Near Field Propulsion Forces from Nonreciprocal Media
Near Field Propulsion Forces from Nonreciprocal Media
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来自不可逆介质的近场推进力
DOI：
10.1103/physrevlett.126.170401
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发表时间：
2021
影响因子：
8.6
通讯作者：
Krüger, Matthias
中科院分区：
文献类型：
--
作者：
Gelbwaser-Klimovsky, David;Graham, Noah;Kardar, Mehran;Krüger, Matthias
基于对称性和热力学的论证可能表明，在不同温度的两个板之间存在棘齿状的横向Casimir力，并且具有破坏的反转对称性。我们发现这是不够的，至少必须有一个盘子是由非互易材料制成的。这种装置通过将热辐射转化为机械力来作为热机运行。尽管近场区域的侧向力与热传递的比率与平板分离成反比，但Onsager对称性(我们将其推广到非互易平板)将发动机效率限制在卡诺值。在远场中的最佳运行速度约为光速。在近场区域，这种速度可以降低到数量级，其中存在一个典型的材料频率。
Arguments based on symmetry and thermodynamics may suggest the existence of a ratchetlike lateral Casimir force between two plates at different temperatures and with broken inversion symmetry. We find that this is not sufficient, and at least one plate must be made of nonreciprocal material. This setup operates as a heat engine by transforming heat radiation into mechanical force. Although the ratio of the lateral force to heat transfer in the near field regime diverges inversely with the plates separation,, an Onsager symmetry, which we extend to nonreciprocal plates, limits the engine efficiency to the Carnot value. The optimal velocity of operation in the far field is of the order of, whereis the speed of light. In the near field regime, this velocity can be reduced to the order of, whereis a typical material frequency.