论文标题
辐射热二极管由非近粒石墨烯等离子体介导的波导介导
Radiative Thermal Diode Mediated by Nonreciprocal Graphene Plasmons Waveguides
论文作者
论文摘要
在这项工作中提出了基于由非临界石墨烯等血浆辅助的纳米颗粒之间的不对称辐射热传递的热二极管。热二极管系统由两个颗粒和一个近距离的漂移悬浮石墨烯片组成。非肾上腺石墨烯等离子体是由石墨烯片中的漂移电流诱导的，然后将粒子在近场状态下发出的波。基于对石墨烯等离子体的繁殖方向的不对称性，观察到两个颗粒之间的热整流。辐射热二极管的性能可以通过调整化学电位或改变石墨烯片中的漂移电流来积极调整。在较大的漂移速度和较小的化学电位的情况下，可以在从远场附近的粒子间距离的范围内实现具有矫正系数极为接近1的完美辐射热二极管。采用石墨烯等离子体的分散关系来分析整流效应的基本物理。另外，由于非近局部石墨烯等离子体的宽带特征，漂移的石墨烯可以充当颗粒之间热整流的通用平台。具有较大粒子共振频率的颗粒更喜欢产生更好的热二极管。这项技术可以在纳米级的热管理领域找到广泛的应用
A thermal diode based on the asymmetric radiative heat transfer between nanoparticles assisted by the nonreciprocal graphene plasmons waveguides is proposed in this work. The thermal diode system consists of two particles and a drift-biased suspended graphene sheet in close proximity of them. Nonreciprocal graphene plasmons are induced by the drift currents in the graphene sheet, and then couple to the waves emitted by the particles in near-field regime. Based on the asymmetry with respect to their propagation direction of graphene plasmons, the thermal rectification between the two particles is observed. The performance of the radiative thermal diode can be actively adjusted through tuning the chemical potential or changing the drift currents in the graphene sheet. With a large drift velocity and a small chemical potential, a perfect radiative thermal diode with a rectification coefficient extremely approaching to 1 can be achieved within a wide range of the interparticle distance from near to far-field. The dispersion relations of the graphene plasmons are adopted to analyze the underlying physics of the rectification effect. In addition, due to the wide band characteristic of the nonreciprocal graphene plasmons, the driftbiased graphene can act as a universal platform for the thermal rectification between particles. The particles with a larger particle resonance frequency are much more preferred to produce a better thermal diode. This technology could find broad applications in the field of thermal management at nanoscale
