Time- and Momentum-resolved Gap Dynamics in Bi2Sr2CaCu2O8+delta

Abstract

We use time- and angle-resolved photoemission spectroscopy to characterize the dynamics of the energy gap in superconducting Bi2Sr2CaCu2O8+delta (Bi2212). Photoexcitation drives the system into a nonequilibrium pseudogap state: Near the Brillouin zone diagonal (inside the normal-state Fermi arc), the gap completely closes for a pump fluence beyond F = 15 μJ/cm^2; toward the Brillouin zone face (outside the Fermi arc), it remains open to at least 24 μJ/cm^2. This strongly anisotropic gap response may indicate multiple competing ordering tendencies in Bi2212. Despite these contrasts, the gap recovers with relatively momentum-independent dynamics at all probed momenta, which shows the persistent influence of superconductivity both inside and outside the Fermi arc.

9 pages, 8 figures

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• Ultrafast carrier localisation in the pseudogap state of cuprate superconductors from coherent quench experiments
• Near-infrared light-induced superconducting-like state in underdoped YBa${}_2$Cu${}_3$O${}_y$ studied by $c$-axis terahertz third-harmonic generation
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• Quasi-particles ultrafastly releasing kink bosons to form Fermi arcs in a cuprate superconductor
• Signatures of enhanced superconducting phase coherence through MID-IR excitation in optimally doped Y-Bi2212
• Time-resolved ARPES on cuprates: Tracking the low-energy electrodynamics in the time domain
• Influence of Optically Quenched Superconductivity on Quasiparticle Relaxation Rates in Bi2Sr2CaCu2O8+delta
• Time-resolved spectral density of interacting fermions following a quench to a superconducting critical point
• Lindblad master equation approach to the dissipative quench dynamics of planar superconductors
• Particle-hole Asymmetry in the Cuprate Pseudogap Measured with Time-Resolved Spectroscopy
• Ultrafast creation of a light induced semimetallic state in strongly excited 1T-TiSe${}_2$
• 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
• Real time measurement of the emergence of superconducting order in a high temperature superconductor
• Nonequilibrium Electron Dynamics in a Solid with a Changing Nodal Excitation Gap
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• Dynamical generation of superconducting order of different symmetries in hexagonal lattices
• Ultrafast destruction and recovery of the spin density wave order in iron based pnictides: a multi-pulse optical study
• Photoinduced changes of the chemical potential in superconducting Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Transport and spectral signatures of transient fluctuating superfluids in the absence of long-range order
• Interplay of superconductivity and bosonic coupling in the peak-dip-hump structure of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Model Predictions for Time-Resolved Transport Measurements Made near the Superfluid Critical Points of Cold Atoms and $K_3{C}_{60}$ Films
• Photoinduced filling of near nodal gap in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$
• Ubiquitous suppression of the nodal coherent spectral weight in Bi-based cuprates
• Dynamics of non-thermal states in optimally-doped $B{i}_{2}S{r}_{2}C{a}_{0.92}{Y}_{0.08}C{u}_2{O}_{8+\delta }$ revealed by mid-infrared three-pulse spectroscopy
• Momentum-dependent relaxation dynamics of the doped repulsive Hubbard model
• Ultrafast Raman probe of the photoinduced superconducting to normal state transition in the cuprate Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$