强关联材料在临界动力学态下观测到的普遍谱塌缩证据
Evidence of universal spectral collapse at a marginal dynamical regime
AI总结：
本研究通过ARPES谱分析，揭示强关联材料在临界动力学态下，不相干谱可统一描述为抛物线柱函数形式，表明微观细节在低能下无关。
摘要：
在强关联材料中，无序或材料特定机制通常被归因于不相干的电子态。在这里，我们展示不相干谱实际上是自生成的动力学无序与竞争涨落相关的结果。在该状态下，电子动力学与时间依赖散射自然产生一种谱函数形式 rho (z) = exp(-z^2/4) Dnu (z)，其中 z 是缩放后的能量，Dnu 表示抛物线柱函数。这种形式反映了一种非马尔可夫时间相关性的临界动力学状态。将这种缩放函数应用于角分辨光电子能谱（ARPES）能量分布曲线，从铜氧化物 Nd2-xCexCuO4 和 Bi2Sr2CaCu2O8+delta、 Kagome 金属 CsCr3Sb5 和双层镍酸盐 La3Ni2O7 的数据中，发现不相干谱被 rho (z) 量化描述，仅在非普遍的幅度和能量尺度上有所不同。在重新缩放后，数据集坍缩到一条单一的通用曲线上，其特征由固定的抛物线柱阶数 nu = -1/2 表征。观测到的谱塌缩表明了一种固定点状状态，在此状态下，微观细节如晶格几何、带结构和化学组成在低能下变得无关。这些结果为跨多种强关联材料的连续主导 ARPES 谱建立了统一且定量的框架。
英文摘要：
Incoherent electronic states in strongly correlated materials are commonly attributed to disorder or material specific mechanisms. Here we show that incoherent spectra instead arise from self-generated dynamical disorder associated with competing fluctuations. In this regime, electron dynamics coupled to time-dependent scattering naturally produce a spectral function of the form rho (z) = exp(-z^2/4) Dnu (z), where z is a scaled energy and Dnu denotes the parabolic cylinder function. This form reflects a marginal dynamical regime characterized by non-Markovian temporal correlations. Applying this scaling function to angle resolved photoemission spectroscopy (ARPES) energy distribution curves from the cuprates Nd2-xCexCuO4 and Bi2Sr2CaCu2O8+delta, the Kagome metal CsCr3Sb5, and the double-layer nickelate La3Ni2O7, we find that incoherent spectra are quantitatively described by rho (z), differing only in non-universal amplitude and energy scales. After rescaling, the datasets collapse onto a single universal curve characterized by a fixed parabolic-cylinder order nu = -1/2. The observed spectral collapse indicates a fixed-point-like regime in which microscopic details such as lattice geometry, band structure, and chemical composition become irrelevant at low energies. These results establish a unified and quantitative framework for continuum-dominated ARPES spectra across diverse strongly correlated materials.
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