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VOLUME 58 | ISSUE 10 | PAGE 796
Charge currents of spin excitations in one-dimensional Hubbard model
The current-carrying states in a one-dimensional system of interacting electrons are considered. The new exact results for the Hubbard model and for the bosonization method are used. Away from half filling both spin and charge excitations were found to carry currents which are proportional to their momenta for most cases. Being in a qualitative agreement with a single-particle picture of the noninteracting ID Fermi gas, this result contradicts the spin-charge separation concept, since it is usually derived, e.g., from the bosonization approach or in strong repulsion picture. The paradox can be resolved by taking into account the spectrum parabolicity and re-examining the structure of the current operator within the bosonization approach.

Permission given by American Institute of Physics is appreciated.