In particle physics, a Dirac fermion is a fermion which is not its own anti-particle. It is named for Paul Dirac. All fermions in the Standard Model, except possibly neutrinos, are Dirac fermions. They can be modelled with the Dirac equation.
This term is also used in Condensed Matter Physics to describe low-energy excitations in Graphene and Topological Insulators, among others, which in this regime is described by a pseudo-relativistic Dirac equation.
See also
- Majorana fermion
- Spinor (for mathematical details)
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