From left: Shiva Safaei, David Mazziotti and LeeAnn Sager discuss their finding that a dual state of matter with both fermion and exciton condensates could exist. Photo: University of Chicago.Three scientists from the University of Chicago have run the numbers, and they believe there may be a way to make a material that can conduct both electricity and energy with 100% efficiency – never losing any to heat or friction.
Their breakthrough, reported in a paper in Physical Review B, suggests a framework for an entirely new type of matter, which could have very useful technological applications in the real world. Though their prediction is based on theory, efforts are now underway to test it experimentally.
"We started out trying to answer a really basic question, to see if it was even possible – we thought these two properties might be incompatible in one material," said David Mazziotti, a professor of chemistry and an expert in molecular electronic structure. "But to our surprise, we found the two states actually become entangled at a quantum level, and so reinforce each other."
Since an untold amount of energy is lost from power lines, engines and machinery every year, scientists are eager to find more efficient alternatives. "In many ways, this is the most important question of the 21st century – how to generate and move energy with minimal loss," Mazziotti said.
Scientists have known about superconductors, which can conduct electricity with nearly zero loss, for more than a century. But it was only in the past few years that they managed to make a similar material in the laboratory that can conduct energy with nearly zero loss, called an exciton condensate.
Both superconductors and exciton condensates are tricky materials to make and to keep functioning – partly because scientists don't fully understand how they work and the theory behind them is incomplete. Scientists do know, however, that both involve the action of quantum physics.
LeeAnn Sager, a graduate student, began to wonder how the two states could be generated in the same material. Mazziotti's group specializes in exploring the properties and structures of materials and chemicals using computation, so she began plugging different combinations into a computer model. "We scanned through many possibilities, and then to our surprise, found a region where both states could exist together," she said.
It appears that in the right configuration, the two states actually become entangled – a quantum phenomenon in which systems become intangibly linked together. This challenges the conventional notion that the two states are unrelated, and may open a new field of dual exciton and fermion pair condensates.
Using some advanced mathematics, the scientists showed that thanks to this quantum entanglement, the dual condensates should theoretically exist even at macroscopic size – that is, visible to the human eye. "This implies that such condensates may be realizable in novel materials, such as a double layer of superconductors," Sager said.
The scientists are now working with experimental groups to see if their prediction can be achieved in real materials.
"Being able to combine superconductivity and exciton condensates would be amazing for lots of applications – electronics, spintronics, quantum computing," said Shiva Safaei, a postdoctoral researcher and third author of the paper. "Though this is a first step, it looks extremely promising."
This story is adapted from material from the University of Chicago, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.