Fiske steps and Abrikosov vortices in Josephson tunnel junctions

Lisitskiy, M.; Fistul, M. V.

doi:10.1103/physrevb.81.184505

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…( 21). Figure 2 shows the dc Josephson current density induced by the Fiske resonance as a function of the dc voltage 26) and ω L = c FI π/L. φ is fixed as n/2 in the F n (φ) function.…”

Section: Resultsmentioning

confidence: 99%

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Composite Excitation of Josephson Phase and Spin Waves in Josephson Junctions with Ferromagnetic Insulator

et al. 2011

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Coupling of Josephson-phase and spin-waves is theoretically studied in a superconductor/ferromagnetic insulator/ superconductor (S/FI/S) junction. Electromagnetic (EM) field inside the junction and the Josephson current coupled with spin-waves in FI are calculated by combining Maxwell and Landau-Lifshitz-Gilbert equations. In the S/FI/S junction, it is found that the current-voltage (I-V ) characteristic shows two resonant peaks for each mode of the EM field. Voltages at the resonant peaks are obtained as a function of the normal modes of EM field, which indicates a composite excitation of the EM field and spin-waves in the S/FI/S junction. We also examine another type of junction, in which a nonmagnetic insulator (I) is located at one of interfaces between S and FI. In such a S/I/FI/S junction, three resonant peaks appear in the I-V curve, since the Josephson-phase couples to the EM field in the I layer.

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Section: Resultsmentioning

confidence: 99%

“…Figure 3 shows a V 0 -n curves obtained by eq. (26). The vertical axis is the dc voltage normalized by !…”

Section: Resultsmentioning

confidence: 99%

Composite Excitation of Josephson Phase and Spin Waves in Josephson Junctions with Ferromagnetic Insulator

et al. 2011

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“…Instead of that I used the method of averaging elaborated previously in Ref. [1,14]. In this a strongly non-linear regime the I-V curve is described by Eqs.…”

Section: Discussionmentioning

confidence: 99%

“…Instead of the perturbation approach I will use the method of averaging elaborated in Refs. [1,14]. Although this method has been used, previously, in order to analyze the current resonances in long Josephson junctions with randomly distributed Abrikosov vortices, i.e.…”

Section: Introductionmentioning

confidence: 99%

Josephson phase diffusion in small Josephson junctions: a strongly nonlinear regime

Fistul¹

2016

No-Nonsense Physicist

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I present a theoretical study of current-voltage characteristics (I-V curves ) of small Josephson junctions. In the limit of a small Josephson coupling energy EJ ≪ kBT the thermal fluctuations result in a stochastic dependence of the Josephson phase ϕ on time, i.e the Josephson phase diffusion. These thermal fluctuations destroy the superconducting state, and the low-voltage resistive state is characterized by a nonlinear I-V curve. Such I-V curve is determined by the resonant interaction of ac Josephson current with the Josephson phase oscillations excited in the junction. The main frequency of ac Josephson current is ω = eV / , where V is the voltage drop on the junction. In the phase diffusion regime the Josephson phase oscillations show a broad spectrum of frequencies.The average I-V curve is determined by the time-dependent correlations of the Josephson phase. By making use of the method of averaging elaborated in Ref. [1] for Josephson junctions with randomly distributed Abrikosov vortices I will be able to obtain two regimes: a linear regime as the amplitudes of excited phase oscillations are small, and a strongly nonlinear regime as both the amplitudes of excited Josephson phase oscillations and the strength of resonant interaction are large. The latter regime can be realized in the case of low dissipation. The crossover between these regimes is analyzed.PACS numbers:

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Rectification by an Imprinted Phase in a Josephson Junction

et al. 2011

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A Josephson phase shift can be induced in a Josephson junction by a strategically nearby pinned Abrikosov vortex (AV). For an asymmetric distribution of imprinted phase along the junction (controlled by the position of the AV) such a simple system is capable of rectification of ac current in a broad and tunable frequency range. The resulting rectified voltage is a consequence of the directed motion of a Josephson antivortex which forms a pair with the AV when at local equilibrium. The proposed realization of the ratchet potential by imprinted phase is more efficient than the asymmetric geometry of the junction itself, it is easily realizable experimentally, and provides rectification even in the absence of applied magnetic field.PACS numbers: 74.50.+r,74.45.+c, 74.78.Na, 74.25.Fy, 74.20.De Starting from the discovery of biological molecular motors [1], the ratchet effect has been demonstrated in many different physical systems, where rectification in the presence of external random or periodic forces with zero time average is induced by means of spatial or temporal asymmetries (see Ref.[2] for a review). Among other solid-state ratchet systems, superconducting ratchets have been realized -based on Abrikosov vortices [3]. Josephson vortex ratchets were also studied, in long Josephson junctions (JJs) [4][5][6] and in specially engineered JJ arrays [7]. Voltage rectification based on the Josephson phase change has been demonstrated in asymmetric [8,9] and three-junction SQUIDs [10,11], and in annular JJs [12] with the asymmetric potential created by junction design, by inhomogeneous magnetic field [5] or by extra current biasing [6]. Josephson ratchets based on asymmetry of the drive rather than the potential itself have also been realized [13,14]. The nonlinear signal mixing of two driving forces was also shown to be capable to control transport in different deterministic and Brownian ratchet devices [15,16].In this Letter, we propose a ratchet based on an inhomogeneous phase change along the planar JJ. The simplest practical realization of such phase distribution can be realized by pinning an Abrikosov vortex (AV) nearby the junction (see Fig. 1). An AV can be inserted into the sample, e.g., by field cooling [17], or by passing a large bias current through the system [18]. Once in the system, the location of the AV can be controlled by e.g. appropriately directed transport current [17]. However, such current would affect the JJ as well. A more elegant way of nucleating, as well as manipulating the AV is through the use of an electron beam, demonstrated experimentally by Ustinov et al. [19]. Here, we keep the AV from penetrating into the junction, since its magnetic field is known to strongly alter the properties of the junction [20].Our idea is fairly simple. In the presence of an applied ac current, an off-center location of the AV creates an asymmetric phase imprint on the junction and, consequently, an asymmetric potential for the motion of a Josephson fluxon along the junction. This in turn generates a net...

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Fiske steps and Abrikosov vortices in Josephson tunnel junctions

Abstract: We present a theoretical and experimental study of the Fiske resonances in the current-voltage

Cited by 6 publications

References 28 publications

Composite Excitation of Josephson Phase and Spin Waves in Josephson Junctions with Ferromagnetic Insulator

Composite Excitation of Josephson Phase and Spin Waves in Josephson Junctions with Ferromagnetic Insulator

Josephson phase diffusion in small Josephson junctions: a strongly nonlinear regime

Rectification by an Imprinted Phase in a Josephson Junction

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