中国物理B ›› 2020, Vol. 29 ›› Issue (10): 107103-.doi: 10.1088/1674-1056/aba2de

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Milica Rutonjski1,†(), Petar Mali1, Slobodan Radošević1, Sonja Gombar1, Milan Pantić1, Milica Pavkov-Hrvojević1   

  • 收稿日期:2020-04-14 修回日期:2020-06-29 接受日期:2020-07-06 出版日期:2020-10-05 发布日期:2020-10-05
  • 通讯作者: Milica Rutonjski

Exciton dynamics in different aromatic hydrocarbon systems

Milica Rutonjski†, Petar Mali, Slobodan Rado\v sevi\'c, Sonja Gombar, Milan Panti\'c, and Milica Pavkov-Hrvojevi\'c   

  1. 1 Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovića 4, 21000 Novi Sad, Serbia
  • Received:2020-04-14 Revised:2020-06-29 Accepted:2020-07-06 Online:2020-10-05 Published:2020-10-05
  • Contact: Corresponding author. E-mail: milica.rutonjski@df.uns.ac.rs
  • About author:
    †Corresponding author. E-mail: milica.rutonjski@df.uns.ac.rs
    * Project supported by the Serbian Ministry of Education and Science (Grant No. OI-171009) and the Provincial Secretariat for High Education and Scientific Research of Vojvodina (Grant No. APV 114-451-2201).

Abstract:

The exciton dispersion is examined in the case of four selected prototypical molecular solids: pentacene, tetracene, picene, and chrysene. The model parameters are determined by fitting to experimental data obtained by inelastic electron scattering. Within the picture that relies on Frenkel-type excitons we obtain that theoretical dispersion curves along different directions in the Brillouin zone are in good agreement with the experimental data, suggesting that the influence of charge-transfer excitons on exciton dispersion of the analyzed organic solids is not as large as proposed. In reciprocal space directions where Davydov splitting is observed we employ the upgraded version of Hamiltonian used in Materials 11, 2219 (2018).

Key words: aromatic hydrocarbons, exciton dispersion, Heisenberg model, Davydov splitting

中图分类号:  (Excitons and related phenomena)

  • 71.35.-y
71.35.Aa (Frenkel excitons and self-trapped excitons) 71.35.Cc (Intrinsic properties of excitons; optical absorption spectra) 75.10.Dg (Crystal-field theory and spin Hamiltonians)