Why is a Pair of Electrons and Holes an Exciton?

[omri3012]

hey,

i can't 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?

 

[ZapperZ]

hey,

i can't 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?

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.

 

[omri3012]

thanks,

that was very helpful

omri