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Title: Solitons, polarons, and phonons in the infinite polyyne chain

Abstract

The infinite polyyne chain, ( CXC )/sub infinity/, or polyyne, is interpreted as a Peierls distorted one-dimensional metal with strong intrinsic electron-phonon coupling at the half-filled band level. Because there are two degenerate ..pi..-electron bands in polyyne the effective internal degeneracy (N-italic) of the electrons is 4, rather than 2 as in the model of polyacetylene. This leads to a rich variety of kink-soliton and polaron states and, in the limit of a continuum description, to the interesting result that polyyne is an approximate physical realization of an N-italic = 4 Gross-Neveu model relativistic field theory. The low-lying electronic excitations of the polymer are kink-solitons with charges 0, +- e-italic, and +- 2e-italic. The lowest-lying ionization states are a polaron, a bipolaron, and a tripolaron, with charges +- e-italic, +- 2e-italic, and +- 3e-italic, respectively. Photoexcitation of the polymer leads to a n-italice-italicu-italict-italicr-italica-italicl-italic polaron consisting of an electron and a hole bound by lattice distortion (''polarexciton''). Both the soliton and the polarons involve the appearance of localized intragap levels that are n-italico-italict-italic present in the ground state. Moreover, a localized e-italicx-italicc-italici-italict-italice-italicd-italic state exists for the polaron, while photoexcitation of the bipolaron and the tripolaron result in soliton-antisoliton pair production. Photoinducedmore » absorption measurements on long f-italici-italicn-italici-italict-italice-italic polyynes in solution should be able to confirm the photogeneration of the polarexciton.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Xerox Corporation, Webster Research Center (0114-38D), 800 Phillips Road, Webster, New York 14580
OSTI Identifier:
5062328
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B: Condens. Matter; (United States)
Additional Journal Information:
Journal Volume: 34:6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; POLYENES; PHONONS; POLARONS; SOLITONS; BAND THEORY; CARBON COMPOUNDS; DOPED MATERIALS; ELECTRON-PHONON COUPLING; ELECTRONIC STRUCTURE; FIELD THEORIES; IONIZATION; HYDROCARBONS; MATERIALS; ORGANIC COMPOUNDS; QUASI PARTICLES; 360404* - Materials- Polymers & Plastics- Physical Properties- (-1987)

Citation Formats

Rice, M J, Phillpot, S R, Bishop, A R, and Campbell, D K. Solitons, polarons, and phonons in the infinite polyyne chain. United States: N. p., 1986. Web. doi:10.1103/PhysRevB.34.4139.
Rice, M J, Phillpot, S R, Bishop, A R, & Campbell, D K. Solitons, polarons, and phonons in the infinite polyyne chain. United States. https://doi.org/10.1103/PhysRevB.34.4139
Rice, M J, Phillpot, S R, Bishop, A R, and Campbell, D K. Mon . "Solitons, polarons, and phonons in the infinite polyyne chain". United States. https://doi.org/10.1103/PhysRevB.34.4139.
@article{osti_5062328,
title = {Solitons, polarons, and phonons in the infinite polyyne chain},
author = {Rice, M J and Phillpot, S R and Bishop, A R and Campbell, D K},
abstractNote = {The infinite polyyne chain, ( CXC )/sub infinity/, or polyyne, is interpreted as a Peierls distorted one-dimensional metal with strong intrinsic electron-phonon coupling at the half-filled band level. Because there are two degenerate ..pi..-electron bands in polyyne the effective internal degeneracy (N-italic) of the electrons is 4, rather than 2 as in the model of polyacetylene. This leads to a rich variety of kink-soliton and polaron states and, in the limit of a continuum description, to the interesting result that polyyne is an approximate physical realization of an N-italic = 4 Gross-Neveu model relativistic field theory. The low-lying electronic excitations of the polymer are kink-solitons with charges 0, +- e-italic, and +- 2e-italic. The lowest-lying ionization states are a polaron, a bipolaron, and a tripolaron, with charges +- e-italic, +- 2e-italic, and +- 3e-italic, respectively. Photoexcitation of the polymer leads to a n-italice-italicu-italict-italicr-italica-italicl-italic polaron consisting of an electron and a hole bound by lattice distortion (''polarexciton''). Both the soliton and the polarons involve the appearance of localized intragap levels that are n-italico-italict-italic present in the ground state. Moreover, a localized e-italicx-italicc-italici-italict-italice-italicd-italic state exists for the polaron, while photoexcitation of the bipolaron and the tripolaron result in soliton-antisoliton pair production. Photoinduced absorption measurements on long f-italici-italicn-italici-italict-italice-italic polyynes in solution should be able to confirm the photogeneration of the polarexciton.},
doi = {10.1103/PhysRevB.34.4139},
url = {https://www.osti.gov/biblio/5062328}, journal = {Phys. Rev. B: Condens. Matter; (United States)},
number = ,
volume = 34:6,
place = {United States},
year = {1986},
month = {9}
}