Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Transport properties II

HL 46.5: Vortrag

Donnerstag, 21. März 2024, 16:15–16:30, ER 325

Universal Theory of Hall Transport in Organic Semiconductors — •Michel Panhans and Frank Ortmann — TUM School of Natural Sciences, Technische Universität München, 85748 Garching b. München, Germany

The investigation of Hall transport is a key experimental method to understand transport mechanisms in organic semiconductors (OSCs). Despite many experimental observations of the Hall effect in OSCs, theoretical descriptions usually fail to understand these experiments.

This lack in the theoretical description motivated our recent study, where we develop a universal theory to understand the Hall effect in OSCs and beyond. Our new approach embeds previous theoretical descriptions covering different aspects of Hall transport ranging from semi-classical band-transport approaches, via topological descriptions utilizing geometrical concepts such as the Berry curvature to disorder driven transport scenarios.

Using rubrene as a showcase, we discuss the range of validity of different Hall-transport regimes and finally compare our results for the temperature-dependent Hall mobility to the experiment. The determination of the Hall mobility allows us to quantify the number of charge carriers that are responsive to the magnetic field. These results can be used to classify the charge transport in rubrene in terms of band-like and hopping transport at different temperatures.

Keywords: Hall Effect; Quantum Transport Simulations; Organic Semiconductors