# Is there orbital angular momentum for all particles?

Light as an electromagnetic wave can be polarized in different ways, e.g. linear or circular. As far as I understand it currently this can be compared to the spin direction of a propagation electron (spin angular momentum of light). Now I have learned that an electromagnetic wave can also have an orbital angular momentum, which is described for example in Wikipedia as a kind of shifted wavefront. While trying to get my head around these phenomena I was thinking about other wave-like objects in physics besides photons.

Do all particles and/or excitations (e.g. a spin wave) exhibit orbital angular momentum and what are the physical consequences?

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In the very wikipedia link that you posted about the orbital angular momentum of light, there is reference to a paper by Belifante which answers your question for arbitraty fields. –  Vijay Murthy Mar 5 '12 at 14:16
Aren't orbital angular momentum just quantum analog of classical angular momentum? Then all should have it. –  Siyuan Ren Mar 5 '12 at 14:16