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RESEARCH PRODUCT

Persistent Currents in Small, Imperfect Hubbard Rings

Pekka KoskinenM. Manninen

subject

PhysicsCondensed Matter - Strongly Correlated ElectronsCharacter (mathematics)Condensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsStrongly Correlated Electrons (cond-mat.str-el)Quantum dotQuantum mechanicsMesoscale and Nanoscale Physics (cond-mat.mes-hall)FOS: Physical sciencesPersistent currentImperfect

description

We have done a study with small, imperfect Hubbard rings with exact diagonalization. The results for few-electron rings show, that the imperfection, whether localized or not, nearly always decrease, but can also \emph{increase} the persistent current, depending on the character of the imperfection and the on-site interaction. The calculations are generally in agreement with more specialized studies. In most cases the electron spin plays an important role.

yearjournalcountryeditionlanguage
2003-11-04
https://dx.doi.org/10.48550/arxiv.cond-mat/0310055