QAH insulators as legos (IMAGE)
Caption
A team of researchers from Penn State has experimentally demonstrated a quantum phenomenon called the high Chern number quantum anomalous Hall (QAH) effect. They stacked alternating layers of magnetic and non-magnetic topological insulators, illustrated here as stacked Legos, and manipulated a topological quantity called the Chern number (C) to create as many as 5 parallel highways for electrons on each side of the material. Bottom: experimental results demonstrating the QAH effect with Chern number of 1 to 5.
Credit
Zhao et al., Nature
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