A closer look at “Physicists Freeze 'Necklace' of Atoms, Witness Quantum Phenomenon Predicted 100 Years Ago”, exactly as the source publishes it. In a breakthrough experiment, physicists have observed a quantum phenomenon predicted nearly a century ago by Nobel laureate Hans Bethe. By trapping atoms in a one-dimensional optical lattice and cooling them to near absolute zero, researchers at the Max Planck Institute of Quantum Optics and the University of Strasbourg created conditions where atoms bind into clusters known as Bethe strings. These exotic states, first theorized in 1931, occur when particles in a line cannot pass each other and instead form stable 'necklace-like' chains.
The team, led by Immanuel Bloch and Johannes Zeiher, used ultracold lithium-6 atoms and high-resolution microscopy to detect signatures of these strings. While the evidence is indirect, the findings, published in Nature, suggest a complex mixture of clusters of different lengths. This listing links straight to the original page, where the content is available in full.