Coulomb drag is a transport phenomenon whereby long-range Coulomb interaction
between charge carriers in two closely spaced but electrically isolated conductors induces a …

The condensation of excitons, bound electron-hole pairs in a solid, into a coherent collective
electronic state was predicted more than 50 years ago. Perhaps surprisingly, the …

We argue that spin-and valley-polarized metallic phases recently observed in graphene
bilayers and trilayers support chiral edge modes that allow spin waves to propagate …

Quantum wells (QWs) constitute one of the most important classes of devices in the study of
two-dimensional (2D) systems. In a double-layer QW, the additional “which-layer” degree of …

The fully spin-polarized composite-fermion (CF) Fermi sea at the half-filled lowest Landau
level has a Fermi wave vector k F*= 4 π ρ e, where ρ e is the density of electrons or …

We study the entanglement spectra of bilayer quantum Hall systems at total filling factor ν= 1.
In the interlayer-coherent phase at layer separations smaller than a critical value, the …

We demonstrate that counterflowing electrical currents can move through the bulk of the
excitonic quantized Hall phase found in bilayer two-dimensional electron systems (2DES) …

Experiments aimed at demonstrating Bose‐Einstein condensation of excitons in two types of
experiments with bilayer structures (coupled quantum wells) are reviewed, with an emphasis …

We study the phase diagram of quantum Hall bilayer systems with total filing ν T= 1/2+ 1/2 of
the lowest Landau level as a function of layer distances d. Based on numerical exact …

Three-dimensional topological insulators have protected Dirac-cone surface states. In this
Letter we argue that gapped excitonic superfluids with spontaneous coherence between top …