$h/2e$--Oscillations for Correlated Electron Pairs in Disordered Mesoscopic Rings

Details $h/2e$--Oscillations for Correlated Electron Pairs in Disordered Mesoscopic Rings $h/2e$--Oscillations for Correlated Electron Pairs in Disordered Mesoscopic Rings

1995-03-21

arxiv.org/abs/cond-mat/9503120v1

Phys. Rev. Lett. 75 1995 1598

Physics

Condensed Matter

4 pages, uuencoded PostScript, containing 5 figures.

Scientific paper

10.1103/PhysRevLett.75.1598

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 $L_1$ 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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