Dirac fermion

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In physics, a Dirac fermion is a fermion which is not its own antiparticle. It is named for Paul Dirac. They can be modelled with the Dirac equation.

The alternative to a Dirac fermion is a Majorana fermion.

In particle physics, all fermions in the standard model, except possibly neutrinos, are Dirac fermions.

In condensed matter physics, low-energy excitations in graphene and topological insulators, among others, are fermionic quasiparticles described by a pseudo-relativistic Dirac equation.

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