Among very-low-disorder systems of condensed matter, the high-mobility two-dimensional
electron gas (2DEG) confined in aluminum gallium arsenide (AlGaAs)–gallium arsenide …

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 …

In an ultraclean 2D electron system (2DES) subjected to crossed millimeterwave (30–150
GHz) and weak (B< 2 k G) magnetic fields, a series of apparently dissipationless states …

Because graphene is an atomically two-dimensional gapless semiconductor with nearly
identical conduction and valence bands, graphene-based bilayers are attractive candidates …

At total Landau level filling factor ν tot= 1 a double-layer two-dimensional electron system
with small interlayer separation supports a collective state possessing spontaneous …

Coulomb drag is a process whereby the repulsive interactions between electrons in spatially
separated conductors enable a current flowing in one of the conductors to induce a voltage …

This paper reviews progress on the fractional quantum Hall effect (FQHE) based on what we
term Hamiltonian theories, ie, theories that proceed from the microscopic electronic …

Among the many examples of Bose condensation considered in physics, electron–hole-pair
(exciton) condensation has maintained special interest because of controversy about …

The frictional drag between parallel two-dimensional electron systems has been measured
in a regime of strong interlayer correlations. When the bilayer system enters the excitonic …

Measurements revealing anomalously large frictional drag at the transition between the
weakly and strongly coupled regimes of a bilayer two-dimensional electron system at total …