Interplay of Coherence and Material Order in Spin and Charge Transport

Julia Anthea Gessner^a

^aUniversity of Heidelberg, Im Neuenheimer Feld, 267, Heidelberg, Germany

Proceedings of MATSUS Fall 2026 Conference (MATSUSFall26)

B1 Fundamentals and Emerging Phenomena in Halide Perovskites

Palma, Spain, 2026 October 26th - 30th

Organizers: Sascha Feldmann, Paulina Plochocka and Alexander Urban

Oral, Julia Anthea Gessner, presentation 292
Publication date: 22nd July 2026

Understanding the coupled dynamics of charge carriers and spins in organic and hybrid semiconductors is crucial for the development of next-generation optoelectronic and spintronic devices. These materials host a range of emergent phenomena, including strong spin-orbit interactions, long-lived spin states and chirality-induced spin selectivity. Despite this richness, the microscopic mechanisms governing charge and spin transport remain incompletely understood, particularly the interplay between coherent and incoherent propagation, the emergence of ballistic transport and the transition to decoherence-limited diffusion.

Here, we investigate the fundamental transport behaviour of charge carriers and spins in representative organic and hybrid semiconductor systems using a novel microscopy approach that provides simultaneous access to spatially and temporally resolved charge and spin dynamics via holography [1,2]. This method, based on dual-camera acquisition, enables near shot-noise-limited mapping of charge carrier and spin dynamics. It allows us to directly follow the evolution of spins and charge carriers and to distinguish between diffusive and ballistic transport regimes, as well as their relation to coherence and material symmetry.

We consider a prototypical hybrid semiconductor, the metal-halide perovskite MAPbBr₃ thin film, as a model system for spin-orbit-coupled transport in soft crystalline lattices. Metal-halide perovskites are particularly attractive due to their strong spin-orbit coupling, long carrier diffusion lengths and exceptional optoelectronic quality combined with facile tunability via chemical composition [3,4]. In parallel, we study the organic semiconductor azapentacene, a molecular system characterized by well-defined π-conjugation and strong sensitivity of transport to intermolecular packing [5], making it an ideal platform to probe the role of coherence and structural order in organic spin and charge transport.

Our findings highlight the importance of coherence, molecular order and material symmetry in determining spin and charge transport pathways, and provide new insight into how ballistic and diffusive regimes emerge and compete in complex semiconductor systems.

References:

[1] M. Liebel, F. V. A. Camargo, G. Cerullo, and N. F. van Hulst, Ultrafast Transient Holographic Microscopy. Nano Letters 21, 4, 1666–1671 (2021). DOI=10.1021/acs.nanolett.0c04416.

[2] M. Hörmann, F. Visentin, J. A. Gessner, P. Kollenz, S. Liu, M. Heindl, F. Deschler, G. Cerullo, and F. V. A. Camargo, Ultrafast holographic chiroptical microscopy. Nature Photonics, 20, 592–599 (2026)

[3] A. Privitera, M. Righetto, F. Cacialli, and M. K. Riede, Perspectives of Organic and Perovskite-Based Spintronics. Advanced Optical Materials 9, 14, 2100215 (2021)

[4] T. Wiesner, M. Pardon, S. Maier, F. Rominger, J. Freudenberg, and U. H. F. Bunz, N-Acenoacenes: Synthesis and Solid-State Properties. Chemistry (Weinheim an der Bergstrasse, Germany) 28, 69, e202201916 (2022)

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