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We consider the unfolded spectra of disordered systems with the topology of a ring, in the presence of an Aharonov-Bohm flux. We study the flux dependence of a single energy level. We find that the correlator of the derivatives at two different fluxes has a universal functional form, and propose that the result is valid for all systems with Wigner-Dyson statistics.
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Szafer et al. (1993) studied this question.
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