Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-01-10
Phys. Rev. B, 72, 165338 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
16 pages, 21 figures; minor changes (blanks missing, sentences starting with a mathematical symbol)
Scientific paper
10.1103/PhysRevB.72.165338
The persistent current is here studied in one-dimensional disordered rings that contain interacting electrons. We used the density matrix renormalization group algorithms in order to compute the stiffness, a measure that gives the magnitude of the persistent currents as a function of the boundary conditions for different sets of both interaction and disorder characteristics. In contrast to its non-interacting value, an increase in the stiffness parameter was observed for systems at and off half-filling for weak interactions and non-zero disorders. Within the strong interaction limit, the decrease in stiffness depends on the filling and an analytical approach is developed to recover the observed behaviors. This is required in order to understand its mechanisms. Finally, the study of the localization length confirms the enhancement of the persistent current for moderate interactions when disorders are present at half-filling. Our results reveal two different regimes, one for weak and one for strong interactions at and off half-filling.
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