Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack

I. Martin; Gábor B. Halász; L. N. Bulaevskii; A. E. Koshelev

doi:10.1063/1.3467962

Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack

I. Martin, Gábor B. Halász, L. N. Bulaevskii, A. E. Koshelev

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We show that a shunt capacitor, by coupling each Josephson junction to all the other junctions, stabilizes synchronized oscillations in an intrinsic Josephson junction stack biased by a dc current. This synchronization mechanism is similar to the previously discussed radiative coupling between junctions, however, it is not defined by the geometry of the stack. It is particularly important in crystals with smaller numbers of junctions (where the radiation coupling is weak), and is comparable with the effect of strong super-radiation in crystals with many junctions. The shunt also helps to enter the phase-locked regime in the beginning of the oscillations, after switching on the bias current. Furthermore, it may be used to tune radiation power, which drops as the shunt capacitance increases.

Original language	English
Article number	033908
Journal	Journal of Applied Physics
Volume	108
Issue number	3
DOIs	https://doi.org/10.1063/1.3467962
State	Published - Aug 1 2010
Externally published	Yes

Funding

The work of I.M. and L.N.B. was carried out under the auspices of the National Nuclear Security Administration of the U.S. Department of Energy at Los Alamos National Laboratory under Contract No. DE-AC52-06NA25396 and supported by the LANL/LDRD Program. The work of A.K. was supported by the U.S. Department of Energy under the Contract No. DE-AC02-06CH11357 (ANL). I.M. and L.N.B. were supported in part by the National Science Foundation under Grant No. PHY05-51164. G.B.H. acknowledges Professor J. Driscoll of Trinity College, Cambridge, for supporting this research.

Funders	Funder number
National Science Foundation	PHY05-51164
U.S. Department of Energy
National Nuclear Security Administration
Argonne National Laboratory
Laboratory Directed Research and Development	DE-AC02-06CH11357
Los Alamos National Laboratory	DE-AC52-06NA25396

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N2 - We show that a shunt capacitor, by coupling each Josephson junction to all the other junctions, stabilizes synchronized oscillations in an intrinsic Josephson junction stack biased by a dc current. This synchronization mechanism is similar to the previously discussed radiative coupling between junctions, however, it is not defined by the geometry of the stack. It is particularly important in crystals with smaller numbers of junctions (where the radiation coupling is weak), and is comparable with the effect of strong super-radiation in crystals with many junctions. The shunt also helps to enter the phase-locked regime in the beginning of the oscillations, after switching on the bias current. Furthermore, it may be used to tune radiation power, which drops as the shunt capacitance increases.

AB - We show that a shunt capacitor, by coupling each Josephson junction to all the other junctions, stabilizes synchronized oscillations in an intrinsic Josephson junction stack biased by a dc current. This synchronization mechanism is similar to the previously discussed radiative coupling between junctions, however, it is not defined by the geometry of the stack. It is particularly important in crystals with smaller numbers of junctions (where the radiation coupling is weak), and is comparable with the effect of strong super-radiation in crystals with many junctions. The shunt also helps to enter the phase-locked regime in the beginning of the oscillations, after switching on the bias current. Furthermore, it may be used to tune radiation power, which drops as the shunt capacitance increases.

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Shunt-capacitor-assisted synchronization of oscillations in intrinsic Josephson junctions stack

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