For about 20 years, it has been the prevailing view that there can be no metallic state or
metal-insulator transition in two dimensions in zero magnetic field. In the last several years …

The interplay between strong Coulomb interactions and randomness has been a long-
standing problem in condensed matter physics. According to the scaling theory of …

The main theme of this review is the many-body physics of vortices in quantum droplets of
bosons or fermions in the limit of small particle numbers. Systems of interest include cold …

We describe the nature of charge transport at nonzero temperatures (T) above the two-
dimensional (d) superfluid-insulator quantum-critical point. We argue that the transport is …

The modern primary voltage standard is based on the ac Josephson effect and the ensuing
Shapiro steps, where a microwave tone applied to a Josephson junction yields a constant …

We report the transport properties of a low disorder two-dimensional hole system (2DHS) in
the GaAs/AlGaAs heterostructure, which has an unprecedentedly high peak mobility of 7× …

We discuss the recently discovered two-dimensional metal-insulator transition in zero
magnetic field in the light of the scaling theory of localization. We demonstrate that the …

Duality, the equivalence between seemingly distinct quantum systems, is a curious property
that has been known for at least three quarters of a century. In the past two decades it has …

We discuss superconductor to insulator and quantum Hall transitions which are of first order
in the clean limit. Disorder creates a nearly percolating network of the minority phase …

We describe general features of frequency-dependent charge transport near strongly
interacting quantum critical points in 2+ 1 dimensions. The simplest description using the …