Amplitude breathers in conjugated polymers

S. R. Phillpot, A. R. Bishop, B. Horovitz

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Nonlinear adiabatic dynamics of electron-phonon models of trans-(CH)x, cis-(CH)x, and (AB)x-type polymers are studied. Using both analytic low-amplitude expansion and numerical simulations, we find the existence of charge-neutral breathers spatially localized, time-periodic nonlinear excitations. Simulations also show that a photoexcited electron-hole pair generates a breather in addition to a soliton-antisoliton pair. Semiclassical quantization shows that the nth breather is a bound state of n amplitude phonons. A semiclassical formalism of optical absorption is applied to trans-(CH)x; the ground-state result accounts for a pronounced intragap absorption tail, while breathers can account for the observed photoinduced absorption at 1.35 eV.

Original languageEnglish
Pages (from-to)1839-1855
Number of pages17
JournalPhysical Review B
Issue number3
StatePublished - 1 Jan 1989

ASJC Scopus subject areas

  • Condensed Matter Physics


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