H/2E OSCILLATIONS FOR CORRELATED ELECTRON PAIRS IN DISORDERED MESOSCOPIC RINGS

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 h/2e-periodic energy levels whose eigenfunctions exhibit a airing effect. This represents the first direct observation of interaction-assisted coherent pair propagation. Shape and number of the pair states are consistent with our previous transfer matrix study.