This paper reviews the recent theoretical and experimental advances in the study of ultra-
cold gases made of bosonic particles interacting via the long-range, anisotropic dipole …

A solid is called'supersolid'if it exhibits superfluid properties. Supersolidity is a paradoxical
phenomenon whose understanding has become a major challenge since 2004, when Kim …

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We have confirmed the existence, as first reported by Kim and Chan, of a supersolid state in
solid 4He at temperatures below 250 mK. We have employed a torsional oscillator cell with …

We report torsional oscillator supersolid studies of highly disordered samples of solid He 4.
In an attempt to approach the amorphous or glassy state of the solid, we prepare our …

Solid He 4 has been created off the melting curve by growth at a nearly constant mass via
the “blocked capillary” technique and growth from the He 4 superfluid at constant …

For nearly half a century the supersolid phase of matter has remained mysterious, not only
eluding experimental observation, but also generating a great deal of controversy among …

The nonclassical rotational inertia fraction of the identical cylindrical solid He 4 below 300
mK is studied at 496 and 1173 Hz by a double resonance torsional oscillator. Below 35 mK …

We investigate the physics of dipolar bosons in a two-dimensional optical lattice. It is known
that due to the long-range character of dipole-dipole interaction, the ground state phase …

Here we provide an overview of the status of the field of solid 4 He with a focus on the recent
theoretical and experimental activities stimulated by the 2004 experiments of Kim and Chan …