Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2006-07-31
Physical review Letters 98, 036404 (2007)
Physics
Condensed Matter
Other Condensed Matter
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.98.036404
Excitons in a complex organic molecular crystal were studied by inelastic x-ray scattering (IXS) for the first time. The dynamic dielectric response function is measured over a large momentum transfer region, from which an exciton dispersion of 130 meV is observed. Semiempirical quantum chemical calculations reproduce well the momentum dependence of the measured dynamic dielectric responses, and thus unambiguously indicate that the lowest Frenkel exciton is confined within a fraction of the complex molecule. Our results demonstrate that IXS is a powerful tool for studying excitons in complex organic molecular systems. Besides the energy position, the IXS spectra provide a stringent test on the validity of the theoretically calculated exciton wave functions.
Bai L. H.
Cai Yong Q.
Chen Leonard P.
Chen Zgen-Hui
Feng D. L.
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