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  Generalized Fresnel-Floquet equations for driven quantum materials

Michael, M. H., Först, M., Nicoletti, D., Haque, S. R. U., Cavalleri, A., Averitt, R. D., et al. (2021). Generalized Fresnel-Floquet equations for driven quantum materials.

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2110.03704.pdf (Preprint), 2MB
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https://arxiv.org/abs/2110.03704 (Preprint)
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 Creators:
Michael, M. H.1, Author
Först, M.2, Author              
Nicoletti, D.2, Author              
Haque, S. R. U.3, Author
Cavalleri, A.2, 4, Author              
Averitt, R. D.3, Author
Podolsky, D.5, Author
Demler, E.1, 6, Author
Affiliations:
1Department of Physics, Harvard University, ou_persistent22              
2Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
3Department of Physics, University of California San Diego, ou_persistent22              
4Department of Physics, University of Oxford, ou_persistent22              
5Department of Physics, Technion, ou_persistent22              
6Institute for Theoretical Physics, ETH Zurich, ou_persistent22              

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Free keywords: Condensed Matter, Strongly Correlated Electrons, cond-mat.str-el, Condensed Matter, Mesoscale and Nanoscale Physics, cond-mat.mes-hall, Condensed Matter, Superconductivity, cond-mat.supr-con
 Abstract: Optical drives at terahertz and mid-infrared frequencies in quantum materials are increasingly used to reveal the nonlinear dynamics of collective modes in correlated many-body systems and their interplay with electromagnetic waves. Recent experiments demonstrated several surprising optical properties of transient states induced by driving, including the appearance of photo-induced edges in the reflectivity in cuprate superconductors, observed both below and above the equilibrium transition temperature. Furthermore, in other driven materials, reflection coefficients larger than unity have been observed. In this paper we demonstrate that unusual optical properties of photoexcited systems can be understood from the perspective of a Floquet system; a system with periodically modulated system parameters originating from pump-induced oscillations of a collective mode. We present a general phenomenological model of reflectivity from Floquet materials, which takes into account parametric generation of excitation pairs. We find a universal phase diagram of drive induced features in reflectivity which evidence a competition between driving and dissipation. To illustrate our general analysis we apply our formalism to two concrete examples motivated by recent experiments: a single plasmon band, which describes Josephson plasmons in layered superconductors, and a phonon-polariton system, which describes upper and lower polaritons in materials such as insulating SiC. Finally we demonstrate that our model can be used to provide an accurate fit to results of phonon-pump - terahertz-probe experiments in the high temperature superconductor YBa2Cu3O6.5. Our model explains the appearance of a pump-induced edge, which is higher in energy than the equilibrium Josephson plasmon edge, even if the interlayer Josephson coupling is suppressed by the pump pulse.

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 Dates: 2021-10-07
 Publication Status: Published online
 Pages: 14
 Publishing info: -
 Table of Contents: -
 Rev. Type: No review
 Identifiers: arXiv: 2110.03704
 Degree: -

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