“Hubbard Excitons” – Caltech Physics Discovery Could Lead to Incredible New Technologies

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In art, the negative space in a painting can be just as important as the painting itself. Something similar is true in insulating materials, where the empty spaces left behind by missing electrons play a crucial role in determining the material’s properties. When a negatively charged electron is excited by light, it leaves behind a positive hole. Because the hole and the electron are oppositely charged, they are attracted to each other and form a bond.

“In most insulators, oppositely charged electrons and holes interact with one another just as an electron and a proton bind to form a hydrogen,” Mehio explains. “However, in a special class of materials known as Mott insulators, the photo-excited electrons and holes instead bind through magnetic interactions.”The results could have applications in the development of new exciton-related technologies, or excitonics, in which the excitons would be manipulated through their magnetic properties.

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