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Cited by 111Superconducting and THz Device TechnologyPhysics of Superconductivity and MagnetismNonlinear Dynamics and Pattern Formation

Phase dynamics in a stack of inductively coupled intrinsic Josephson junctions and terahertz electromagnetic radiation

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Hu, Xiao, Lin, Shi-Zeng·2010·Superconductor Science and Technology
DOI 10.1088/0953-2048/23/5/053001
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Abstract

The Josephson effect is a phenomenon of current flow across two weakly linked superconductors separated by a thin barrier, i.e. a Josephson junction, associated with coherent quantum tunneling of Cooper pairs. Many novel phenomena appear due to the nonlinear property of the Josephson effect, such as Shapiro steps in dc current–voltage ( IV ) characteristics of a Josephson junction under microwave irradiation, which can be used as a voltage standard. The Josephson effect also provides a unique way to generate high-frequency electromagnetic (EM) radiation by dc bias voltage as the inverse process of the Shapiro step. The discovery of cuprate high- T c superconductors accelerated the effort to develop novel sources of EM waves based on a stack of atomically densely packed intrinsic Josephson junctions (IJJs), since the large superconductivity gap covers the whole terahertz (THz) frequency band. Very recently, strong and coherent THz radiation has been successfully generated from a mesa structure of a Bi 2 Sr 2 CaCu 2 O 8 + δ single crystal which works both as the source of energy gain and as the cavity for resonance. This experimental breakthrough posed a challenge to the theoretical study of the phase dynamics of stacked IJJs, since the phenomenon cannot be explained by the known solutions of the sine-Gordon equation so far. It is then found theoretically that, due to the huge inductive coupling of IJJs produced by the nanometer junction separation and the large London penetration depth of the order of micrometers of the material, a novel dynamic state is stabilized in the coupled sine-Gordon system, in which ± π kinks are developed in the superconductivity phase difference responding to the standing wave of the Josephson plasma and are stacked alternately in the c axis. This novel solution of the inductively coupled sine-Gordon equations captures the important features of experimental observations. The theory predicts an optimal radiation power larger than the one observed in recent experiments by orders of magnitude, and thus suggests the technological relevance of the phenomena.

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  • High-Tc cuprates can emit THz radiation under bias due to tunneling of Cooper pairs through intrinsic Josephson junctions between superconducting CuO2 layers and insulating BiO/SrO barrier layers, as occurs in Bi-2212.

    “high- cuprates can likewise emit THz radiation under bias due to tunneling of Cooper pairs through the intrinsic Josephson junctions that develop between superconducting CuO2 layers and insulating BiO/SrO barrier layers, as occurs naturally within Bi2Sr2CaCu2O8+x (Bi-2212)67,68.”

    From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [67]

    The Introduction (p. 2) describes Cooper-pair tunneling across Josephson junctions and reports THz emission from voltage-biased BSCCO. Section III.1 (p. 17) places superconductivity mainly in CuO layers and describes the layered crystal as a stack of Josephson junctions. Our copy does not identify the insulating barriers specifically as BiO/SrO layers, so that structural detail is not supported. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

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Research works printed but not linked: 17

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  11. [120]120. S. Z. Lin, and X. Hu, "Kink State in a Stack of Intrinsic Josephson Junctions in Layered HighT c Superconductors and Terahertz Radiation," arXiv:0905.2486(to be published in Journal of Superconductivity and Novel Magnetism) (2009). · arXiv
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Authors
Hu, X., & Lin, S.-Z.
Affiliations
National Institute for Materials Science (JP)
Venue
Superconductor Science and Technology
Publisher
IOP Publishing
Published
2010-04-19
Volume
23
Issue
5
Pages
053001
ISSN
  • 0953-2048 (ISSN-L)
  • 1361-6668
DOI
10.1088/0953-2048/23/5/053001
OpenAlex
W1975877596
Cited by
111
References
159
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 3 · 2020: 4 · 2019: 5 · 2018: 3 · 2017: 6 · 2016: 7 · 2015: 9 · 2014: 3 · 2013: 20 · 2012: 18
FWCI
9.83
Type
journal article
Language
en
Open access
Locations
  • Superconductor Science and Technology (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Superconducting and THz Device Technology
  • Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Physics of Superconductivity and Magnetism
  • Physical Sciences › Computer Science › Computer Networks and Communications › Nonlinear Dynamics and Pattern Formation
Keywords
intrinsic Josephson junctions, terahertz radiation, phase dynamics, inductive coupling, sine-Gordon equation, kinks, Josephson plasma, Bi2Sr2CaCu2O8+δ, cuprate superconductors, terahertz sources, London penetration depth, radiated power

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