Friedel oscillations of the magnetic field penetration in systems with spatial quantization

The magnetic field, applied to a size-quantized system produces equilibrium persistent current non-uniformly distributed across the system. The distributions of dia- and paramagnetic currents and magnetic field in a quantum well is found. We discuss the possibility of observation of field distribution by means of NMR.Comment: 4 pages, 1 figure, uses nanosymp.sty. Accepted for 10th International Symposium "Nanostructures: Physics and Technology", St Petersburg, Russia, June 17-21(2002). The extended version, including the case of strip geometry submitted to "JETP Letters