Abstract
We present a microscopic calculation of the disorder-averaged persistent current for a mesoscopic ring with a fixed number of electrons. Using an idea by Imry, we show that the event Fourier components of the average current dominate and are related to the typical single-level current D ∞ D/0 , which can be calculated by a Green's-function-averaging technique. For the small even harmonics p, the result simplifies to D ∼I 0 /2πM, where M is the number of transverse channels. Its relevance to multiring experiments is discussed
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