Unlocking Exotic States of Matter: RIKEN Demonstrates That Edges Are Not Essential

RIKEN physicists have successfully demonstrated the quantum anomalous Hall effect using a novel disk-like device, challenging the prior belief that edge states are essential for this phenomenon. By employing a layered, donut-shaped disk made from various magnetic topological insulators, the team showed a process known as Laughlin charge pumping without any edge channels connecting electrodes. This breakthrough expands the possibility for identifying new electronic behaviors in such materials.

The quantum anomalous Hall effect emerges in specific magnetic materials, resulting in large anomalous Hall resistance at low temperatures, with zero resistance along the current's direction. Traditionally, experiments in this area involved rectangular devices with edges essential for facilitating the quantum effect. However, this latest work overturns that theory by proving that edge states are not a prerequisite, indicating that unique electronic phenomena could arise in quantum anomalous Hall materials.

This research signifies a major advancement in understanding exotic states of matter beyond the classical states and illustrates the evolving field of quantum physics, with topological insulators being a key player in these discoveries. The findings, led by Minoru Kawamura and colleagues, were published in Nature Physics.



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