漂移超表面中近场辐射的扭曲加热-冷却转变
Twisted Heating-Cooling Transition of Near-field Radiation in Drifted Metasurfaces
AI总结：
本文研究漂移石墨烯超表面间扭曲近场辐射，发现冷到热的非常规热流及热魔角触发的加热-冷却转变，并揭示距离调控的热绝缘与冷却增强效应，为可调谐辐射热管理提供新途径。
摘要：
魔角扭曲双层系统在二维电子或光子平台中引发了许多奇异现象。在此，我们研究了具有非平衡漂移狄拉克电子的石墨烯超表面之间的扭曲近场能量辐射。异常地，我们发现了一种非常规辐射通量，可将热量从冷端导向热端。这种远离平衡的现象导致了超越热魔角扭曲角的加热-冷却转变，该转变由扭曲诱导的光子拓扑转变促成。其潜在机制与漂移等离激元极化子的非互易性质及其拓扑特征协同作用所导致的光谱匹配与失配有关。此外，我们报告了大扭曲角下辐射能量通量的非直观距离依赖性。当距离增加到临界距离时，近场辐射变为热绝缘，随后随着距离进一步增加，辐射通量发生反转，使冷却功率增大。我们的结果表明了非平衡漂移与扭曲器件的光明前景，并为可调谐辐射热管理铺平了道路。
英文摘要：
The magic angle twisted bilayer systems give rise to many exotic phenomena in two-dimensional electronic or photonic platforms. Here, we study the twisted near-field energy radiation between graphene metasurfaces with nonequilibrium drifted Dirac electrons. Anomalously, we find unconventional radiative flux that directs heat from cold to hot. This far-from-equilibrium phenomenon leads to a heating-cooling transition beyond a thermal magic twist angle, facilitated by twist-induced photonic topological transitions. The underlying mechanism is related to the spectrum match and mismatch caused by the cooperation between the non-reciprocal nature of drifted plasmon polaritons and their topological features. Furthermore, we report the unintuitive distance dependence of radiative energy flux under large twist angles. The near-field radiation becomes thermal insulating when increasing to a critical distance, and subsequently reverses the radiative flux to increase the cooling power as the distance increases further. Our results indicate the promising future of nonequilibrium drifted and twisted devices and pave the way towards tunable radiative thermal management.
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