Mixed Phase and Bound States in the Phase Diagram of the Extended Hubbard Model |
| M. Bąk
Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland |
| Full Text PDF |
| The paper examines part of the ground state diagram of the extended Hubbard model, with the on-site attraction U<0 and intersite repulsion W>0 in the presence of charge density waves, superconducting andη-superconducting order parameters. We show the possibility of the stabilization of the mixed state, with all three nonzero order parameters, in the model with nearest neighbor interactions. The other result of the paper is application of the exact solution of the Schrödinger equation for the two-electron bound state, as an additional bound for the phase diagram of the model, resulting in the partial suppression of the superconducting state of the s-wave symmetry, in favor of the normal state phase. |
| DOI: 10.12693/APhysPolA.106.637 PACS numbers: 71.10.Fd, 71.10.Hf, 71.27.+a |