Science, Space and Technology News 2024
An ultra-short flash of light breaks the bond between the electron and the hole , enabling research on charge-transfer processes in atomically thin semiconductors. Credit: Lukas Kroll, Jan Philipp Bange, Marcel Reutzel, Stefan Mathias: Science Advances DOI: 10.1126/sciadv.adi1323
Semiconductors are found everywhere in contemporary technology, serving to either facilitate or block the flow of electricity. In order to understand the potential of two-dimensionalfor future computer and photovoltaic technologies, researchers from the Universities of Göttingen, Marburg, and Cambridge investigated the bond that builds between the electrons and holes contained in these materials.
As physicist and first author Jan Philipp Bange from the University of Göttingen explains: “In our laboratory, we use photoemission spectroscopy to investigate how the absorption of light in quantum materials leads to charge transfer processes. So far, we have concentrated on the electrons that are part of the electron-hole pair, which we can measure using an electron analyzer. Up to now, we didn’t have any way to directly access the holes themselves.
Mathias summarises: “In the future, we want to use the spectroscopic signature of the interaction between electrons and holes to study novel phases in quantum materials at ultrashort time and length scales. Such studies can be the basis for the development of new technologies and we hope to contribute to this in the future.”
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