Paired states of interacting electrons in a two-dimensional lattice
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.
- Publication:
-
Physical Review B
- Pub Date:
- November 2010
- DOI:
- 10.1103/PhysRevB.82.205437
- arXiv:
- arXiv:1005.1857
- Bibcode:
- 2010PhRvB..82t5437S
- Keywords:
-
- 73.40.-c;
- 71.10.Pm;
- 71.10.Li;
- 74.20.Rp;
- Electronic transport in interface structures;
- Fermions in reduced dimensions;
- Excited states and pairing interactions in model systems;
- Pairing symmetries;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 7 pages, 3 figures