Influence of spin on the persistent current of strongly interacting electrons

Details Influence of spin on the persistent current of strongly interacting electrons Influence of spin on the persistent current of strongly interacting electrons

1996-02-14

arxiv.org/abs/cond-mat/9602082v1

Physica B 222, 43 (1996)

Physics

Condensed Matter

Latex file, 15 pages, 13 figures available in uuencoded PostScript from the author

Scientific paper

10.1016/0921-4526(96)00228-1

The lowest eigenenergies of few, strongly interacting electrons in a one--dimensional ring are studied in the presence of an impurity barrier. The persistent current $\:I\:$, periodic in an Aharonov--Bohm flux penetrating the ring, is strongly influenced by the electron spin. The impurity does not remove discontinuities in $\:I\:$ at zero temperature. The total electron spin of the ground state oscillates with the flux. Strong electron--electron interaction enhances $\:I\:$, albeit not up to the value of the clean ring which itself is smaller than $\:I\:$ for free electrons. $\:I\:$ disappears on a temperature scale that depends exponentially on the electron density. In the limit of very strong interaction the response to small fluxes is diamagnetic.

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