Transient localization in crystalline organic semiconductors

S. Ciuchi (1) , Simone Fratini (2) , Didier Mayou (3)

1 Dipartimento di Fisica [L'Aquila]
2 NEEL - TMC - Théorie de la Matière Condensée
3 NEEL - OPTIMA - Optique et Matériaux

A relation derived from the Kubo formula shows that optical conductivity measurements below the gap frequency in doped semiconductors can be used to probe directly the time-dependent quantum dynamics of charge carriers. This allows to extract fundamental quantities such as the elastic and inelastic scattering rates, as well as the localization length in disordered systems. When applied to crystalline organic semiconductors, an incipient electron localization caused by large dynamical lattice disorder is unveiled, implying a breakdown of semiclassical transport.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

S. Ciuchi, Simone Fratini, Didier Mayou. Transient localization in crystalline organic semiconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 83, pp.081202. ⟨10.1103/PhysRevB.83.081202⟩. ⟨hal-00704596⟩