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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.
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).
All known fermions except neutrinos, are also Dirac fermions; that is, each known fermion has its own distinct antiparticle. It is not known whether the neutrino is a Dirac fermion or a Majorana fermion. [4] Fermions are the basic building blocks of all matter. They are classified according to whether they interact via the strong interaction or ...
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Majorana fermion: A quasiparticle equal to its own antiparticle, emerging as a midgap state in certain superconductors Nematicon: A soliton in nematic liquid-crystal media Orbiton [14] A quasiparticle resulting from electron spin–orbital separation: Oscillon: A soliton-like single wave in vibrating media Pines' demon