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This study marks a significant experimental breakthrough in quantum physics by successfully mapping the full wave functions of excitons in organic semiconductors using femtosecond time-resolved photoemission orbital tomography. By directly observing coherent delocalization and ultrafast dynamics previously inaccessible to measurement, this work provides critical data for designing next-generation organic photovoltaics and optoelectronic devices. The technique's ability to resolve both real-space and momentum-space profiles simultaneously sets a new standard for characterizing quantum states in low-dimensional materials.

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Quantum scientists map exciton wave functions in organic films

Quantum ZeitgeistSeptember 1, 20265 min read

Excitons, correlated electron-hole pairs governing optical and transport properties in organic semiconductors, have long resisted direct experimental access to their full quantum-mechanical wave functions. Researchers use femtosecond time-resolved photoemission orbital tomography (trPOT) to directly image the momentum-space distribution and ultrafast dynamics of excitons in α -sexithiophene thin films.

Researchers from seven institutions, including the University of Marburg, Forschungszentrum Jülich, and University of Graz, have directly imaged the quantum behavior of excitons, correlated electron-hole pairs central to the function of organic semiconductors. The team employed femtosecond time-resolved photoemission orbital tomography to map exciton wave functions in α-sexithiophene thin films, a feat previously inaccessible to experimental observation. This work, published August 28, 2026, reconstructs the exciton wave function in real space, revealing coherent delocalization across approximately three molecular units and a 25% contraction of the exciton radius within…

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