Theory of biexcitons in mixed and segregated stack charge-transfer solids, molecular crystals and π-conjugated polymers

S. Mazumdar, Fangyeong Guo

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We discuss biexcitons within three different theoretical models in one dimension with excitonic interactions. We develop a general physical picture for optical absorption from the one-photon allowed exciton to the biexciton and to the two-exciton continuum in one dimension. Based on this picture, we propose a criterion of biexciton stability. The validity of our criterion of biexciton stability is proved in the strong-coupling limits of models describing mixed and segregated stack charge-transfer solids, while studies by other investigators have shown that the criterion also remains valid within the Frenkel exciton model with moderate exciton-exciton binding. Based on the same criterion of biexciton stability, we present theoretical evidence for stable biexcitons within the Coulomb-correlated model for π-conjugated polymers. High-energy picosecond photoinduced absorption in π-conjugated polymers is explained as a transition from the optical exciton to the biexciton.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalSynthetic Metals
Volume78
Issue number3
DOIs
Publication statusPublished - 1996 Apr 15

Fingerprint

Molecular crystals
Conjugated polymers
Excitons
Charge transfer
charge transfer
excitons
polymers
crystals
Electron transitions
Light absorption
LDS 751
optical absorption
Photons
continuums
photons

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

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abstract = "We discuss biexcitons within three different theoretical models in one dimension with excitonic interactions. We develop a general physical picture for optical absorption from the one-photon allowed exciton to the biexciton and to the two-exciton continuum in one dimension. Based on this picture, we propose a criterion of biexciton stability. The validity of our criterion of biexciton stability is proved in the strong-coupling limits of models describing mixed and segregated stack charge-transfer solids, while studies by other investigators have shown that the criterion also remains valid within the Frenkel exciton model with moderate exciton-exciton binding. Based on the same criterion of biexciton stability, we present theoretical evidence for stable biexcitons within the Coulomb-correlated model for π-conjugated polymers. High-energy picosecond photoinduced absorption in π-conjugated polymers is explained as a transition from the optical exciton to the biexciton.",
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Theory of biexcitons in mixed and segregated stack charge-transfer solids, molecular crystals and π-conjugated polymers. / Mazumdar, S.; Guo, Fangyeong.

In: Synthetic Metals, Vol. 78, No. 3, 15.04.1996, p. 187-193.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Theory of biexcitons in mixed and segregated stack charge-transfer solids, molecular crystals and π-conjugated polymers

AU - Mazumdar, S.

AU - Guo, Fangyeong

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