Crossover from super- to subdiffusive motion and memory effects in crystalline organic semiconductors

Physical Review Letters
G De FilippisA de Candia

Abstract

The transport properties at finite temperature of crystalline organic semiconductors are investigated, within the Su-Schrieffer-Heeger model, by combining an exact diagonalization technique, Monte Carlo approaches, and a maximum entropy method. The temperature-dependent mobility data measured in single crystals of rubrene are successfully reproduced: a crossover from super- to subdiffusive motion occurs in the range 150≤T≤200  K, where the mean free path becomes of the order of the lattice parameter and strong memory effects start to appear. We provide an effective model, which can successfully explain features of the absorption spectra at low frequencies. The observed response to slowly varying electric field is interpreted by means of a simple model where the interaction between the charge carrier and lattice polarization modes is simulated by a harmonic interaction between a fictitious particle and an electron embedded in a viscous fluid.

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Citations

Sep 12, 2017·Nature Materials·S FratiniA Troisi
May 17, 2019·The Journal of Chemical Physics·Ian S DunnDavid R Reichman
Apr 17, 2016·The Journal of Chemical Physics·Jingjuan DongChang-Qin Wu
Jan 5, 2019·Physical Review Letters·John SousMona Berciu
May 11, 2019·Physical Review Letters·Eugenio CinquantaSalvatore Stagira

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