Gap Dynamics in Bi2212 Studied by Time- and Angle-Resolved Photoemission

ORAL

Abstract

Recent developments in ultrafast spectroscopy have shown that irradiating cuprate superconductors with intense, short pulses of light can induce nonequilibrium dynamics that may hold clues for understanding why the critical temperature (Tc) in these materials exceeds that of almost all other superconductors by an order of magnitude or more. Using a 1.5 eV pump pulse, and 5.9 eV probe, we use time- and angle-resolved photoemission spectroscopy (trARPES) to characterize the non-equilibrium dynamics of the gap and transient quasiparticle population in the cuprate superconductor Bi2212 (optimally doped, Tc=91 K). Correlations between these two quantities reveal clues for the underlying mechanism that drives the formation of the pseudogap and superconducting states in the hole-doped cuprates.

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Authors

  • Christopher Smallwood

    Department of Physics, UC Berkeley; and Materials Sciences Division, Lawrence Berkeley National Lab

  • Wentao Zhang

    Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, Materials Sciences Division, Lawrence Berkeley National Lab

  • Tristan Miller

    Department of Physics, UC Berkeley; and Materials Sciences Division, Lawrence Berkeley National Lab, Department of Physics, University of California Berkeley

  • Chris Jozwiak

    Advanced Light Source, Lawrence Berkeley National Lab

  • Hiroshi Eisaki

    Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology

  • Alessandra Lanzara

    University of California, Berkeley / Lawrence Berkeley National Laboratory, Department of Physics, University of California, Berkeley, CA 94720, USA, Department of Physics, UC Berkeley; and Materials Sciences Division, Lawrence Berkeley National Lab