Spectral properties of incommensurate charge-density wave systems |
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Authors: | G Seibold F Becca F Bucci C Castellani C Di Castro M Grilli |
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Institution: | (1) Institut für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany, DE;(2) Istituto Nazionale di Fisica della Materia e Dipartimento di Fisica, Università di Roma “La Sapienza”, Piazzale A. Moro 2, 00185 Roma, Italy, IT |
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Abstract: | The concept of frustrated phase separation is applied to investigate its consequences for the electronic structure of the
high T
c
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.
Received 14 June 1999 |
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Keywords: | PACS 74 72 -h High-Tc compounds - 74 25 -q General properties correlations between physical properties in normal and superconducting states |
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