Enhanced Macroscopic Quantum Tunneling in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CaCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>8</mml:mn><mml:mo>+</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>Intrinsic Josephson-Junction Stacks

Jin, Xiao-Yong; Lisenfeld, Jürgen; Koval, Y.; Lukashenko, A.; Ustinov, A. V.; Müller, Paul

doi:10.1103/physrevlett.96.177003

Cited by 138 publications

(141 citation statements)

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“…(305), except α 0 (η), are equal to zero. In this case, the approximation of the fluxon tunnelling by the tunnelling of a single quantum particle in the effective potential well [149,160]. Using for an estimate γ = 300-500, D = 1.5 nm, we find that L c ≈ 1 µm.…”

Section: Field Tunnelling: Numerical Approachmentioning

confidence: 99%

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Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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The recent growing interest in terahertz (THz) and sub-THz science and technology is due to its many important applications in physics, astronomy, chemistry, biology, and medicine, including THz imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental control, as well as chemical and biological identification. We review the problem of linear and nonlinear THz and sub-THz Josephson plasma waves in layered superconductors and their excitations produced by moving Josephson vortices. We start by discussing the coupled sine-Gordon equations for the gauge-invariant phase difference of the order parameter in the junctions, taking into account the effect of breaking the charge neutrality, and deriving the spectrum of Josephson plasma waves.We also review surface and waveguide Josephson plasma waves. The spectrum of these waves is presented, and their excitation is discussed. We review the propagation of weakly nonlinear Josephson plasma waves below the plasma frequency, ω J , which is very unusual for plasma-like excitations.In close analogy to nonlinear optics, these waves exhibit numerous remarkable features, including a self-focusing effect, and the pumping of weaker waves by a stronger one. In addition, an unusual stop-light phenomenon, when ∂ω/∂k ≈ 0, caused by both nonlinearity and dissipation, can be observed in the Josephson plasma waves. At frequencies above ω J , the current-phase nonlinearity can be used for transforming continuous sub-THz radiation into short, strongly amplified, pulses.We also present quantum effects in layered superconductors, specifically, the problem of quantum MQT -macroscopic quantum tunnelling.z-axis is directed across the layers; y-axis is directed along the magnetic field.4

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Section: Field Tunnelling: Numerical Approachmentioning

confidence: 99%

“…In our calculations, we used the parameters of the Bi 2 Sr 2 CaCu 2 O 8+δ sample US1 from Ref. 149. The same figure shows the curve Γ(L x ) calculated using the quantum particle approach (Eq.…”

Section: Field Tunnelling: Numerical Approachmentioning

confidence: 99%

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

et al. 2010

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“…[14] for their explanation of their belief that IVC of HTSC bridge taken at millikelvin temperatures remains unaffected by heating even at P∼1kW/cm 2 . The author wishes to record his strong objection to the manner in which the reply has been edited.…”

Section: Acknowledgementmentioning

confidence: 99%

“…Moreover, the feasibility of macroscopic quantum tunnelling (MQT) was recently discussed by the authors of Refs. [13,14]. Such studies might be virtually unaffected by heating as long as they appropriately address the statistics of stochastic switching from a zero-P state.…”

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confidence: 99%

Reply to “Comment on ‘Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts’ ”

Zavaritsky

2007

Phys. Rev. B

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The recent PRB, henceforth referred as Ref. [1], experimentally resolves the intrinsic shape of the c-axis current-voltage characteristics (IVC) of HTSC and demonstrates that at sufficiently high heat loads the heating-induced IVC nonlinearities exceed the intrinsic ones so radically that the latter might be safely ignored.The author of the comment fails to take account of the experimental findings by Ref.[1] and seeks to cast doubt on all its conclusions through reference to a brush-like IVC, which is claimed to be free of heating. I will show that this claim lacks substantiation; indeed it can be stated with certainty that the IVC is not free from heating. I will further show that the data selected for this comment make it possible to explore for the first time the effect of temperature on a range of loads where the genuine response is not hidden by heating and to demonstrate for the first time that R(T ) of the same sample is responsible for a rich variety of IVC behaviours taken above and below Tc at bath temperatures spanned over 180K. Thus these data in fact provide strong novel evidence in favour of the major conclusions by Ref.[1], in particular the extrinsic cause of the key findings by intrinsic tunnelling spectroscopy.

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“…This is due to a corresponding change in the dissipative environment seen by the array. This result suggests that comparisons of macroscopic quantum tunnelling [7,8] out of the two states should reveal illuminating differences. …”

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confidence: 99%

Switchable phase diffusion in intrinsic Josephson junction arrays

Fenton

Korsah

Grovenor

et al. 2007

Physica C: Superconductivity

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We report current-voltage measurements on arrays of high-Tc intrinsic Josephson junctions showing a temperature dependence of the first critical current which is different from that of subsequent critical currents for an array with sub-micron dimensions. This can be explained by the change in the impedance seen by other array-junctions once one junction switches out of the supercurrent state, resulting in a switching-off of thermally activated phase-diffusion.

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Enhanced Macroscopic Quantum Tunneling inBi2Sr2CaCu2O8+δIntrinsic Josephson-Junction Stacks

Cited by 138 publications

References 25 publications

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

Terahertz Josephson plasma waves in layered superconductors: spectrum, generation, nonlinear and quantum phenomena

Reply to “Comment on ‘Essence of intrinsic tunneling: Distinguishing intrinsic features from artifacts’ ”

Switchable phase diffusion in intrinsic Josephson junction arrays

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