Paired states of interacting electrons in a two-dimensional lattice
Physical Review B2010Vol. 82(20)
Citations Over TimeTop 22% of 2010 papers
Abstract
We show that two tight-binding electrons that repel may form a bounded pair in two dimensions. The paired states form a band with energies that scale like the strength of the interaction potential. By applying an electric field we show that the dynamics of such states is that of a composite particle of charge $2e$. The system still sustains Bloch-type states so that if the two bands overlap single and paired states might coexist allowing for a bosonic fluid component that, if condensed, would decrease the resistance at low temperatures. The presence of two bands allows for new oscillations whose experimental detection would permit a direct measurement of the interaction potential strength.
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