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arXiv · 1712.03339

Revealing the Coulomb interaction strength in a cuprate superconductor

S. -L. Yang·J. A. Sobota·Y. He·Y. Wang·D. Leuenberger·H. Soifer·M. Hashimoto·D. H. Lu·H. Eisaki·B. Moritz·T. P. Devereaux·P. S. Kirchmann·Z. -X. Shen
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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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S. -L. Yang, J. A. Sobota, Y. He, Y. Wang, D. Leuenberger, H. Soifer, M. Hashimoto, D. H. Lu, H. Eisaki, B. Moritz, T. P. Devereaux, P. S. Kirchmann, Z. -X. Shen. 2017-12-09. Revealing the Coulomb interaction strength in a cuprate superconductor. https://doi.org/10.1103/physrevb.96.245112

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