Abstract
We investigate theoretically photoluminescence (PL) properties of mono and di-phenyl substituted trans-polyacetylene (t-PA), namely, poly-phenylacetylene (PPA) and polydiphenylacetylene (PDPA), respectively. PL is a consequence of the occurrence of the two-photon state (2Ag) above the optically excited state (1Bu). Usually, electron correlation leads to confinement of 1Bu as well as the ground state. We show, in contrast, that in phenyl-substituted polyacetylenes electron-electron interactions cause enhanced delocalization of quasiparticles in the optically excited state from the backbone polyene chain into the phenyl groups. This coulomb enhanced delocalization in the transverse direction leads to confinement in the longitudinal direction and causes crossover between the 1Bu and 2Ag. We further show that in the absence of electron repulsion the low energy absorption is x-polarized whereas the high energy absorption is predominantly y-polarized. In contrast, in presence of many body electron interaction both of them (low and high energy absorptions) are x-polarized. Thus photophysics of PPA/PDPA etc. are consequences of true many body effects.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2793-2798 |
| Number of pages | 6 |
| Journal | International Journal of Modern Physics B |
| Volume | 15 |
| Issue number | 19-20 |
| State | Published - Aug 10 2001 |
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ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
- Statistical and Nonlinear Physics
- Mathematical Physics
Cite this
Electron correlation and photo physics of phenyl substituted polyacetylenes. / Ghosh, Haranath; Mazumdar, Sumitendra; Shukla, Alok.
In: International Journal of Modern Physics B, Vol. 15, No. 19-20, 10.08.2001, p. 2793-2798.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electron correlation and photo physics of phenyl substituted polyacetylenes
AU - Ghosh, Haranath
AU - Mazumdar, Sumitendra
AU - Shukla, Alok
PY - 2001/8/10
Y1 - 2001/8/10
N2 - We investigate theoretically photoluminescence (PL) properties of mono and di-phenyl substituted trans-polyacetylene (t-PA), namely, poly-phenylacetylene (PPA) and polydiphenylacetylene (PDPA), respectively. PL is a consequence of the occurrence of the two-photon state (2Ag) above the optically excited state (1Bu). Usually, electron correlation leads to confinement of 1Bu as well as the ground state. We show, in contrast, that in phenyl-substituted polyacetylenes electron-electron interactions cause enhanced delocalization of quasiparticles in the optically excited state from the backbone polyene chain into the phenyl groups. This coulomb enhanced delocalization in the transverse direction leads to confinement in the longitudinal direction and causes crossover between the 1Bu and 2Ag. We further show that in the absence of electron repulsion the low energy absorption is x-polarized whereas the high energy absorption is predominantly y-polarized. In contrast, in presence of many body electron interaction both of them (low and high energy absorptions) are x-polarized. Thus photophysics of PPA/PDPA etc. are consequences of true many body effects.
AB - We investigate theoretically photoluminescence (PL) properties of mono and di-phenyl substituted trans-polyacetylene (t-PA), namely, poly-phenylacetylene (PPA) and polydiphenylacetylene (PDPA), respectively. PL is a consequence of the occurrence of the two-photon state (2Ag) above the optically excited state (1Bu). Usually, electron correlation leads to confinement of 1Bu as well as the ground state. We show, in contrast, that in phenyl-substituted polyacetylenes electron-electron interactions cause enhanced delocalization of quasiparticles in the optically excited state from the backbone polyene chain into the phenyl groups. This coulomb enhanced delocalization in the transverse direction leads to confinement in the longitudinal direction and causes crossover between the 1Bu and 2Ag. We further show that in the absence of electron repulsion the low energy absorption is x-polarized whereas the high energy absorption is predominantly y-polarized. In contrast, in presence of many body electron interaction both of them (low and high energy absorptions) are x-polarized. Thus photophysics of PPA/PDPA etc. are consequences of true many body effects.
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M3 - Article
VL - 15
SP - 2793
EP - 2798
JO - International Journal of Modern Physics B
JF - International Journal of Modern Physics B
SN - 0217-9792
IS - 19-20
ER -