fermion

From Fermi +‎ -on. Named after Italian-American physicist Enrico Fermi. Coined by English physicist Paul Dirac in 1945 in a lecture titled "Developments in Atomic Theory".

• IPA^(key): /ˈfɜːmɪɒn/

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fermion (plural fermions)

1. (particle physics, Standard Model) Any elementary or composite particle that has half-integer spin and thus obeys Fermi–Dirac statistics and the Pauli exclusion principle (equivalently, a particle for which the wavefunction of any system of identical such particles changes sign whenever two are swapped); a baryon, a lepton or a quark;
   (slightly more loosely) any such particle or any composite particle composed of fermions.

   The fermions treated by the Standard Model are the (composite) baryons and the (elementary) leptons and quarks.

   According to the spin–statistics theorem, the wavefunction of a system of identical fermions (particles of half-integer spin) is antisymmetric under the operation of swapping any two particles.

   • 1994, István Montvay, Gernot Münster, Quantum Fields on a Lattice, Cambridge University Press, page 208:

     A remarkable feature of lattice regularization is the appearance of several fermion species per fermion field in the lattice action.

   • 1996, Georges Bouzerar, Didier Poilblanc, “Persistent Currents in Interacting Electronic Systems”, in T. Martin, G. Montambaux, J. Trân Thanh Vân, editors, Correlated Fermions and Transport in Mesoscopic Systems, Editions Frontieres, page 149:

     For 2D systems, going beyond first order pertu[r]bative calculations, we show that the second harmonic of the current is strongly suppressed in the case of spinless fermion models but significantly enhanced for the Hubbard model.

   • 1996, Georg G. Raffelt, Stars as Laboratories for Fundamental Physics, University of Chicago Press, page 253:

     It is not known whether the Higgs mechanism is the true source for the masses of the fundamental fermions.

   • 2023 July 6, Jennifer Chu, “MIT physicists generate the first snapshots of fermion pairs”, in MIT News‎^[1]:

     The snapshots were taken by MIT physicists and are the first images that directly capture the pairing of fermions — a major class of particles that includes electrons, as well as protons, neutrons, and certain types of atoms.

• Pauli exclusion principle on Wikipedia.Wikipedia
• Fermi–Dirac statistics on Wikipedia.Wikipedia
• Spin–statistics theorem on Wikipedia.Wikipedia
• Standard Model on Wikipedia.Wikipedia

From Enrico Fermi (Italian-American physicist) +‎ -on.

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• Hyphenation: fer‧mi‧on

fermion n (plural fermionen)

1. (physics) fermion

fermion

1. accusative singular of fermio

• IPA^(key): /fɛʁ.mjɔ̃/

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fermion m (plural fermions)

1. (physics) fermion

Borrowed from English fermion.

fermion (plural fermion-fermion)

1. (physics) fermion

Borrowed from English fermion.

• IPA^(key): /ˈfɛr.mjɔn/

• Audio:

  (file)

• Rhymes: -ɛrmjɔn
• Syllabification: fer‧mion

fermion m inan

1. (particle physics) fermion

• fermion in Polish dictionaries at PWN

Borrowed from English fermion.

fermion m (plural fermioni)

1. fermion