Physicists have captured an extraordinary quantum phenomenon in which electrons appear to leap across energy gaps that would normally be off limits. Using a new type of slow-motion electron camera, researchers were able to watch these incredibly fast movements in graphene, revealing how powerful electric fields can drive electrons between different energy states.
The effect is similar to stepping into an elevator and watching the floor display change from "1," "2," and "3" directly to "20." Instead of traveling through the seventeen floors in between, you somehow arrive at the twentieth floor. Although this sounds impossible in everyday life, electrons can make comparable jumps in the quantum world.
These unusual events are known as Landau-Zener-Majorana transitions. Physicists have long suspected that they could become increasingly important in high-speed semiconductor electronics, but observing exactly how they unfold has been a major challenge.
Now, researchers from the University of Regensburg, Philipps-Universität Marburg, and Forschungszentrum Jülich have directly tracked these transitions in graphene, a material made from an extremely thin layer of carbon atoms. Their findings, published in Nature, provide a detailed look at how electrons respond to intense electric fields generated by light.
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