Edge with a Twist: The Möbius Strip in the Quantum World ⚡ экспресс
Physicists have explored topological insulators with edge states that twist like a Möbius strip in momentum space. In new work, they gave these states an extra twist for the first time by hitting the material with periodic laser pulses—a technique called Floquet driving. As a result, the edge electronic bands acquired a double winding: around zero energy and around π energy, like a rhythm reflected from a time mirror. This finding not only expands the class of materials with unusual topology but also promises to create noise-resistant channels for quantum computing.
Some materials only conduct current on their surface—like an insulated wire. Now physicists have shown: if such a material is rapidly illuminated by a laser, surface electron waves twist into a quantum Möbius strip. This effect exists only while the light flickers: turn off the laser, and the twisted states vanish.
Periodic laser flashes create the conditions for these states to appear. They can be counted via entanglement entropy—a measure of quantum correlations. The most surprising part: the number of twisted strips can be any integer—like channels on an old TV. And each such state is immune to small defects: you can't untwist it without breaking the whole structure. In the future, this will help build quantum computers protected from noise.
🎯 You can tape together a paper Möbius strip in a minute. Its quantum twin is intangible—it lives in the description of electron waves, yet it can store information more reliably than many hard drives. Crumple the material however you like—the twisted state will survive.