Reading beyond the peaks: Optical analysis decodes spectral complexity in twisted semiconductor layers
A study from the Research Center for Materials Nanoarchitectonics (MANA), one of the centers under the National Institute for Materials Science (NIMS), presents a new method to reveal hidden material disorder reflected in complex photoluminescence spectra, paving the way for new optical diagnostics of material disorder in two-dimensional semiconductors and related light-emitting materials.
Researchers at the Research Center for Materials Nanoarchitectonics (MANA) under the National Institute for Materials Science (NIMS) have developed a new method to decode the complex photoluminescence spectra of twisted semiconductor layers, revealing hidden material disorder. This breakthrough could lead to improved optical diagnostics and more reliable materials for light-emitting devices, optical sensors, and quantum technologies.
By analyzing the hierarchical disorder in moiré exciton photoluminescence, the theoretical framework enables researchers to infer the underlying disorder landscape without relying on spectral peak decomposition, which is often uncertain. The study highlights two scales of disorder: a smooth micrometer-scale background and localized defects or exciton traps.
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