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arXiv 2103.00477cond-mat.mes-hallphysics.app-ph
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扭曲双层石墨烯间的近场热输运

Near-field thermal transport between twisted bilayer graphene

Fuwei Yang, Bai Song

摘要:

热流的主动控制在热管理和能量转换中具有基础性和应用性。在这里,我们提出了一个波动的电动力学研究扭曲双层石墨烯(TBLG)之间的热辐射,其不寻常的和高度可调的等离子体特性的动机。我们发现,近场热流可以变化超过10倍,只有几个度的扭曲,并确定特殊的角度导致热流极值。这些特殊的角度由TBLG的带内光学电导率中的Drude重量决定,并且与化学势大致呈线性关系。此外,我们观察到多带热输运由于带间跃迁的作用随着扭转角的减小而增加,类似于磁场中的单层石墨烯。我们的研究结果是通过TBLG中的表面等离子体来理解的,并强调了其操纵辐射热流的潜力。

英文摘要:

Active control of heat flow is of both fundamental and applied interest in thermal management and energy conversion. Here, we present a fluctuational electrodynamic study of thermal radiation between twisted bilayer graphene (TBLG), motivated by its unusual and highly tunable plasmonic properties. We show that near-field heat flow can vary by more than 10-fold over only a few degrees of twist, and identify special angles leading to heat flow extrema. These special angles are dictated by the Drude weight in the intraband optical conductivity of TBLG, and are roughly linear with the chemical potential. Further, we observe multiband thermal transport due to the increasing role of interband transitions as the twist angle decreases, in analogy to monolayer graphene in a magnetic field. Our findings are understood via the surface plasmons in TBLG, and highlight its potential for manipulating radiative heat flow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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