Pair formation in two electron correlated chains

Details Pair formation in two electron correlated chains Pair formation in two electron correlated chains

2003-05-08

arxiv.org/abs/cond-mat/0305185v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To appear in J. Phys: Condens. Matter 15 (2003)

Scientific paper

10.1088/0953-8984/15/19/321

We study two correlated electrons in a nearest neighbour tight- binding chain, with both on site and nearest neighbour interaction. Both the cases of parallel and antiparallel spins are considered. In addition to the free electron band for two electrons, there are correlated bands with positive or negative energy, depending on wheather the interaction parameters are repulsive or attractive. Electrons form bound states, with amplitudes that decay exponentially with separation. Conditions for such states to be filled at low temperatures are discussed.

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