Charge-imbalance effects in intrinsic Josephson systems

Rother, S.; Koval, Y.; Müller, Paul; Kleiner, R.; Ryndyk, Dmitry A.; Keller, J.; Helm, Ch.

doi:10.1103/physrevb.67.024510

Cited by 29 publications

(38 citation statements)

References 21 publications

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“…However, non-equilibrium QPs would produce V det that depends on the charge of injected QPs (electrons or holes), that is, on the direction of the injection current in the generator. Such non-even current response has been observed in previous works with a detector intimately connected with the generator 18 34 (see also a description of the QP signal in Methods). In contrast, in our experiment the detector and the generator are well separated and the detected signal is independent from the bias direction in the generator, as shown in Fig.…”

Section: Discussionsupporting

confidence: 70%

Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy

2013

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Understanding the pairing mechanism that gives rise to high-temperature superconductivity is one of the longest-standing problems of condensed-matter physics. Almost three decades after its discovery, even the question of whether or not phonons are involved remains a point of contention to some. Here we describe a technique for determining the spectra of bosons generated during the formation of Cooper pairs on recombination of hot electrons as they tunnel between the layers of a cuprate superconductor. The results obtained indicate that the bosons that mediate pairing decay over micrometre-scale distances and picosecond timescales, implying that they propagate at a speed of around 10 6 m s À 1 . This value is more than two orders of magnitude greater than the phonon propagation speed but close to Fermi velocity for electrons, suggesting that the pairing mechanism is mediated by unconventional repulsive electron-electron, rather than attractive electron-phonon, interactions.

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Section: Discussionsupporting

confidence: 70%

Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy

2013

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“…(10), a capacitive coupling [39,40] and a coupling originating from non-equilibrium effects [41,42] are also present in intrinsic Josephson junctions. These two couplings are weak in comparison to the inductive coupling and are neglected in the present work.…”

Section: Lagrangian and Model Equationmentioning

confidence: 99%

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Lin

2009

Phys. Rev. B

174

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We present a theoretical description of the phase dynamics and its corresponding electrodynamics in a stack of inductively coupled intrinsic Josephson junctions of layered high-Tc superconductors in the absence of an external magnetic field. Depending on the spatial structure of the gauge invariant phase difference, the dynamic state is classified into: state with kink, state without kink, and state with solitons. It is revealed that in the state with phase kink, the plasma is coupled to the cavity and the plasma oscillation is enhanced. In contrast, in the state without kink, the plasma oscillation is weak. It points a way to enhance the radiation of electromagnetic from high-Tc superconductors. We also perform numerical simulations to check the theory and a good agreement is achieved. The radiation pattern of the state with and without kink is calculated, which may serve as a fingerprint of the dynamic state realized by the system. At last, the power radiation of the state with solitons is calculated by simulations. The possible state realized in the recent experiments is discussed in the viewpoint of the theoretical description. The state with kink is important for applications including terahertz generators and amplifiers.

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“…Here, we neglect this effect, and assume it to be weak, in agreement with experiments. 17 For the parameters corresponding to the Bi 2 Sr 2 CaCu 2 O 8+␦ compounds, the spectrum of symmetric quasilinear waves is located close to the "vacuum light line," = ck, and deviates from this line only at very small values of 1 − ⍀ 2 ϳ ab 2 / ⑀ c 2 . Thus, these waves are unlikely to be excited in Bi 2 Sr 2 CaCu 2 O 8+␦ compounds.…”

Section: B Quasilinear Wavesmentioning

confidence: 87%

Layered superconductors as nonlinear waveguides for terahertz waves

et al. 2007

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We show that unusual nonlinear self-sustained waves, called nonlinear waveguide modes ͑NWGMs͒, can propagate along thin slabs of layered superconductors. We show that these waves are stable in the main approximation for extremely anisotropic superconductors if the nonlinear wave amplitude is smaller than a critical value. These modes have no analogs among linear Josephson plasma waves and do not exist in thick samples. The magnetic field of the NWGM is distributed symmetrically with respect to the middle of the slab, decays far from the sample, and can change its sign inside. The impedance ratio of the tangential electric-and magnetic-field amplitudes for NWGMs can be of the order of unity, resulting in a nonmonotonic dispersion relation, ͑k͒, strongly sensitive to the NWGM amplitudes. Thus, the "stopping light" phenomenon, now controlled by the magnetic-field amplitude, can be observed. Resonance excitations of the NWGMs should produce anomalies in the amplitude dependence of the reflectivity and transmissivity of the incident terahertz waves, which could be useful for terahertz devices.The Maxwell equations for EMWs in vacuum ͑z Ͼ d /2͒ determine the distributions of the magnetic ͑directed along the y axis͒ and electric fields,also,with the spatial decrement q v = ͱ k 2 − 2 / c 2 . The impedance ratio, PHYSICAL REVIEW B 75, 184503 ͑2007͒

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Charge-imbalance effects in intrinsic Josephson systems

Cited by 29 publications

References 21 publications

Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy

Signatures of the electronic nature of pairing in high-Tc superconductors obtained by non-equilibrium boson spectroscopy

Phase dynamics in intrinsic Josephson junctions and their electrodynamics

Layered superconductors as nonlinear waveguides for terahertz waves

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