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The superconductor to insulator transition is studied in a self-chargingmodel for a ladder of Josephson-junctions in presence of an external magneticfield. Path integral Monte Carlo simulations of the equivalent(1+1)-dimensional classical model are used to study the phase diagram andcritical behavior. In addition to a superconducting (vortex-free) phase, avortex phase can also occur for increasing magnetic field and small chargingenergy. It is found that an intervening insulating phase separates thesuperconducting from the vortex phases. Surprisingly, a finite-size scalinganalysis shows that the field-induced superconducting to insulator transitionis in the KT universality class even tough the external field breakstime-reversal symmetry.Comment: 5 pages, 7 figures, to appear in Phys. Rev.

Field-induced superconductor-to-insulator transition in Josephson-junction ladders