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  Amplification of Superconducting Fluctuations in Driven YBa2Cu3O6+x

von Hoegen, A., Fechner, M., Först, M., Porras, J., Keimer, B., Michael, M., et al. (2022). Amplification of Superconducting Fluctuations in Driven YBa2Cu3O6+x. Physical Review X, 12(3): 031008. doi:10.1103/PhysRevX.12.031008.

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PhysRevX.12.031008.pdf (Publisher version), 2MB
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Supplemental Material: The Supplemental Materials provides detailed information about the theoretical treatment of the Josephson plasmons, ab-initio calculations of the nonlinear phonon coupling in the studied high-TC cuprates, the dependence of the amplified Josephson plasmon polariton as a function of doping, temperature, excitation frequency and excitation strength, as well as a description of the sample growth and the experimental techniques.
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https://arxiv.org/abs/1911.08284 (Preprint)
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 Creators:
von Hoegen, A.1, Author           
Fechner, M.1, Author           
Först, M.1, Author           
Porras, J.2, Author
Keimer, B.2, Author
Michael, M.3, Author
Demler, E.3, Author
Cavalleri, A.1, 4, Author           
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Max Planck Institute for Solid State Research, ou_persistent22              
3Department of Physics, Harvard University, ou_persistent22              
4Department of Physics, University of Oxford, ou_persistent22              

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Free keywords: Condensed Matter Physics, Nonlinear Dynamics, Strongly Correlated Materials
 Abstract: In cuprate high-Tc superconductors, resonant excitation of certain lattice vibrations has been shown to induce transient terahertz reflectivity features suggestive of nonequilibrium superconductivity above the critical temperature Tc. A microscopic mechanism for these observations is still lacking. Here, time-resolved measurements of scattering-angle- and polarization-dependent second-harmonic generation in driven YBa2Cu3O6+x reveal a three-order-of-magnitude amplification of a 2.5-THz electronic mode, which is unique because of its symmetry, momentum, and temperature dependence. A theory for amplification of finite-momentum Josephson plasma polaritons, which are assumed to be well formed below Tc but incoherent throughout the pseudogap phase, explains all these observations. A theoretical solution for the Fresnel-Floquet reflection that starts from the coherently oscillating Josephson plasma polaritons provides a possible mechanism for the nonequilibrium superconductorlike terahertz reflectivity reported earlier. Beyond the immediate case of cuprates, this work underscores the role of nonlinear mode mixing to amplify fluctuating modes above the transition temperature in a wide range of materials.

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Language(s): eng - English
 Dates: 2022-05-242022-03-072022-06-102022-07-13
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: arXiv: 1911.08284
DOI: 10.1103/PhysRevX.12.031008
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 12 (3) Sequence Number: 031008 Start / End Page: - Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308