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Both orbital and spin torques originate from r x g
Published 7 Jun 2024 in physics.optics | (2406.04982v1)
Abstract: Does the cross-product of the position and the electromagnetic momentum density, g, include the optical spin momentum? We answer this long-standing question in the affirmative by evaluating, explicitly, the torque exerted on a particle by a beam of light carrying angular momentum.
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