title: Carrier dynamics in conducting polymers: case of PF6 doped polypyrrole.
abstract: The carrier dynamics in PF6 doped polypyrrole has been probed by dielectric spectroscopy (from 10(-4) to 4 eV), down to 4.2 K. The phase-sensitive sub-THz data have assisted to resolve the discrepancies in Kramers-Kronig analysis in earlier studies. Even in metallic samples, just 1% of the carriers are delocalized, at 300 K; the fraction drops down considerably as a function of disorder, carrier density, and temperature. This subtle metallic feature and the anomalies in carrier dynamics are attributed to coherent and incoherent transport between short conjugated segments.
authors.affiliation: Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
authors.forename: I G
authors.initials: IG
authors.lastname: Romijn
authors.forename: H J
authors.initials: HJ
authors.lastname: Hupkes
authors.forename: H C F
authors.initials: HC
authors.lastname: Martens
authors.forename: H B
authors.initials: HB
authors.lastname: Brom
authors.forename: A K
authors.initials: AK
authors.lastname: Mukherjee
authors.forename: R
authors.initials: R
authors.lastname: Menon