Density wave-like charge dynamics in conducting polypyrrole

Authors
Lee, KH Menon, R Heeger, AJ
Citation
Kh. Lee et al., Density wave-like charge dynamics in conducting polypyrrole, SYNTH METAL, 119(1-3), 2001, pp. 653-654
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
SYNTHETIC METALS
ISSN journal
03796779 → ACNP
Volume
119
Issue
1-3
Year of publication
2001
Pages
653 - 654
Database
ISI
SICI code
0379-6779(20010315)119:1-3<653:DWCDIC>2.0.ZU;2-#
Abstract
Reflectance spectra of polypyrrole (PPy) doped with PF6, obtained at 250K a nd below, show the formation of a peak in the joint density of states at 11 0 cm(-1) and an associated redistribution of oscillator strength. In additi on, a Fano-like resonance is observed at 70 cm(-1). We discuss the results in terms of a transition to a density-wave ground state characterized by an energy gap (2 Delta /hc approximate to 100 cm(-1)) and a pinned collective mode (at 70 cm(-1)).