Ultrafast carrier localisation in the pseudogap state of cuprate superconductors from coherent quench experiments

Abstract

A pseudogap (PG) was introduced by Mott to describe a state of matter which has a minimum in the density of states at the Fermi level, deep enough for states to become localized. It can arise either from Coulomb repulsion between electrons, or due to an incipient charge or spin order, or a combination of the two. These states are rapidly fluctuating in time with random phase, so they are hard to observe experimentally. Here we present the first coherent quench measurements of the dynamical transition to the pseudogap state in the prototype high temperature superconductor Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$, revealing a marked absence of incipient collective ordering beyond a few coherence lengths on short timescales at any level of doping. Instead we find evidence for sub-picosecond carrier localization favouring a picture of pairing resulting from the competing Coulomb interaction and strain, enhanced by a Fermi surface instability.

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• Ultrafast optical spectroscopy of strongly correlated materials and high-temperature superconductors: a non-equilibrium approach
• Ultrafast jamming of electrons into an amorphous entangled state
• Probing ultrafast spin-relaxation and precession dynamics in a cuprate Mott insulator with 7-fs optical pulses
• Coupled charge and spin dynamics in a photo-excited Mott insulator
• Multi-Band Superconductivity and the Steep Band -- Flat Band Scenario
• Disorder-sensitive pump-probe measurements on Nd${}_{1.83}$Ce${}_{0.17}$CuO${}_{4\pm \delta }$ films
• Dynamics of the superconducting order parameter through ultrafast normal-to-superconducting phase transition in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ from multi-pulse polarization-resolved transient optical reflectivity
• A picture of pseudogap phase related to charge fluxes
• Inter-site pair superconductivity: origins and recent validation experiments
• Two-Dimensional Charge Localization at the Perovskite Oxide Interface
• Pseudogap isotope effect as a probe of bipolaron mechanism in high temperature superconductors
• Energy density driven ultrafast electronic excitations in a cuprate superconductor
• Possible Spatial Correlation of Superconducting and Pseudogap Dynamics in a Bi-based Cuprate