Fractional giant Shapiro resonances in frustrated systems driven by a time-dependent flux
Department of Physics and Center for Theoretical Physics,
University - Seoul 151-742, Korea
Accepted: 3 July 1996
We examine the response of a two-dimensional cylindrical array of Josephson junctions to a time-dependent Aharonov-Bohm flux, which can be mapped to tight-binding electrons in the same geometry. It is shown that a non-vanishing time-average of the persistent current is developed whenever the dc component of the flux is properly quantized, leading to giant Shapiro resonances. Here a perpendicular magnetic field is found to yield novel fractional resonances in addition to the integer ones. In particular, the topological origin of such integer and fractional quantization is pointed out.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 72.15.Gd – Galvanomagnetic and other magnetotransport effects
© EDP Sciences, 1996