A heat-powered emitter can sometimes exceed the Planck thermal-emission limit. We clarify when such super-Planckian emission is possible, arguing that far-field super-Planckian emission requires a distribution of energy that is not consistent with a unique temperature, and therefore the process should not be called ‘thermal emission’.

中文翻译：

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超普朗克发射不可能真的是“热”的

热能发射器有时会超过普朗克热发射极限。我们澄清了这种超普朗克发射何时可能成为可能，认为远场超普朗克发射需要与独特温度不一致的能量分布，因此该过程不应称为“热发射”。