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Fractional Fermi Sea
July 8 , 2026
7 hrs 0 min
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- Scientists at the University of Innsbruck created a new exotic quantum state of matter called the fractional Fermi Sea.
- The experiment used around 70,000 caesium atoms cooled to a few nanoKelvin and trapped in one-dimensional tubes to control particle movement.
- A fractional Fermi Sea is a quantum state formed under ultracold conditions, where particles show unusual collective behaviour.
- The discovery explores quantum behaviour beyond the Tomonaga–Luttinger liquid theory, which describes interacting particles in one dimension.
- Caesium (Cs), used in the experiment, is an alkali metal with atomic number 55.
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