Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$

Laurène Gatuingt; Alexandr Alekhin; Niloufar Nilforoushan; Sarah Houver; Alain Sacuto; Genda Gu; Yann Gallais

doi:10.1103/wkx7-lcqf

paper

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

arXiv:2508.04385 · doi:10.1103/wkx7-lcqf

Abstract

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 sub-picoseconds time resolution in the anti-nodal 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 anti-nodes, 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 sub-degrees of freedom during a photoinduced phase transition.

12 pages, 5 figures, 2 appendices

Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi2​Sr2​CaCu2​O8+δ​

Abstract

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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 $_{8 + δ}$