Volume 125, Number 4, February 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||18 March 2019|
Two-channel model for optical conductivity of high-mobility organic crystals
1 Dipartimento di Fisica, Università di Napoli “Federico II” - Complesso Universitario di Monte S. Angelo I-80126 Napoli, Italy
2 SPIN- CNR Complesso Universitario di Monte S. Angelo - I-80126 Napoli, Italy
3 INFN, Sezione di Napoli - Complesso Universitario di Monte S. Angelo - I-80126 Napoli, Italy
4 RIKEN Center for Emergent Matter Science (CEMS) - Wako, Saitama 351-0198, Japan
5 Department of Applied Physics, The University of Tokyo - 7-3-1 Hongo, Bunkyo- ku, Tokyo 113-8656, Japan
Received: 31 August 2018
Accepted: 14 February 2019
We show that the temperature dependence of conductivity of high-mobility organic crystals pentacene and rubrene can be quantitatively described in the framework of the model where carriers are scattered by quenched local impurities and interact with phonons by Su-Schrieffer-Hegger (SSH) coupling. Within this model, we present approximation-free results for mobility and optical conductivity obtained by world line Monte Carlo, which we generalize to the case of coupling both to phonons and impurities. We find fingerprints of carrier dynamics in these compounds which differ from conventional metals and show that the dynamics of carriers can be described as a superposition of a Drude term representing diffusive mobile particles and a Lorentz term associated with dynamics of localized charges.
PACS: 72.80.Le – Polymers; organic compounds (including organic semiconductors) / 71.38.-k – Polarons and electron-phonon interactions / 78.40.Me – Organic compounds and polymers
© EPLA, 2019
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