论文标题
电磁场和物质的总螺旋性
Total helicity of electromagnetic fields and matter
论文作者
论文摘要
自由电磁场和静态磁性螺旋性的电磁螺旋性显示为相同物理量的两个不同实施方案，即总螺旋性。总的螺旋度是两个术语的总和：一个术语，该术语可以测量自由场的左手和右手光子数量之间的差，而另一个术语可以测量物质中静态磁化密度的螺丝率。每个术语是不同频率制度中总螺旋性的表现：$ω$> 0和$ω$ = 0。该统一建立了理论基础，用于研究光 - 物质相互作用时总螺旋性的两个实施方案之间的转换。
The electromagnetic helicity of the free electromagnetic field and the static magnetic helicity are shown to be two different embodiments of the same physical quantity, the total helicity. The total helicity is the sum of two terms: a term that measures the difference between the number of left-handed and right-handed photons of the free field, and another term that measures the screwiness of the static magnetization density in matter. Each term is the manifestation of the total helicity in different frequency regimes: $ω$ > 0 and $ω$ = 0, respectively. This unification establishes the theoretical basis for studying the conversion between the two embodiments of total helicity upon light-matter interaction.
