exciton

the combination of an electron and a positive hole (an empty electron state in a valence band), which is free to move through a nonmetallic crystal ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/e/58

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 tr...
Found on http://en.wikipedia.org/wiki/Exciton
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