Science, Space and Technology News 2024
Researchers have demonstrated how topological effects in an artificially constructed solid can be manipulated using magnetic fields to switch particle interactions on or off, potentially paving the way for advances in quantum technologies.
In a more abstract way, quantum systems in physics can also have a specific apple or doughnut topology, which manifests itself in the energy states and motion of particles. Researchers are very interested in such systems as their topology makes them robust against disorder and other disturbing influences, which are always present in natural physical systems.
The results of the ETH researchers as an homage to Andy Warhol. The image shows the experimental results of topological pumping. Credit: Quantum Optics Group / ETH Zurich But what if the screw hits an obstacle? In the experiment of the ETH researchers, that obstacle was an additional laser beam that restricted the freedom of movement of the atoms in the longitudinal direction. After around 100 revolutions of the screw, the atoms ran into a wall, as it were. In the analogy used above, the wall represents an apple topology in which topological pumping cannot take place.Surprisingly, the atoms didn’t simply stop at the wall, but suddenly turned around.
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