A light-induced charge order mode in a metastable cuprate ladder

2025/10/28 by Padma, Hari, Sharma, Prakash, TenHuisen, Sophia F. R. +17
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2510.24686

Abstract

We report the observation of an emergent charge order mode in the optically-excited cuprate ladder Sr₁₄Cu₂₄O₄₁. Near-infrared light in the ladder plane drives a symmetry-protected electronic metastable state together with a partial melting of the equilibrium charge order. Our time-resolved resonant inelastic x-ray scattering measurements at the upper Hubbard band reveal a gapless collective excitation dispersing from the charge-order wavevector up to 0.8 eV with a slope on the order of the quasiparticle velocity. These findings reveal a regime where correlated carriers acquire itinerant character at finite momentum, and charge order becomes dynamically fluctuating, offering a platform to explore light-induced pairing instabilities.

Citations

• Direct Observation of the Lindhard Continuum using Resonant Inelastic X-ray Scattering
• Symmetry-protected electronic metastability in an optically driven cuprate ladder
• Cooper-Pair Localization in the Magnetic Dynamics of a Cuprate Ladder
• Metastability in Coexisting Competing Orders
• Photo-induced nonequilibrium states in Mott insulators

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• Charge critical fluctuations in cuprates: Isotope effect, pseudogap, conductivity, and Raman spectroscopy