Correlated metallic two particle bound states in quasiperiodic chains

Abstract

Single particle states in a chain with quasiperiodic potential show a metal-insulator transition upon the change of the potential strength. We consider two particles with local interaction in the single particle insulating regime. The two particle states change from being localized to delocalized upon an increase of the interaction strength to a nonperturbative finite value. At even larger interaction strength the states become localized again. This transition of two particle bound states into a correlated metal is due to a resonant mixing of the noninteracting two particle eigenstates. In the discovered correlated metal states two particles move coherently together through the whole chain, therefore contributing to a finite conductivity.

4 pages, 4 figures

References in corpus (4)

• Single-Spin Addressing in an Atomic Mott Insulator
• Repulsively bound atom pairs in an optical lattice
• Realization of Discrete Quantum Billiard in 2D Optical Lattices
• Two interacting particles in a random potential

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