h/2e--Oscillations for Correlated Electron Pairs in Disordered Mesoscopic Rings
D. Weinmann, A. Mueller-Groeling, J. -L. Pichard, K. Frahm
Abstract
The full spectrum of two interacting electrons in a disordered mesoscopic one--dimensional ring threaded by a magnetic flux is calculated numerically. For ring sizes far exceeding the one--particle localization length L1 we find several h/2e--periodic states whose eigenfunctions exhibit a pairing effect. This represents the first direct observation of interaction--assisted coherent pair propagation, the pair being delocalized on the scale of the whole ring.
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