Researchers from the University of Tokyo and RIKEN have demonstrated that ferromagnetism can be induced in a quantum system by increasing particle motility and maintaining repulsive forces between atoms. This finding expands the concept of active matter to quantum systems and opens up possibilities for the development of magnetic-based technologies like magnetic memory and quantum computing. The study, published in Physical Review Research, shows that an ordered state can be achieved in quantum systems without extensive interactions between particles.
Active matter is a state where individual agents organize themselves, resulting in a phase transition from disorder to order without an external controller. The researchers aimed to apply the concept of active matter to quantum systems, which had not been explored before. Taking inspiration from flocking birds, the team created a theoretical model in which atoms behaved similar to birds, with increased motility leading to the emergence of ferromagnetism. This state is characterized by aligned spins, resembling how flocking birds face the same direction while flying.
The researchers used a multi-faceted approach to confirm their findings, including computer simulations, mean-field theory, statistical theory, and mathematical proofs based on linear algebra. The consistency of results across different methods reinforced the reliability of the discovery, marking the beginning of a new line of research. The unexpected ordering in the quantum model without complex interactions between atoms was a surprising outcome, deviating from expectations based on biophysical models.
The extension of active matter to the quantum realm is still in its early stages, with many aspects yet to be explored. The researchers plan to further develop the theory of quantum active matter and uncover its universal properties. Understanding how to induce and maintain ordered states in quantum systems has significant implications for the development of quantum technologies. By leveraging the principles of active matter in quantum systems, new opportunities for innovation and advancement in fields like magnetic memory and quantum computing can be explored.
The study highlights the potential of applying concepts from biophysics to quantum systems and the importance of interdisciplinary collaboration. By drawing parallels between flocking birds and quantum particles, researchers were able to demonstrate how increased particle motility and repulsive forces can lead to the emergence of ordered states in quantum systems. This novel approach could pave the way for the development of new technologies that capitalize on the magnetic properties of particles within a quantum framework.
Overall, the research conducted by the University of Tokyo and RIKEN scientists sheds light on the possibility of inducing ferromagnetism in quantum systems through active matter principles. By expanding the understanding of active matter to include quantum systems, the study opens up new avenues for exploring the behavior and manipulation of particles at the quantum level. The findings contribute to the foundational knowledge of quantum active matter and its potential applications, paving the way for further research and technological advancements in the field.
