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We consider s=1/2 spins in the presence of a constant magnetic field inz-direction and an AC magnetic field in the x-z plane. A nonzero DCmagnetization component in y direction is a result of broken symmetries. Apairwise interaction between two spins is shown to resonantly increase theinduced magnetization by one order of magnitude. We discuss the mechanism ofthis enhancement, which is due to additional avoided crossings in the levelstructure of the system.Comment: 7 pages, 7 figure

ac-driven quantum spins: Resonant enhancement of transverse dc magnetization