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Electrons are not elementary particles?

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  1. Sep 21, 2015 #1

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  2. jcsd
  3. Sep 21, 2015 #2

    e.bar.goum

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    It's says so right there in the second paragraph of your link:

    See also, the definition of "quasi":

    http://www.oxforddictionaries.com/definition/english/quasi-[/URL]

    So these quasiparticles aren't actually 'real' particles in the standard model sense, but are emergent from the behaviour of electrons in solids or collections of atoms. There are a lot of quasiparticles - the notion of the 'phonon' is probably the most important/famous one - modes of vibration in the crystal lattice. [URL='[PLAIN]https://en.wikipedia.org/wiki/List_of_quasiparticles']https://en.wikipedia.org/wiki/List_of_quasiparticles[/URL]
    [/URL]
    ETA: wikipedia link [URL]https://en.wikipedia.org/wiki/Quasiparticle[/URL]

    [QUOTE]In physics, [B]quasiparticles[/B] and [B]collective excitations[/B] (which are closely related) are emergent phenomena that occur when a microscopically complicated system such as a solid behaves [I]as if[/I] it contained different weakly interacting particles in free space. For example, as an electron travels through a semiconductor, its motion is disturbed in a complex way by its interactions with all of the other electrons and nuclei; however it [I]approximately[/I] behaves like an electron with a [I]different mass[/I] traveling unperturbed through free space. This "electron" with a different mass is called an "electron quasiparticle".[1] In another example, the aggregate motion of electrons in the valence band of a semiconductor is the same as if the semiconductor contained instead positively charged quasiparticles called holes. Other quasiparticles or collective excitations include phonons (particles derived from the vibrations of atoms in a solid), plasmons (particles derived from plasma oscillations), and many others.[/QUOTE]

    Think of them as convenient ways to deal with quantum many body dynamics.
     
    Last edited by a moderator: May 7, 2017
  4. Sep 21, 2015 #3
    Well, these are called quasiparticles for a reason. This has more to do with the weirdness of the quantum world than the electron not being a fundamental particle. See this.
     
  5. Sep 21, 2015 #4

    Nugatory

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  6. Sep 22, 2015 #5

    Demystifier

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    To use an analogy from everyday life, this is not much different from spliting a man into a naked man and his clothes. The electron-experiment above has no more implications for the standard model than my man-experiment has for biology.
     
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