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## Main Question or Discussion Point

Can we have a coherent state between a fermion and a photon! I mean can there ever be a fermionic polariton?

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- Thread starter sugeet
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Can we have a coherent state between a fermion and a photon! I mean can there ever be a fermionic polariton?

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- #3

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The Wiki page says :"The polariton is a bosonic quasiparticle, and should not be confused with the polaron, a fermionic one, e.g. an electron plus attached phonon cloud. ".

Precisely something I was looking for, if you are still interested we can discuss

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DrDu

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This is calles univalence superselection rule. It is easiest to see from the fact that such a superposition is not invariant (not even up to a phase) under a rotation by 2π.

A
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