Symmetries in time-varying media: on the conservation of spin angular momentum, helicity, and chirality
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Our results demonstrate that time-varying media exacerbate the differences between the symmetries and conserved quantities associated with dynamical properties associated with the circular polarization of light. In this manner, we provide further insights into the physical meaning of helicity and chirality, including their similarities and differences, as well as the fundamental role played by the symmetries of the electromagnetic Lagrangian in time-varying media.
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