Spectral properties of incommensurate charge-density wave systems
Institut für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany
2 Istituto Nazionale di Fisica della Materia e Dipartimento di Fisica, Università di Roma "La Sapienza", Piazzale A. Moro 2, 00185 Roma, Italy
Corresponding author: a email@example.com
Published online: 15 January 2000
The concept of frustrated phase separation is applied to investigate its consequences for the electronic structure of the high Tc cuprates. The resulting incommensurate charge density wave (CDW) scattering is most effective in creating local gaps in k-space when the scattering vector connects states with equal energy. Starting from an open Fermi surface we find that the resulting CDW is oriented along the (10)- and (or) (01)-direction which allows for a purely one-dimensional or a two-dimensional "eggbox type"charge modulation. In both cases the van Hove singularities are substantially enhanced, and the spectral weight of Fermi surface states near the M-points, tends to be suppressed. Remarkably, a leading edge gap arises near these points, which, in the eggbox case, leaves finite arcs of the Fermi surface gapless. We discuss our results with repect to possible consequences for photoemission experiments.
PACS: 74.72.-h – High-Tc compounds / 74.25.-q – General properties; correlations between physical properties in normal and superconducting states
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000