Observation of superfluidity in a strongly correlated two-dimensional Fermi gas
Lennart Sobirey, Niclas Luick, Markus Bohlen +3 more
Finding the breaking point A superfluid can flow without viscosity but only if the speed of the flow is lower than the so-called critical velocity. Sobirey et al. measured the critical velocity of a system of ultracold fermionic atoms confined to two dimensions. The researchers trapped a gas of lithium-6 atoms in a box-shaped potential and then moved another, periodic potential through the trap. The response of the gas to this perturbation showed a sudden increase when the speed of the periodic potential reached the critical velocity. Science , abc8793, this issue p. 844
arXiv:2005.07607•Science•May 21, 2021•52 citations