Persistent Currents in Interacting Systems: Role of the Spin

Details Persistent Currents in Interacting Systems: Role of the Spin Persistent Currents in Interacting Systems: Role of the Spin

1995-12-22

arxiv.org/abs/cond-mat/9512153v1

Physics

Condensed Matter

Latex file (5 pages), 7 postscript figures in uuencoded format included

Scientific paper

Persistent currents flowing through disordered mesoscopic rings threaded by a magnetic flux are investigated. Models of fermions with on-site interactions (Hubbard model) or models of spinless fermions with nearest neighbor interactions are considered on 2D cylinders with twisted boundary conditions in one direction to account for a magnetic flux. Self-consistent Hartree-Fock methods are used to treat the electron-electron interaction beyond first order. We show that the second harmonic of the current (which is relevant in the diffusive regime) is {\it strongly suppressed} by the interaction in the case of spinless fermions while it is {\it significantly enhanced} in the Hubbard model. Our data also strongly suggest that the reduction (increase) of this harmonic is related to a strong increase (reduction) of the spacial fluctuations of the charge density.

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