Low-energy electrons have been found to mimic relativistic high-energy particles in cadmium arsenide. This defines the first stable '3D Dirac semimetal', which holds promise for fundamental-physics exploration and practical applications.
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Zhu, Z., Hoffman, J. Catching relativistic electrons. Nature 513, 319–320 (2014). https://doi.org/10.1038/513319a
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DOI: https://doi.org/10.1038/513319a
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Electronic and optical properties of topological semimetal Cd3As2
Scientific Reports (2017)