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A Majorana fermion (/ m aɪ ə ˈ r ɑː n ə / [1]) or Majorana particle is a fermion that is its own antiparticle. They were hypothesised by Ettore Majorana in 1937. The term is sometimes used in opposition to Dirac fermion , which describes fermions that are not their own antiparticles.
Ettore Majorana (/ m aɪ ə ˈ r ɑː n ə /, [2] Italian: [ˈɛttore majoˈraːna]; born on 5 August 1906 – likely dying in or after 1959) [1] was an Italian theoretical physicist who worked on neutrino masses.
In April 2012 his TU Delft research group presented experimental results that provided potential "signatures" of Majorana fermion quasiparticles. [2] [3] [4] These Majorana quasiparticles would be very stable, and therefore suitable for building a quantum computer. [5]
Particles corresponding to Majorana spinors are known as Majorana particles, due to the above self-conjugacy constraint. All the fermions included in the Standard Model have been excluded as Majorana fermions (since they have non-zero electric charge they cannot be antiparticles of themselves) with the exception of the neutrino (which is neutral).
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Weyl fermions (massless), Dirac fermions (massive), and; Majorana fermions (each its own antiparticle). Most Standard Model fermions are believed to be Dirac fermions, although it is unknown at this time whether the neutrinos are Dirac or Majorana fermions (or both). Dirac fermions can be treated as a combination of two Weyl fermions.