Spectroscopic Indications of Polaronic Carriers in the Quasi-One-Dimensional Conductor <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mrow><msub><mrow><mi>TaSe</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>2</mn></mrow></msub></mrow><mi>I</mi></math></span>

L. Perfetti; H. Berger; A. Reginelli; L. Degiorgi; H. Höchst; J. Voit; G. Margaritondo; M. Grioni

doi:10.1103/PhysRevLett.87.216404

Spectroscopic Indications of Polaronic Carriers in the Quasi-One-Dimensional Conductor $({TaSe}_{4})_{2} I$

L. Perfetti, H. Berger, A. Reginelli, L. Degiorgi, H. Höchst, J. Voit, G. Margaritondo, and M. Grioni

Phys. Rev. Lett. 87, 216404 – Published 2 November 2001

Abstract

Angle-resolved photoemission (ARPES) on the quasi-one-dimensional conductor $({TaSe}_{4})_{2} I$ shows a hidden Fermi-surface crossing in its metallic state and the opening of a Peierls gap at low temperatures. The underlying quasiparticles have vanishing spectral weight and extremely short coherence lengths. They are interpreted as polarons in the strong-coupling adiabatic limit, and almost all their ARPES weight is incoherent. These observations suggest a scenario where the long-standing contradictions between ARPES and other experiments on Peierls materials could be resolved.

Received 20 June 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.216404

Authors & Affiliations

L. Perfetti¹, H. Berger¹, A. Reginelli¹, L. Degiorgi², H. Höchst³, J. Voit⁴, G. Margaritondo¹, and M. Grioni¹

¹Institut de Physique Appliquée, Ecole Polytechnique Fédérale (EPFL), CH-1015 Lausanne, Switzerland
²Laboratorium für Festkörperphysik, ETH Zurich, CH-8093 Zurich, Switzerland
³Synchrotron Radiation Center, University of Wisconsin, Stoughton, Wisconsin 53589-3097
⁴Theoretische Physik 1, Universität Bayreuth, D-95440 Bayreuth, Germany