Persistent currents in a one-dimensional ring for a disordered Hubbard model
- 15 April 1995
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 51 (16) , 10915-10922
- https://doi.org/10.1103/physrevb.51.10915
Abstract
We consider a one-dimensional Hubbard model in the presence of disorder. We compute the charge stiffness for a mesoscopic ring as a function of the size L, which is a measure of the persistent currents. We find that for finite disorder the persistent currents of the system with repulsive interactions are larger than those of the system with attractive interactions. This counterintuitive result is due to the fact that local-density fluctuations are reduced in the presence of repulsive interactions.Keywords
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