In 1931, physicist Hans Bethe predicted that, in certain one-dimensional quantum systems, particles can bind together to form multi-particle states known as Bethe strings. Unlike ordinary molecules, which are held together by chemical bonds, Bethe strings arise purely from interactions between p...

Source: [Phys.org](https://phys.org/news/2026-09-ultracold-cesium-atoms-reveal-bethe.html)

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