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

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

2010-09-01

arxiv.org/abs/1009.0274v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

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.

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