近日，美国纽约市立大学Andrea Alù团队报道了Floquet旋转超辐射观测。这一研究成果于2026年7月8日发表在《自然》杂志上。

基于时间驱动的系统为通过时空调制控制波提供了框架，这种调制能够在不借助机械位移的情况下合成有效运动。在该框架内，行波调制可以模拟运动介质，并产生诸如多普勒诱导的非互易性等现象。一个相关的效应是从旋转介质中提取能量，理论上预测当波经历足够大的旋转多普勒频移时会发生这一现象。由于机械旋转系统所需的极限转速，实验上对这一区域的探索一直十分有限。

研究组表明，Floquet诱导旋转能够利用纯粹的时空调制进入这种超快旋转区域。当以有效超光速旋转时，角动量带隙会出现在底层时空晶体的能带结构中。这些带隙容纳了参量过程，能够高效地从Floquet旋转介质中提取能量，从而在耗散塑造的光谱带宽内实现轨道波的角动量选择性放大。

研究组在一个由时间调制谐振器组成的环形网络中实验实现了这一效应，观察到由时空结构介质中的非厄米和参量动力学介导的旋转超辐射Floquet机制。这些结果展示了一个用于研究时空调制介质中旋转能量转移和角动量依赖波放大的可控平台。

附：英文原文

Title: Observation of Floquet rotational super-radiance

Author: Nasari, Hadiseh, Moussa, Hady, Kasahara, Yoshiaki, Thielens, Arno, Al, Andrea

Issue&Volume: 2026-07-08

Abstract: Time-driven systems provide a framework for controlling waves through spatio-temporal modulation, which enables the synthesis of effective motion without mechanical displacement1,2,3,4,5,6,7. Within this framework, travelling-wave modulations can emulate moving media and give rise to phenomena such as Doppler-induced non-reciprocity8,9,10. A related effect is the extraction of energy from rotating media, which has been theoretically predicted to occur when waves experience sufficiently large rotational Doppler shifts11,12,13,14,15,16,17. Experimental access to this regime has remained limited due to the extreme rotation speeds required in mechanically rotating systems18,19,20,21. Here we show that Floquet-induced rotation enables access to such ultrafast rotational regimes using purely spatio-temporal modulation. When spinning at effective superluminal speeds, angular-momentum bandgaps emerge in the band structure of the underlying space–time crystal. These gaps host parametric processes that efficiently extract energy from the Floquet-rotating medium, resulting in angular-momentum-selective amplification of orbital waves within a dissipation-shaped spectral bandwidth. We realize this effect experimentally in a ring network of time-modulated resonators, where we observe a Floquet regime of rotational super-radiance mediated by non-Hermitian and parametric dynamics in space–time structured media. These results demonstrate a controllable platform for studying rotational energy transfer and angular-momentum-dependent wave amplification in space–time-modulated media.

DOI: 10.1038/s41586-026-10725-y

Source: https://www.nature.com/articles/s41586-026-10725-y

期刊信息

Nature：《自然》，创刊于1869年。隶属于施普林格·自然出版集团，最新IF：69.504

官方网址：http://www.nature.com/

投稿链接：http://www.nature.com/authors/submit_manuscript.html