Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-03-15
Phys. Rev. B 78, 085108 (2008) (6 pages)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 5 figures
Scientific paper
10.1103/PhysRevB.78.085108
Using the Bethe-ansatz density-functional theory, we study a one-dimensional Hubbard model of confined attractively interacting fermions in the presence of a uniformly distributed disorder. The strongly-correlated Luther-Emery nature of the attractive one-dimensional Hubbard model is fully taken into account as the reference system in the density-functional theory. The effects of the disorder are investigated on the atomic-density waves in the weak-to-intermediate attractive interaction and on the spin-singlet dimers of doubly occupied sites in the strongly attractive regime. It is found that atomic density waves are sensitive to the disorder and the spin-singlet dimers of doubly occupied sites are quite unstable against the disorder. We also show that very weak disorder could smear the singularities in the stiffness, thus suppress the spin-singlet pairs.
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