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I read about Bose-Einstein condensate consist of bosonic atoms at incredible low temperature do not obey Pauli exclusion, I am wondering what happens if it is possible to create fermionic photon for example so it obeys Pauli exclusion principle?

Qmechanic
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user6760
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1 Answers1

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Boson and bosonic are a noun and an adjective, such as fermion and fermionic.

To answer your question directly: photon is always a boson, since it has zero spin.

However one uses sometimes term bosonic particle to refer to particles that are really not bosons, but exhibit boson-like behavior. For example, excitons do not really have a well-defined spin, since they are composite exitations of many electrons and holes. Nevertheless, in some conditions that can be viewed as a bound state of a spin-1/2 electron and spin-1/2 hole, in which case they exhibit behavior typical of bosons, such as Bose-Einstein condensation.

Roger V.
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