Insider Brief
Researchers reported that a driven one-dimensional gas of ultracold cesium atoms can be engineered into a highly ordered non-equilibrium quantum state known as a fractional Fermi sea.
The study shows that cyclically changing interactions between strongly repulsive and strongly attractive regimes can reorganize atoms into a highly excited state rather than simply heating the system.
The fractional Fermi sea displays correlation patterns that differ from Tomonaga-Luttinger liquids, suggesting a new exotic critical phase for cold-atom quantum simulation.
PRESS RELEASE — In a new study published in Physical Review Letters, a team of the Nägerl group jointly with theory collaborator Alvise Bastianello from the CNRS and the Université Paris-Dauphine demonstrates that highly unusual quantum states known as “fractional Fermi seas” can be quantum engineered.
