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Single particle states in a chain with quasiperiodic potential show ametal-insulator transition upon the change of the potential strength. Weconsider two particles with local interaction in the single particle insulatingregime. The two particle states change from being localized to delocalized uponan increase of the interaction strength to a nonperturbative finite value. Ateven larger interaction strength the states become localized again. Thistransition of two particle bound states into a correlated metal is due to aresonant mixing of the noninteracting two particle eigenstates. In thediscovered correlated metal states two particles move coherently togetherthrough the whole chain, therefore contributing to a finite conductivity.

Correlated metallic two particle bound states in quasiperiodic chains