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arXiv 2202.09655quant-phphysics.optics
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超反冲与光子角动量和线动量密度

Superkicks and the photon angular and linear momentum density

Andrei Afanasev, Carl E. Carlson, Asmita Mukherjee

摘要:

我们解决的问题,适当的定义空间结构的电磁场的动量密度。我们表明,当地获得的动量和角动量的表达式是不相同的,当一个使用正则能量动量张量,而不是对称的贝林凡特能量动量张量电动力学。这对物质与结构光(例如扭曲光子)的相互作用具有重要影响;并且会对小测试物体上感应的力和角动量产生截然不同的结果。我们显示,与数值估计的影响的大小,情况下,典型的和对称的形式引起非常不同的扭矩或(超级踢)反冲动量的小物体或原子转子,在广泛的情况下。

英文摘要:

We address a problem of proper definition of momentum density for spatially structured electromagnetic fields. We show that the expressions for the momentum and angular momentum obtained locally are not the same when one uses the canonical energy-momentum tensor instead of the symmetric Belinfante energy-momentum tensor in electrodynamics. This has important consequences for interaction of matter with structured light, for example, twisted photons; and would give drastically different results for forces and angular momenta induced on small test objects. We show, with numerical estimates of the size of the effects, situations where the canonical and symmetrized forms induce very different torques or (superkick) recoil momenta on small objects or atomic rotors, over a broad range of circumstances.

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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