Milica Rutonjski, Petar Mali, Slobodan Radošević, Sonja Gombar, Milan Pantić, Milica Pavkov-Hrvojević. Exciton dynamics in different aromatic hydrocarbon systems[J]. Chinese Physics B, 2020, 29(10):
- Chinese Physics B
- Vol. 29, Issue 10, (2020)
Fig. 1. Schematic presentation of the analyzed crystal structures: pentacene and tetracene (sketch in color) vs picene and chrysene (gray-scale sketch). Each set of lattice vectors {a a b b { a + b 2 , − a + b 2 , − a + b 2 , − − a + b 2 }
Fig. 2. Exciton dispersion in pentacene along three different directions in reciprocal lattice at T = 20 K. Experimental data are taken from Ref. [12 ]. Theoretical curves are obtained for Δ = 1.915 eV, I 1 A x = 3.2 meV I 2 A x = 2.2 meV I 3 A x = 38.2 meV
![Exciton dispersion in pentacene along four different directions in reciprocal lattice at T = 300 K. Experimental data are taken from Ref. [10]. Theoretical curves are obtained for the exchange integral set from Fig. 2 and the gap value Δ = 1.83 eV.](/Images/icon/loading.gif){kind=icon}
Fig. 3. Exciton dispersion in pentacene along four different directions in reciprocal lattice at T = 300 K. Experimental data are taken from Ref. [10 ]. Theoretical curves are obtained for the exchange integral set from Fig. 2 and the gap value Δ = 1.83 eV.
Fig. 4. Exciton dispersion in tetracene along two different directions in reciprocal lattice. Experimental data at T = 20 K are taken from Ref. [14 ]. Theoretical curves are obtained for Δ = 2.405 eV, I 1 A x = 5.7 meV I 2 A x = 0.4 meV I 3 A x = 19.8 meV
Fig. 5. The 3D plot of exciton dispersion in pentacene at T = 20 K. Parameter set is the same as in Fig. 2 .
Fig. 6. Exciton dispersion in picene along three different directions in reciprocal lattice. Experimental data at T = 20 K are taken from Ref. [15 ]. Theoretical curves are obtained for Δ = 3.249 eV, I 1 A x = 2.8 meV I 2 A x = 2 meV I 3 A x = 2.8 meV
Fig. 7. Exciton dispersion in chrysene along three different directions in reciprocal lattice. Experimental data at T = 20 K are taken from Ref. [15 ]. Theoretical curves are obtained for Δ = 3.4 eV, I 1 A x = 2.8 meV I 2 A x = 2 meV I 3 A x = 2.8 meV
Fig. 8. The 3D plot of exciton dispersion in picene, obtained with the parameters from Fig. 6 .
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Table 1. Lattice constants and angles for the unit cells of studied structures.
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Table 2. Transport energy gaps (Eg) for studied structures vs calculated optical gaps (Δ) together with the corresponding
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