是由强相关性和由CDW诱导的晶格修饰驱动的声子响应所产生的。
The discovery of charge-density wave (CDW)-related effects in the resonant inelastic x-ray scattering (RIXS) spectra of cuprates holds the tantalizing promise of clarifying the interactions that stabilize the electronic order. Here, we report a comprehensive RIXS study of La2-xSrxCuO4 (LSCO) finding that CDW effects persist up to a remarkably high doping level of x = 0.21 before disappearing at x = 0.25. The inelastic excitation spectra remain essentially unchanged with doping despite crossing a topological transition in the Fermi surface. This indicates that the spectra contain little or no direct coupling to electronic excitations near the Fermi surface, rather they are dominated by the resonant cross-section for phonons and CDW-induced phonon-softening. We interpret our results in terms of a CDW that is generated by strong correlations and a phonon response that is driven by the CDW-induced modification of the lattice.
