Exchange coupling in quantum rings and wires in the Wigner-crystal limit
نویسندگان
چکیده
We present a controlled method for computing the exchange coupling in strongly correlated onedimensional electron systems. The asymptotically exact relation between the exchange constant and the pair-correlation function of spinless electrons is derived. Explicit results are obtained for thin quantum rings with realistic Coulomb interactions, by calculating this function via a many-body instanton approach.
منابع مشابه
Spin exchange in quantum rings and wires in the Wigner-crystal limit
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 paircorrelation function of spinless electrons. Explicit results are obtained for thin quantum rings with realistic Coulomb interactions, by calculating this function via a many-body ins...
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