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 …

With the advent of new synthesis and large-scale production technologies, nanostructured
gas-adsorbent materials (GAM) such as carbon nanocomposites and metal-organic …

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 …

Helium is recognized as a model system for the study of phase transitions. Of particular
interest is the superfluid phase in two dimensions. We report measurements on superfluid …

We have performed path-integral Monte Carlo calculations to study 4 He adsorption on a
single graphene sheet. The 4 He-substrate interaction was assumed to be a pairwise sum of …

Atoms deposited on atomically thin substrates are a playground for exotic quantum many-
body physics due to the highly tunable, atomic-scale nature of the interaction potentials. The …

The low-temperature phase diagram of 4 He adsorbed on a single graphene sheet is
studied by computer simulations of a system consisting of nearly a thousand helium atoms …

An exciting development in the field of correlated systems is the possibility of realizing two-
dimensional (2D) phases of quantum matter. For a system of bosons, an example of strong …

We revisited the phase diagram of the second layer of He 4 on top of graphite using
quantum Monte Carlo methods. Our aim was to explore the existence of the novel phases …

The classical and quantum structures of cationic polycyclic aromatic hydrocarbon molecules
(benzene, pyrene, coronene, and circumcoronene) coated by helium atoms have been …