title: Spectroscopic indications of polaronic carriers in the quasi-one-dimensional conductor (TaSe4)2I.
abstract: Angle-resolved photoemission (ARPES) on the quasi-one-dimensional conductor (TaSe4)2I 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.
authors.affiliation: Institut de Physique Appliquée, Ecole Polytechnique Fédérale (EPFL), CH-1015 Lausanne, Switzerland.
authors.forename: L
authors.initials: L
authors.lastname: Perfetti
authors.forename: H
authors.initials: H
authors.lastname: Berger
authors.forename: A
authors.initials: A
authors.lastname: Reginelli
authors.forename: L
authors.initials: L
authors.lastname: Degiorgi
authors.forename: H
authors.initials: H
authors.lastname: Höchst
authors.forename: J
authors.initials: J
authors.lastname: Voit
authors.forename: G
authors.initials: G
authors.lastname: Margaritondo
authors.forename: M
authors.initials: M
authors.lastname: Grioni