Phys.org March 14, 2024
Because of their differences from standard electrons, Dirac electrons are expected to add unprecedented electronic properties to materials. Researchers in Japan discovered a method enabling selective observation of the Dirac electrons in materials. Using electron spin resonance, to directly observe unpaired electrons in materials to distinguish differences in character, they established a method to determine their scope of action in the materials and their energies. They showed that electron spin resonance revealed that α-ET2I3 (ET = bis(ethylenedithio)-tetrathiafulvalene) at 1 bar contained a nearly three-dimensional DFs above ∼100 K coexisting with standard fermions. The close charge-transfer ET–I3 interactions accounted for temperature-sensitive three-dimensional band structures and temperature-independent resistivity behaviour. According to the researchers as 3D band structures cannot be depicted in a four-dimensional space, their method provides a general way to present important and easy-to-understand information of such band structures that cannot be obtained otherwise… read more. Open Access TECHNICAL ARTICLE
Graphical abstract. Credit: Mater. Adv., 2024,5, 1492-1501