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Exciton
An
exciton
is a
bound state
of an
electron
and an
electron hole
which are attracted to each other by the electrostatic
Coulomb force
. It is an electrically neutral
quasiparticle
that exists in
insulators
,
semiconductors
and in some liquids. The exciton is regarded as an elementary excitation of
condensed matter
that can transport energy without transporting net electric charge.
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