Cesium atoms shaken, not stirred, to create elusive excitation in superfluid

5 febrero 2015

In 1941, future Nobel laureate Lev Landau predicted that superfluid helium-4 should contain an exotic, particle-like excitation called a roton. Roton structure has been a matter of debate ever since. Physicists have now created roton structure in the laboratory.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/OX2qsRZnSgs/150205141233.htm