%0 Unpublished Work %A Kusmartsev, Feodor %D 2006 %T Enhancement of persistent current on multichannel ring %U https://repository.lboro.ac.uk/articles/preprint/Enhancement_of_persistent_current_on_multichannel_ring/9409172 %2 https://repository.lboro.ac.uk/ndownloader/files/17026577 %K untagged %K Physical Sciences not elsewhere classified %X We describe a "train" effect which may exist in small metallic and semiconductor rings and might be associated with the long-standing problem of the persistent current enhancement. The current is associated with the cooperative motion of N electrons constituing the N-electron "train". The train arises via an excitation or a backflow of spin waves or of interchannel charge density sound modes. The impurities and defects have a little effect on the "train" current. The reason is that the "train" current is associated with a small momentum transfer, which is much smaller than the momentum transfer of the free electron current equal to 2 pi/L. For an illustration of the "train" effect we have calculated the persistent current in the framework of the Bethe ansatz solutions for Hubbard model. The fractional M/N periodicities of the persistent current serve as an indication of the electron "train". %I Loughborough University