Hubbard ring: currents induced by change of magnetic flux
arXiv:0912.4639 · doi:10.1088/0953-8984/22/24/245301
Abstract
We investigate currents in a quantum ring threaded by a magnetic flux which can be varied in an arbitrary way from an initial value at time to a final value at time . Dynamics of electrons in the ring is described by the Hubbard and the extended Hubbard models. We demonstrate that time dependence of the induced current bears information on electron correlations. In the case of the Hubbard model with infinite on--site repulsion we prove that the current for is independent of the flux variation before . Additionally, this current is fully determined by a solution of the initial equilibrium problem and the value of . Apart from mesoscopic rings our results pose important implications for designing of quantum motors built out as the ring--shaped optical lattice.
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