An inverse ac Josephson effect voltage standard

Levinsen, Mogens T.; Chiao, Raymond Y.; Feldman, M.J.; Tucker, B.A.

doi:10.1063/1.89520

Cited by 153 publications

(61 citation statements)

References 6 publications

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“…The mechanism of the formation of ZCFFS's is close to that for the formation of zero crossing Shapiro steps 32 although in the latter case the energy of external RF radiation is involved. There is, however, an important difference between these two phenomena, consisting in the fact that unlike zero crossing Shapiro steps ZCFFS's change sign with magnetic field.…”

Section: Fig 13 Experimental Dependencies V(h)mentioning

confidence: 92%

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

1997

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Fluxon dynamics in nonuniform Josephson junctions was studied both experimentally and theoretically. Two types of nonuniform junctions were considered: the first type had a nonuniform spatial distribution of critical and bias currents and the second had a temperature gradient applied along the junction. An analytical expression for the I-V curve in the presence of a temperature gradient or spatial nonuniformity was derived. It was shown that there is no static thermomagnetic Nernst effect due to Josephson fluxon motion despite the existence of a force pushing fluxons in the direction of smaller self-energy ͑from the cold to the hot end of the junction͒. A phenomenon, the ''zero crossing flux flow step'' ͑ZCFFS͒ with a nonzero voltage at a zero applied current, was observed in nonuniform long Josephson junctions. The phenomenon is due to the existence of a preferential direction for the Josephson vortex motion. ZCFFS's were observed at certain magnetic fields when the critical current in one direction but not the other becomes zero. Possible applications of nonuniform Josephson junctions in flux flow oscillators and as a superconducting diode are discussed.

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Section: Fig 13 Experimental Dependencies V(h)mentioning

confidence: 92%

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

1997

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“…Moreover, phase-locked states of the pendulum, θ = n/m (n and m are integers), correspond to quantized values of dc voltage in the Josephson junction model. This effect, known as the inverse ac Josephson effect [6,7], has already found an application in the design of modern standard of one Volt [3,8]. Chaotic vibrational and rotational motions of underdamped pendulum, γ ≪ 1 are also well-known in Josephson junctions [9,10] (for review see [11]).…”

Section: Introductionmentioning

confidence: 99%

Symmetry breaking in a driven and strongly damped pendulum

et al. 2005

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We examine the conditions for appearance of symmetry breaking bifurcation in damped and periodically driven pendulum in the case of strong damping. We show that symmetry breaking, unlike other nonlinear phenomena, can exist at high dissipation. We prove that symmetry breaking phases exist between phases of symmetric normal and symmetric inverted oscillations. We find that symmetry broken solutions occupy a sufficiently smaller region of pendulum's parameter space in comparison to the statements made in earlier considerations [McDonald and Plischke, Phys. Rev. B 27 (1983) 201]. Our research on symmetry breaking in a strongly damped pendulum is relevant to an understanding of phenomena of dynamic symmetry breaking and rectification in a pure ac driven semiconductor superlattices.

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“…The remaining constants are a, , and e, which are the superlattice period, the reduced Planck constant, and the electron charge, respectively. This phenomena bears close resemblance to the inverse ac-Josephson effect [25,26], and is in fact just one example of similarity between Josephson junctions and ssls [27,18,28]. Unquantized spontaneous dc has also been predicted for lateral semiconductor superlattices [29,28] that only differ by their geometry from the bulk ssls studied here.…”

Section: Introductionmentioning

confidence: 78%

Rectification of terahertz radiation in semiconductor superlattices in the absence of domains

Isohätälä¹,

Alekseev²

2012

J. Phys.: Condens. Matter

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Abstract. We study theoretically the dynamical rectification of a terahertz ac electric field, i.e. the dc current and voltage response to the incident radiation, in strongly coupled semiconductor superlattices. We address the problem of stability against electric field domains: A spontaneous dc voltage is known to appear exactly for parameters for which a spatially homogeneous electron distribution is unstable. We show that by applying a weak direct current bias the rectifier can be switched from a zero dc voltage state to one with a finite voltage in full absence of domains. The switching occurs near the conditions of dynamical symmetry breaking of an unbiased semiconductor superlattice. Therefore our scheme allows for the generation of dc voltages that would otherwise be unreachable due to domain instabilities. Furthermore, for realistic, highly doped wide miniband superlattices at room temperature the generated dc field can be nearly quantized, that is, be approximately proportional to an integer multiple of ω/ea where a is the superlattice period and ω is the ac field frequency.

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An inverse ac Josephson effect voltage standard

Cited by 153 publications

References 6 publications

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

Symmetry breaking in a driven and strongly damped pendulum

Rectification of terahertz radiation in semiconductor superlattices in the absence of domains

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