Interaction-induced delocalization of quasiparticle pairs in the Anderson insulator

Details Interaction-induced delocalization of quasiparticle pairs in the Anderson insulator Interaction-induced delocalization of quasiparticle pairs in the Anderson insulator

1995-11-07

arxiv.org/abs/cond-mat/9511038v1

Physics

Condensed Matter

4 pages and 3 figures in a uuencoded, compressed tar file; uses revtex and psfig.sty (included); to appear in Europhys. Lett

Scientific paper

It has recently been established that a short-range interaction can strongly delocalize a pair of particles moving in a disordered potential. We investigate whether an analogous effect exists also for pairs of quasiparticles in the Anderson insulator by employing an approximate numerical evaluation of the two-particle Green function of the many-body system. At the Fermi energy, the quasiparticle pair is localized on the scale of the single-particle localization length. The delocalization effect is recovered when the excitation energy of the pair is comparable to the bandwidth.

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