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  Parametrically amplified phase-incoherent superconductivity in YBa2Cu3O6+x

von Hoegen, A., Fechner, M., Först, M., Porras, J., Keimer, B., Michael, M., et al. (2020). Parametrically amplified phase-incoherent superconductivity in YBa2Cu3O6+x.

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1911.08284.pdf (Preprint), 8MB
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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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 Abstract: The possibility of enhancing desirable functional properties of complex materials by optical driving is motivating a series of studies of their nonlinear terahertz response. In high-Tc cuprates, large amplitude excitation of certain infrared-active lattice vibrations has been shown to induce transient features in the reflectivity suggestive of non-equilibrium superconductivity. Yet, a microscopic mechanism for these observations is still lacking. Here, we report measurements of time- and scattering-angle-dependent second-harmonic generation in YBa2Cu3O6+x, taken under the same excitation conditions that result in superconductor-like terahertz reflectivity. We discover a three-order-of-magnitude amplification of a 2.5-terahertz electronic mode, which is unique because of its symmetry, momentum, and temperature dependence. A theory for parametric three-wave amplification of Josephson plasmons, which are assumed to be well-formed below Tc but overdamped throughout the pseudogap phase, explains all these observations and provides a mechanism for non-equilibrium superconductivity. More broadly, our work underscores the role of parametric mode mixing to stabilize fluctuating orders in quantum materials.

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Language(s): eng - English
 Dates: 2020-11-16
 Publication Status: Published online
 Pages: 56
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 1911.08284
 Degree: -

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