Spectroscopic indications of polaronic carriers in the quasi-one-dimensional conductor (TaSe4)2I.
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.
Perfetti
L
L
Institut de Physique Appliquée, Ecole Polytechnique Fédérale (EPFL), CH-1015 Lausanne, Switzerland.
Berger
H
H
Reginelli
A
A
Degiorgi
L
L
Höchst
H
H
Voit
J
J
Margaritondo
G
G
Grioni
M
M