ARPES studies of cuprate Fermiology: superconductivity, pseudogap, and quasiparticle dynamics

Abstract

We present angle-resolved photoemission spectroscopy (ARPES) studies of the cuprate high-temperature superconductors which elucidate the relation between superconductivity and the pseudogap and highlight low-energy quasiparticle dynamics in the superconducting state. Our experiments suggest that the pseudogap and superconducting gap represent distinct states, which coexist below T${}_c$. Studies on Bi-2212 demonstrate that the near-nodal and near-antinodal regions behave differently as a function of temperature and doping, implying that different orders dominate in different momentum-space regions. However, the ubiquity of sharp quasiparticles all around the Fermi surface in Bi-2212 indicates that superconductivity extends into the momentum-space region dominated by the pseudogap, revealing subtlety in this dichotomy. In Bi-2201, the temperature dependence of antinodal spectra reveals particle-hole asymmetry and anomalous spectral broadening, which may constrain the explanation for the pseudogap. Recognizing that electron-boson coupling is an important aspect of cuprate physics, we close with a discussion of the multiple 'kinks' in the nodal dispersion. Understanding these may be important to establishing which excitations are important to superconductivity.

To appear in a focus issue on 'Fermiology of Cuprates' in New Journal of Physics

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• Inelastic Light Scattering From Correlated Electrons
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• How Cooper pairs vanish approaching the Mott insulator in Bi2Sr2CaCu2O8+d
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• Coupling of Low Energy Electrons in Optimally Doped Bi2212 to an Optical Phonon Mode
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• Angle-resolved photoemission spectroscopy of a Fermi-Hubbard system
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• Dual parquet scheme for the two-dimensional Hubbard model: modelling low-energy physics of high-$T_c$ cuprates with high momentum resolution
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• Superconductivity and Pairing Fluctuations in the Half-Filled Two-Dimensional Hubbard Model
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