FSU physicists have discovered a new state of matter in electrons, opening up a platform to study quantum phenomena. This groundbreaking research, led by a team at Florida State University, including National High Magnetic Field Laboratory Dirac Postdoctoral Fellow Aman Kumar, Associate Professor Hitesh Changlani, and Assistant Professor Cyprian Lewandowski, has revealed conditions that stabilize a unique phase of matter where electrons form a solid crystalline lattice but can 'melt' into a liquid state, known as a generalized Wigner crystal. Their work, published in npj Quantum Materials, a Nature publication, sheds light on the behavior of electrons in two-dimensional systems and has significant implications for quantum computing, advanced superconductivity, and more.
The phenomenon occurs when certain materials allow electron flow to 'freeze' into crystallized shapes, transforming the material from a conductor to an insulator. This transition provides a unique window into the complex behavior of electrons, enabling new technologies in quantum computing, advanced superconductivity for energy and medical imaging, lighting, and highly precise atomic clocks.
The researchers used FSU's Research Computing Center and the National Science Foundation's ACCESS to conduct calculations and large-scale simulations. They determined the 'quantum knobs' to trigger the phase transition, achieving a generalized Wigner crystal that forms different crystalline shapes, unlike traditional Wigner crystals. This discovery was made possible through advanced numerical techniques, such as exact diagonalization and density matrix renormalization group, which simplify vast amounts of quantum information.
The team also uncovered a new state of matter where conducting and insulating properties coexist due to unusual electron behaviors. They found that the generalized Wigner crystal can partially 'melt,' with some electrons remaining frozen and others delocalizing and moving around the system. This 'pinball phase' is an exciting new phase of matter, where some electrons want to freeze and others want to float, resulting in both insulating and conducting properties.
This research provides scientists with a deeper understanding of how to manipulate states of matter. By tuning 'quantum knobs' or energy scales, phase transitions in electrons can be driven from solid to liquid. Studying Wigner crystals offers insights into quantum phases of matter, with potential applications in powerful quantum computing and spintronics, a field that can revolutionize nano-electronic devices.
The research team aims to better understand the cooperative behavior of electrons and address theoretical questions, leading to breakthrough applications in quantum, superconducting, and atomic technologies. This discovery paves the way for further exploration and innovation in the field of quantum physics.
