Tokyo, Japan – Structure dictates function. Scientists increasingly use artificial intelligence (AI) to design the arrangement of atoms in new materials with desired properties. Now, researchers at the Institute of Industrial Science, The University of Tokyo have extended a leading generative AI model so that it designs the electronic structure of a material together with its crystal structure. The new model, named MatterGen- e - , is reported in npj Computational Materials .
New materials have traditionally been invented using trial-and-error experiments (a slow process) or randomly generating candidates on a computer and screening the results (which is computationally expensive).
A game changer is inverse design – a target property is specified initially (e.g., the specific band gap or formation energy), and AI rapidly and directly designs a matching structure for a stable crystal. Generative machine learning models, which learn from existing crystal data, are well suited to this task because they can create entirely new materials. One specific AI model, called generative machine learning, can learn from existing crystal data and then create completely new materials.
The chemical and physical properties of a crystalline material (e.g., the hardness, electrical conductivity, and optical behavior) depend on atomic-scale properties: the crystal structure (the arrangement of molecules in a repeating three-dimensional pattern) and the electronic structure (how electrons are distributed among energy levels and around atoms).
Microsoft Research reported a generative model for inorganic crystals (MatterGen) in early 2025. This diffusion-based model generates new, stable crystal structures using structural variables: atom types, coordinates, and lattices. However, it is difficult for a model to learn a correlation between a macroscopic property and the crystal structure using the limited amount of data available.
The team at the University of Tokyo made it easier for the model to learn from data by incorporating descriptors of the local electronic structure alongside the crystal structure – the Bader charge (the electronic charge assigned to each atom in the crystal lattice ) and the atomic density of states (descriptors of the local electronic structure).
“The electronic structure physically determines a macroscopic property and is strongly constrained by the local atomic arrangement,” says lead author of the study, Ibuki Okuda. “Consequently, our electronic descriptors serve as an intermediate representation between structure and property.”
For target values of the formation energy and band gap, MatterGen- e - produced substantially more structures that were simultaneously valid, stable, unique, and novel than MatterGen. By outputting electronic descriptors together with each structure, MatterGen- e - also provides the density of states of newly generated materials, which agreed reasonably well with first-principles calculations.
“We performed control experiments replacing the electronic descriptors with noisy Bader charges or a dummy variable with no physical meaning,” explains senior author, Teruyasu Mizoguchi. “The stability and validity of the generated structures improved only when physically meaningful descriptors were used. Thus, the quality of the electronic information, not the number of variables, is what matters.”
These findings point to a design principle for generative models in materials science: using physically meaningful intermediate representations, such as electronic structure, rather than atomic structure alone. Defining electronic descriptors for each atom means the approach is not limited to bulk crystals. Using this model could improve the generation of surfaces and interfaces, where local electronic states govern material properties.
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The article, “Inverse materials design via joint generation of crystal structures and local electronic descriptors”, will be published in npj Computational Materials at DOI: 10.1038/s41524-026-02322-4 .
The Institute of Industrial Science, The University of Tokyo (UTokyo-IIS) is one of the largest university-attached research institutes in Japan. UTokyo-IIS is comprised of over 120 research laboratories—each headed by a faculty member—and has over 1,200 members (approximately 400 staff and 800 students) actively engaged in education and research. Its activities cover almost all areas of engineering. Since its foundation in 1949, UTokyo-IIS has worked to bridge the huge gaps that exist between academic disciplines and real-world applications.
npj Computational Materials
Inverse Materials Design via Joint Generation of Crystal Structures and Local Electronic Descriptors
15-Oct-2026