The content presents a quantum mechanical approach to deriving the Faraday effect, which is the rotation of the polarization of linearly polarized light when passing through a medium in the presence of a parallel static magnetic field.
The key points are:
The approach does not rely on the classical explanation of circular birefringence, but instead treats the light as a quantized electromagnetic field and the effect as a forward Rayleigh scattering process between two orthogonal modes of the field.
The authors use a two-state approximation, similar to the one commonly found in quantum optics, to model the dynamics of the combined system of the quantized light field and the molecules.
For a single molecule, the angle of optical rotation is derived in terms of the quantum transition amplitude between the two states. For a gas of molecules, the total optical rotation angle is calculated by considering the coherent forward scattering process.
The authors show that the Faraday effect can be described as a quantum transition between two orthogonal states of the quantized electromagnetic field, with virtual transitions induced by the external magnetic field.
This approach is presented as an alternative to previous methods based on molecular property tensors, and it highlights the quantum features of the Faraday effect, which is often considered at the classical level.
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by Benjamin W. ... a las arxiv.org 10-03-2024
https://arxiv.org/pdf/2410.01612.pdfConsultas más profundas