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 …

We consider charge transport properties of 2+ 1 dimensional conformal field theories at
nonzero temperature. For theories with only Abelian U (1) charges, we describe the action of …

The low-energy physics of fractional quantum Hall (FQH) states—a paradigm of strongly
correlated topological phases of matter—to a large extent is captured by weakly interacting …

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 …

We discuss the effect of dissipation on quantum phase transitions. In particular, we
concentrate on the superconductor to insulator and quantum Hall to insulator transitions. By …

I review the concept of a disorder operator, introduced originally by Kadanoff in the context
of the two-dimensional Ising model. Disorder operators acquire an expectation value in the …

The quantum anomalous Hall (QAH) effect in a magnetic topological insulator (TI)
represents a new state of matter originating from the interplay between topology and …

The general theoretical definition of an insulator is a material in which the conductivity
vanishes at the absolute zero of temperature. In classical insulators, such as materials with a …

Motivated by the appearance of a “reflection symmetry” in transport experiments and the
absence of statistical periodicity in relativistic quantum field theories, we propose a series of …