Phys. Rev. Lett. 64, 962–965 (1990)Calculation of giant fractional Shapiro steps in Josephson-junction arraysSee Also: Erratum Received 11 December 1989; published in the issue dated 19 February 1990 We calculate the rsponse of an N×N array of resistively shunted Josephson junctions to an imposed current I=Idc+Iacsin(2πνt). In a transverse dc magnetic field of p/q==f flux quanta per plaquette of area, we find fractional giant Shapiro steps in the time-averaged voltage 〈V〉 at values 〈V〉=nNhν/2eq, n=1,2,3,..., in agreement with the measurements of Benz et al. At f=1/5, 2/5, and 1/3, we find additional fractional steps at 〈V〉=Nhν/(4e). A generalization of the model of Benz et al. accounts for both the fractional giant steps at p/q and the anomalous half-integer steps. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.962
DOI:
10.1103/PhysRevLett.64.962
PACS:
74.50.+r, 74.40.+k, 74.60.Ge, 74.60.Jg
See AlsoErratum: K. H. Lee, D. Stroud, and J. S. Chung, Calculation of Giant Fractional Shapiro Steps in Josephson-Junction Arrays, Phys. Rev. Lett. 65, 668 (1990). |
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