Revealing the Coulomb interaction strength in a cuprate superconductor

Abstract

We study optimally doped Bi${}_2$Sr${}_2$Ca${}_{0.92}$Y${}_{0.08}$Cu${}_2$O${}_{8+\delta }$ (Bi2212) using angle-resolved two-photon photoemission spectroscopy. Three spectral features are resolved near 1.5, 2.7, and 3.6 eV above the Fermi level. By tuning the photon energy, we determine that the 2.7-eV feature arises predominantly from unoccupied states. The 1.5- and 3.6-eV features reflect unoccupied states whose spectral intensities are strongly modulated by the corresponding occupied states. These unoccupied states are consistent with the prediction from a cluster perturbation theory based on the single-band Hubbard model. Through this comparison, a Coulomb interaction strength U of 2.7 eV is extracted. Our study complements equilibrium photoemission spectroscopy and provides a direct spectroscopic measurement of the unoccupied states in cuprates. The determined Coulomb U indicates that the charge-transfer gap of optimally doped Bi2212 is 1.1 eV.

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• Band resolved imaging of photocurrent in a topological insulator
• Theoretical Understanding of Photon Spectroscopies in Correlated Materials In and Out of Equilibrium
• Electronic structure of the putative room-temperature superconductor Pb${}_9$Cu(PO${}_4$)${}_6$O
• Role of electron-phonon coupling in excitonic insulator candidate Ta2NiSe5
• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Time-resolved ARPES on cuprates: Tracking the low-energy electrodynamics in the time domain
• Ab initio description of the Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ electronic structure
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• Electronic correlations in promising room-temperature superconductor Pb${}_9$Cu(PO${}_4$)${}_6$O: a DFT+DMFT study
• Probing the Lattice Anharmonicity of Superconducting YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Via Phonon Harmonics
• Discovery of Orbital Ordering in Bi2Sr2CaCu2O8+x
• Enhancement of maximum superconducting temperature by applying pressure and reducing the charge transfer gap
• Effect of strain-induced orbital splitting on the magnetic excitations in undoped cuprates
• Excited-state band structure mapping
• Origin of insulating-like behavior of Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+x}$ under pressure: A first-principles study