Spin exchange in quantum rings and wires in the Wigner-crystal limit

Details Spin exchange in quantum rings and wires in the Wigner-crystal limit Spin exchange in quantum rings and wires in the Wigner-crystal limit

2005-04-20

arxiv.org/abs/cond-mat/0504502v4

J. Phys.: Condens. Matter 18, L7-L13 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 2 figures. Changes in the text and figures to improve readability; added references

Scientific paper

10.1088/0953-8984/18/1/L02

We present a controlled method for computing the exchange coupling in strongly correlated one-dimensional electron systems. It is based on the asymptotically exact relation between the exchange constant and the pair-correlation function of spinless electrons. Explicit results are obtained for thin quantum rings with realistic Coulomb interactions, by calculating this function via a many-body instanton approach.

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