Delocalization of two-particle ring near the Fermi level of 2d Anderson model

摘要

We study analytically and numerically the problem of two particles with along range attractive interaction on a two-dimensional (2d) lattice withdisorder. It is shown that below some critical disorder the interaction createsdelocalized coupled states near the Fermi level. These states appear insidewell localized noninteracting phase and have a form of two-particle ring whichdiffusively propagates over the lattice.