| Issue |
J. Phys. IV France
Volume 12, Number 9, November 2002
|
|
|---|---|---|
| Page(s) | 33 - 38 | |
| DOI | https://doi.org/10.1051/jp4:20020348 | |
J. Phys. IV France 12 (2002) Pr9-33
DOI: 10.1051/jp4:20020348
Band features and strong correlations in 1D Peierls systems
M. Grioni1, H. Berger1, L. Perfetti1, S. Mitrovic1, A. Reginelli1 and H. Hoechst21 Institut de Physique des Nanostructures, École Polytechnique Fédérale (EPFL), 1015 Lausanne, Switzerland
2 Synchrotron Radiation Center, University of Wisconsin, Stoughton, WI 53589-3097, U. S.A.
Abstract
High-resolution angle-resolved (ARPES) photoemission in the quasi-one dimensional (1D) Peierls
systems (TaSe
4)
2I and K
0.3MoO
3 reveals spectral features with clear 1D character. Their dispersion and
polarization dependence is consistent with open Fermi surfaces and with the symmetry properties of the lattice,
However the measured spectral lineshapes are unusual in various respects, as shown also by a comparison with
the quasiparticle spectra of a `good' metal. A consistent description of the normal metallic phase and of the
low-temperature insulating phases is possible within a polaronic scenario, where the carriers are strongly
renormalized by the interaction with the lattice and the spectrum is largely incoherent. The quasiparticle
signatures are hidden at the spectral leading edge.
© EDP Sciences 2002