We use state of the art theoretical and computational techniques and
tools to study various equilibrium
as well as dynamical properties of quantum systems confined in restricted
dimensionality
(such as the one of film) or in restricted geometries.
During the past year we have found a number of very interesting properties
of such systems
where simple and well known van der Waals forces govern the atom-atom
interactions.
The growth of the most idealized films, such as those of hydrogen and
helium on various
substrates where the growth parameters are under control, provides
us the understanding
of the growth process for more complicated quantum films.
For example for the case of helium or hydrogen films, as a function
of the coverage
of helium or hydrogen we can explain several features of the measured
and calculated
specific heat, compressibility, superfluid density. The films
goes through a number of
very different phases such as various commensurate solids, incommensurate
solids,
superfluid phases, two-dimensional clusters, etc. The onset of these
phases, the
promotion densities, the peaks of the specific heat, the behavior of
the period shifts
in the torsional oscillator experiments are all reproduced in excellent
agreement with
experiment starting from the known values of fundamental constants
and with no free
parameter. We shall continue these studies mainly for hydrogen
on graphite
where there are interesting experimental results and for helium on
graphite
preplated by a few layers of hydrogen.