Nonideal artificial phase discontinuity in long Josephson<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>0</mml:mn><mml:mtext>−</mml:mtext><mml:mi>κ</mml:mi></mml:mrow></mml:math>junctions

Gaber, T.; Goldobin, E.; Sterck, A.; Kleiner, R.; Koelle, D.; Siegel, M.; Neuhaus, M.

doi:10.1103/physrevb.72.054522

Cited by 26 publications

(27 citation statements)

References 34 publications

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“…A similar effect takes place in Josephson junctions with the current injectors acting as an effective source of the phase jumps along the junction (see Refs. [14][15][16] and references therein). One can also obtain a ϕ 0 JJ, where the ground state phase φ = ϕ 0 is not degenerate, e.g., using the JJs with broken inversion symmetry [17].…”

Section: Introductionmentioning

confidence: 99%

“…Such current induces the nonuniform Josephson phase difference along the junction and thus modifies its ground state. The straightforward way to realize this scenario is to implant a pair of tiny current injectors serving as a source and drain [14,15,28,29]. In this case the Josephson phase along the junction reveals a jump with the amplitude determined by the value of the injected current.…”

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confidence: 99%

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Anomalous Josephson effect controlled by an Abrikosov vortex

et al. 2017

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The possibility of a fast and precise Abrikosov vortex manipulation by a focused laser beam opens the way to create laser-driven Josephson junctions. We theoretically demonstrate that a vortex pinned in the vicinity of the Josephson junction generates an arbitrary ground state phase which can be equal not only to 0 or π but to any desired ϕ 0 value in between. Such ϕ 0 junctions have many peculiar properties and may be effectively controlled by the optically driven Abrikosov vortex. Also we theoretically show that the Josephson junction with the embedded vortex can serve as an ultrafast memory cell operating at sub THz frequencies. I. INTRODUCTIONJosephson junctions (JJs) with nonzero spontaneous phase difference between the superconducting electrodes in the ground state (the so-called π , ϕ 0 , and ϕ JJs) have become the subject of intensive theoretical and experimental study during the past decade [1,2]. The most striking feature of such junctions is their ability to generate a current in the superconducting circuit, thus acting as a phase battery [3][4][5][6]. In addition, relatively small variation of the system parameters may provoke dramatic changes in the ground state phase difference, which is believed to provide new effective tools for controlling the currents in microelectronic devices (see, e.g., Refs. [7,8]).There are several generic mechanisms leading to the spontaneous appearance of nonzero Josephson phase. The basic one reveals when the superconducting (S) electrodes are separated by a ferromagnetic (F) layer. The exchange field inside the ferromagnet produces the spatial oscillations of the Cooper pair wave function, and depending on the ratio between the oscillation period and the F-layer thickness the ground state phase is equal to 0 or π (these cases are referred as 0 or π JJs, respectively) [9][10][11]. A peculiar situation is realized when the thickness d of the ferromagnet varies along the junction in a way that in some parts of the ferromagnet the value of d corresponds to the 0 state while in other parts to the π state (see Ref. [12] and references therein). If there is only a slight difference between the areas of the "0" and "π " regions the phase frustration can result in the appearance of a state with the spontaneous phase difference φ = ±ϕ = 0,π which is degenerate (ϕ JJ) (see Ref.[13] and references therein). A similar effect takes place in Josephson junctions with the current injectors acting as an effective source of the phase jumps along the junction (see and references therein). One can also obtain a ϕ 0 JJ, where the ground state phase φ = ϕ 0 is not degenerate, e.g., using the JJs with broken inversion symmetry [17]. In this case the superconducting current I through the junction should not be necessarily an odd function of the phase difference φ and can take the form I = I c sin(φ + ϕ 0 ) [17]. Such situation is realized in the S|F|S junctions with strong spin-orbit coupling (see and references therein) or complicated noncollinear distribution of the magnetization (see an...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Anomalous Josephson effect controlled by an Abrikosov vortex

et al. 2017

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“…Note that the γ c (+κ, − κ) curve is identical to the γ c (κ) dependence of a linear LJJ of length l/2 with a single central vortex. 39 As already mentioned in Sec. II B, the AFM molecule exhibits regions of bistability of the direct and the complementary vortex states around |κ| = (2n + 1)π .…”

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confidence: 69%

“…5(d)]. In the AFM configuration, the γ c (+κ, − κ) pattern sensitively depends on junction length as well as on injector size: 39 For infinitesimally small injectors, the γ c (+κ, − κ) is 2π periodic with maxima at κ = 2πn and minima at κ = (2n + 1)π . For finite-size injectors, however, this is not the case: γ c (±2πn, ∓ 2πn) < γ c (0,0) and the minimum positions shift to κ > (2n + 1)π .…”

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Spectroscopy of a fractional Josephson vortex molecule

et al. 2012

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In long Josephson junctions with multiple discontinuities of the Josephson phase, fractional vortex molecules are spontaneously formed. At each discontinuity point a fractional Josephson vortex carrying a magnetic flux $|\Phi|<\Phi_0$, $\Phi_0\approx 2.07\times 10^{-15}$ Wb being the magnetic flux quantum, is pinned. Each vortex has an oscillatory eigenmode with a frequency that depends on $\Phi/\Phi_0$ and lies inside the plasma gap. We experimentally investigate the dependence of the eigenfrequencies of a two-vortex molecule on the distance between the vortices, on their topological charge $\wp=2\pi\Phi/\Phi_0$ and on the bias current $\gamma$ applied to the Josephson junction. We find that with decreasing distance between vortices, a splitting of the eigenfrequencies occurs, that corresponds to the emergence of collective oscillatory modes of both vortices. We use a resonant microwave spectroscopy technique and find good agreement between experimental results and theoretical predictions.Comment: submitted to Phys. Rev.

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“…[8][9][10] The injection contacts are at the edge x = 0 and y 1 = 0.3 and y 2 = 0.7, i.e. they are symmetric relative to the strip middle y = 1/2.…”

Section: A Symmetric Injectionmentioning

confidence: 99%

Effect of current injection into thin-film Josephson junctions

Kogan¹,

Mint︠s︡²

2014

Phys. Rev. B

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New thin-film Josephson junctions have recently been tested in which the current injected into one of the junction banks governs Josephson phenomena. One thus can continuously manage the phase distribution at the junction by changing the injected current. A method of calculating the distribution of injected currents is proposed for a half-infinite thin-film strip with source-sink points at arbitrary positions at the film edges. The strip width W is assumed small relative to ⇤ = 2 2 /d, is the bulk London penetration depth of the film material, d is the film thickness.

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Nonideal artificial phase discontinuity in long Josephson0−κjunctions

Cited by 26 publications

References 34 publications

Anomalous Josephson effect controlled by an Abrikosov vortex

Anomalous Josephson effect controlled by an Abrikosov vortex

Spectroscopy of a fractional Josephson vortex molecule

Effect of current injection into thin-film Josephson junctions

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