Physicists confirm new form of matter excitonium
US and Netherlands-based researchers have proven the existence of a new form of matter excitonium, almost 50 years after it was theorised. Excitonium is a condensate made of excitons, particles formed in a quantum mechanical pairing of an escaped electron and the hole it left behind. The hole behaves like a positive charge and attracts negatively-charged electrons to form excitons.