Unleashing Exotic States of Matter: RIKEN Proves Edges Unnecessary — Contrary to expectation, e |
RIKEN physicists have demonstrated a unique quantum state called the quantum anomalous Hall effect in a disk-like device, proving that edge states aren’t necessary for this process. The team demonstrated Laughlin charge pumping in a quantum anomalous Hall insulator using a layered, donut-shaped disk composed of different magnetic topological insulators. This discovery expands the potential for discovering more new electronic phenomena in such materials.
Physics has long moved on from the three classic states of matter: solid, liquid, and gas. A better theoretical understanding of quantum effects in crystals and the development of advanced experimental tools to probe and measure them has revealed a whole host of exotic states of matter. In some magnetic materials, this phenomenon can arise even when a magnetic field is not applied, which is called the anomalous Hall effect.
The team fabricated a donut-shaped disk made of layers of different magnetic topological insulators . They then measured how the electric current through the device responded to an alternating magnetic field generated by metal electrodes on the inner and outer curves of the donut.
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