Ma Qijun, Chen Xue, Xiong Qisen, Jiang Leyong, Xiang Yuanjiang
School of Physics and Electronics, Hunan Normal University, Changsha 410081, China.
School of Physics and Electronics, Hunan University, Changsha 410081, China.
Nanophotonics. 2023 Oct 5;12(20):3911-3920. doi: 10.1515/nanoph-2023-0345. eCollection 2023 Oct.
Both the nonreciprocal surface modes in Weyl semimetal (WSM) with a large anomalous Hall effect and the nonreciprocal photon occupation number on a graphene surface induced by the drift current provide a promising way to manipulate the nonreciprocal near-field energy transfer. Interestingly, the interactions between nonreciprocities are highly important for research in (thermal) photonics but remain challenging. In this study, we theoretically investigated the near-field radiative heat flux transfer between a graphene heterostructure supported by a magnetic WSM and a twist-Weyl semimetal (T-WSM). The nonreciprocal surface mode could be changed by the separation space between two Weyl nodes and the twist angle. Notably, we found that in the absence of a temperature difference between two parallel plates, nonequilibrium fluctuations caused by drift currents led to the transfer of near-field radiative heat flux. Furthermore, these nonreciprocal surface modes interacted with the nonreciprocal photon occupation number in graphene to achieve flexible manipulation of the near-field heat flux size and direction. Additionally, graphene adjustable flux in the case of a temperature difference between the two plates was also discussed. Our scheme can provide a reference for near-field heat flux regulation in nonequilibrium systems.
具有大反常霍尔效应的外尔半金属（WSM）中的非互易表面模式以及由漂移电流诱导的石墨烯表面上的非互易光子占据数，都为操纵非互易近场能量转移提供了一条很有前景的途径。有趣的是，非互易性之间的相互作用对于（热）光子学研究非常重要，但仍然具有挑战性。在本研究中，我们从理论上研究了由磁性WSM支撑的石墨烯异质结构与扭曲外尔半金属（T-WSM）之间的近场辐射热通量转移。非互易表面模式可以通过两个外尔节点之间的分离空间和扭曲角来改变。值得注意的是，我们发现，在两个平行板之间不存在温差的情况下，由漂移电流引起的非平衡涨落导致了近场辐射热通量的转移。此外，这些非互易表面模式与石墨烯中的非互易光子占据数相互作用，以实现对近场热通量大小和方向的灵活操纵。此外，还讨论了在两板之间存在温差的情况下石墨烯的可调通量。我们的方案可以为非平衡系统中的近场热通量调控提供参考。
