Issues

A solid that one can produce by simply applying pressure to liquid helium‐4 is an excellent medium for studying the appearance of facets, the kinetics of crystal growth and other fundamental problems of surface physics.

At low densities solid helium exhibits two distinct magnetically ordered phases that are easily accessible with present technology; studies of these systems are enhancing our understanding of nuclear magnetism and atomic exchange in quantum solids.

Two‐dimensional arrays of charged particles exhibit plasma oscillations and phase transitions such as crystallization and melting in the low‐density classical limit, but their high‐density quantum regime remains to be explored.

Singular whirlpools give rise to such diverse phenomena as superfluid turbulence, two‐dimensional phase transitions and quantum nucleation.

Completely novel continuous vortices in $He3‐A$ and spontaneously magnetized singular vortices in $He3‐B$ are just two of the many interesting peculiarities of rotating superfluid $He3.$