About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
Publication
Physical Review Letters
Paper
Persistent differences between canonical and grand canonical averages in mesoscopic ensembles: Large paramagnetic orbital susceptibilities
Abstract
Disorder-averaged thermodynamic quantities within the canonical ensemble are expressed in terms of fluctuations in the grand canonical ensemble, and are then evaluated for the diffusive regime. The particular example of persistent currents in Aharanov-Bohm geometries is addressed, and the harmonics of the disorder-averaged current (which is 1/20 periodic) are obtained. The orbital susceptibility of a mesoscopic system, disorder averaged over the canonical ensemble, may be large and positive, even for systems which, on a larger scale, should exhibit Landau diamagnetism. © 1991 The American Physical Society.