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Quasiparticle — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Quasiparticle
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T23:20:48.543Z
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Quasiparticle — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Quasiparticle (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_2b79ee263ccb (Metraipolis archive dc_2b79ee263ccb, sha256 3d95e638641e01397b9f6a5e3454608804baab4077a9ceb62394519ba619041e)

BibTeX

@misc{dc2b79ee263ccb,
  title = {Quasiparticle — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Quasiparticle},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_2b79ee263ccb; sha256 3d95e638641e01397b9f6a5e3454608804baab4077a9ceb62394519ba619041e},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Quasiparticle. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

In condensed matter physics, a quasiparticle is a concept used to describe a collective behavior of a group of particles that can be treated as if they were a single particle. Formally, quasiparticles and collective excitations are closely related phenomena that arise when a microscopically complicated system such as a solid behaves as if it contained different weakly interacting particles in vacuum. For example, as an electron travels through a semiconductor, its motion is disturbed in a complex way by its interactions with other electrons and with atomic nuclei. The electron behaves as though it has a different effective mass travelling unperturbed in vacuum. Such an electron is called an electron quasiparticle. In another example, the aggregate motion of electrons in the valence band of a semiconductor or a hole band in a metal behave as though the material instead contained positively charged quasiparticles called electron holes. Other quasiparticles or collective excitations include the phonon, a quasiparticle derived from the vibrations of atoms in a solid, and the plasmon, a particle derived from plasma oscillation. These phenomena are typically called quasiparticles if they are related to fermions, and called collective excitations if they are related to bosons, although the precise distinction is not universally agreed upon. Thus, electrons and electron holes (fermions) are typically called quasiparticles, while phonons and plasmons (bosons) are typically called collective excitations. The quasiparticle concept is important in condensed matter physics because it can simplify the many-body problem in quantum mechanics. The theory of quasiparticles was started by the Soviet physicist Lev Landau in the 1930s.

Tema degli esploratori: fisica e astronomia (deposito sistematico; categoria «Condensed matter physics»).
Fonte: Wikipedia in inglese, voce «Quasiparticle» — https://en.wikipedia.org/wiki/Quasiparticle
Wikidata Q1047683 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q1047683
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Quasiparticle?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1335332560, consultata il 2026-10-07T22:57:56.896Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 27474728a0ce7fc08330e5884c07501a34e36012fbe8cd72fca5476a3f3ec994