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Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi 2 ⁢Sr 2 ⁢CaCu 2 ⁢O 8+𝛿

Gatuingt, Laurène [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)]·Alekhin, Alexandr [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000206216465)·Nilforoushan, Niloufar [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000284241295)·Houver, Sarah [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000221210889)·Sacuto, Alain [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)]·Gu, Genda [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000298863255)·Gallais, Yann [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ); Institut Universitaire de France (IUF), Paris (France)] (ORCID:0000000205891522)
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Abstract

Here, we report an ultrafast Time-Resolved Raman scattering study of the out-of-equilibrium photoinduced dynamics across the superconducting to normal state phase transition of the cuprate Bi 2 ⁢Sr 2⁢ CaCu 2 ⁢O 8+𝛿 . Using the polarization-resolved momentum space selectivity of Raman scattering, we track the superconducting condensate destruction and recovery dynamics with subpicoseconds time resolution in the antinodal region of the Fermi surface where the superconducting gap is maximum. Leveraging ultrafast Raman thermometry, we find a significant dichotomy between the superconducting condensate and the quasiparticle temperature dynamics near the antinodes, which cannot be framed in terms of a single effective electron temperature. The present work demonstrates the ability of Time-Resolved Raman scattering to selectively probe out-of-equilibrium pathways of different electronic subdegrees of freedom during a photoinduced phase transition.

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Gatuingt, Laurène [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)], Alekhin, Alexandr [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000206216465), Nilforoushan, Niloufar [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000284241295), Houver, Sarah [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)] (ORCID:0000000221210889), Sacuto, Alain [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ)], Gu, Genda [Brookhaven National Laboratory (BNL), Upton, NY (United States)] (ORCID:0000000298863255), Gallais, Yann [Université Paris Cité (France); Centre National de la Recherche Scientifique (CNRS), Paris (France). Laboratoire Matériaux et Phénomènes Quantiques (MPQ); Institut Universitaire de France (IUF), Paris (France)] (ORCID:0000000205891522). 2026-01-13. Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi 2 ⁢Sr 2 ⁢CaCu 2 ⁢O 8+𝛿. https://doi.org/10.1103/wkx7-lcqf

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