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Why a pair is exciton?

  1. May 12, 2010 #1
    hey,

    i cant understand what is the motivation of defining pair of hole and electron as
    a single particle, exciton. thus they seem to have distinct motion and space. so
    why still we treat them as excitons?
     
  2. jcsd
  3. May 12, 2010 #2

    ZapperZ

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    Staff Emeritus
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    Because they are still coupled together and can be treated as "one".

    There's nothing unusual here. You treat a collection of electrons, protons, and neutrons as "one" entity and called it an 'atom'. As long as there's some form of coupling that allows us to treat a system as being an entity (and back it up with valid observations), then then treatment is perfectly fine.

    Zz.
     
  4. May 12, 2010 #3
    thanks,

    that was very helpful :smile:

    omri
     
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