Quantum crystals abound in the whole range of solid-state species. Below a certain
threshold temperature the physical behavior of rare gases (He 4 and Ne), molecular solids …

Monte Carlo techniques have played an important role in understanding strongly correlated
systems across many areas of physics, covering a wide range of energy and length scales …

We study different solid phases of He 4, by means of path integral Monte Carlo simulations
based on a recently developed worm algorithm. Our study includes simulations that start off …

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 …

accepted July 30, 2008; published November 10, 2008) The possibility of a supersolid state
of matter, ie, a crystalline solid exhibiting superfluid properties, first appeared in theoretical …

It is pointed out that the simulation computation of energy performed so far cannot be used to
decide if the ground state of solid He 4 has the number of lattice sites equal to the number of …

We have computed the one-body density matrix ρ 1 in solid He 4 at T= 0 K using the shadow
wave-function (SWF) variational technique. The accuracy of the SWF has been tested with …

We have studied static and dynamical properties of superfluid 4 He at T= 0 K in the pressure
range from− 6 up to 87 atm well above freezing into the metastable region. Zero temperature …

We have performed a microscopic study of a straight quantized vortex line in three
dimensions in condensed He 4 at zero temperature using the shadow path integral ground …

Theory of superfluid He 4 shows that, due to strong correlations and backflow effects, the
density profile of a vortex line has the character of a density modulation and it is not a simple …