AI 中文总结
评论《二维中 Kardar-Parisi-Zhang 普适标度的观测》，重新分析其二维极化激元凝聚体发射相干性衰减实验数据，发现原数据未恰当分析，数据坍缩到 KPZ 标度函数是假象，原论文主要主张不合理。
AI 中文摘要
在发表于《科学》392, 221 (2026) 的论文中，Widmann 及其合作者报告了干涉测量实验，以探索耦合谐振器阵列中产生的二维极化激元凝聚体的发射相干性衰减情况。作者声称在测量的时空相干性衰减中发现了 Kardar-Parisi-Zhang（KPZ）普适标度的证据。然而，我们认为数据未得到恰当分析。我们重新分析了在方形和三角形晶格上、不同激发功率下获取的实验数据。发现在论文所考虑的空间（时间）窗口中，对于所有激发功率，在\(\delta t = 0\)（\(|\delta {\bf r}| \)接近\(0\)）时测量的\(|g^{(1)}(\delta {\bf r}, \delta t)|\)呈现高斯（指数）衰减，而非拉伸指数衰减。结果，使用时间和空间指数\(\beta = 0.5\)和\(\chi = 1\)时，所有泵浦功率的数据并未坍缩到单个曲线，即不是 KPZ 标度函数。特别是，我们表明数据坍缩到论文中呈现的 KPZ 标度函数是不正确数据归一化导致的假象。因此，我们得出结论，该论文的主要主张不合理，因为在论文分析的时空窗口中，相干性的时空衰减不能很好地用 KPZ 普适行为来描述。
英文摘要
In their paper published in Science 392, 221 (2026), Widmann and collaborators reported interferometry experiments to explore the emission coherence decay of a two-dimensional polariton condensate generated in an array of coupled resonators. The authors claim evidence of Kardar--Parisi--Zhang (KPZ) universal scaling in the measured spatio-temporal coherence decay. We argue in the following that the data were not properly analyzed. We re-analyze the experimental data acquired both with the square and the triangular lattices for various values of the excitation power. Instead of stretched exponential decays, in the space (time) windows considered in the paper we find that the measured $|g^{(1)}(δ{\bf r}, δt)|$ at $δt=0$ ($|δ{\bf r}| $ close to $0$) rather show Gaussian (exponential) decay for all excitation powers. As a result, using as temporal and spatial exponents $β=0.5$ and $χ=1$, the data for all pump powers are found to collapse onto a single curve, which is not the KPZ scaling function. In particular, we show that the data collapse onto the KPZ scaling function presented in the paper is an artifact stemming from incorrect data normalization. We thus conclude that the main claim of the paper is not justified as the spatio-temporal decays of the coherence over the space-time windows analyzed in the paper are not well described by the KPZ universal behavior.
CommentsComment on arXiv:2506.15521, 14 pages, 11 figures
