Granular metals are arrays of metallic particles of a size ranging usually from a few to
hundreds of nanometers embedded into an insulating matrix. Metallic granules are often …

The quantum dynamics of tunnel junctions with very small capacitance, such that k BT< e
2/2C, is investigated. We derive the quantum mechanical description from the microscopic …

For a system at a temperature of absolute zero, all thermal fluctuations are frozen out, while
quantum fluctuations prevail. These microscopic quantum fluctuations can induce a …

Josephson-junction arrays are ideal model systems to study a variety of phenomena such as
phase transitions, frustration effects, vortex dynamics and chaos. In this review, we focus on …

Nanoparticles (NPs) are commonly referred to as “artificial atoms”, 1 as they can exhibit
atomic-like behaviors. The analogy is highlighted by a result that, just like atoms, electronic …

The zero-temperature phase diagram of the one-dimensional Bose-Hubbard model with
nearest-neighbor interaction is investigated using the density-matrix renormalization group …

The evolution of superconductivity in ultrathin films of Sn, Pb, Ga, Al, and In has been
examined as a function of thickness and temperature. The films were grown in increments by …

We develop a semi-quantitative theory of electron pairing and resulting superconductivity in
bulk “poor conductors” in which Fermi energy EF is located in the region of localized states …

Cascades are self-amplifying processes triggered by feedback mechanisms that may cause
a substantial part of a macroscopic system to change its phase in response to a relatively …

Abstract We use quantum Monte Carlo techniques to study the critical properties of an
interacting-boson model in one dimension. The phase diagram consists of a series of (Mott-) …