N-electron train effect on the enhancement of persistent current

作者：Kusmartsev FV^*

来源：Physics Letters A, 1997, 232(1-2): 135-142.

DOI：10.1016/S0375-9601(97)00373-3

We describe a train effect which may exist in small metallic and semiconductor rings. It is associated with the cooperative motion of a ''train'' of N electrons on the ring. It may be related to the long-standing problem of the persistent current enhancement. The train arises via an excitation or a back flow of spin waves or of interchannel charge density sound modes in a multichannel ring. Disorder has little influence on the ''train'' current. We calculated the persistent current for the Hubbard model by the Bethe ansatz. The fractional M/N periodicities of the persistent current serve as an indication of the electron ''train'', where M is the number of spin-up electrons or electrons in a single channel.

• 出版日期1997-7-21