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

This review is devoted to the theory of electron-hole superfluidity in bilayer systems. This is a
discussion of the state in which electrons and holes from adjacent layers form bound pairs …

Exciton bound states in solids between electrons and holes are predicted to form a
superfluid at high temperatures. We show that by employing atomically thin crystals such as …

An odd number of gapless Dirac fermions is guaranteed to exist at a surface of a strong
topological insulator. We show that in a thin-film geometry and under external bias, electron …

The high-temperature superfluidity of two-dimensional dipolar excitons in two parallel
transition metal dichalcogenide (TMDC) layers is predicted. We study Bose-Einstein …

We present numerical and analytical results for the optical and acoustic plasmon collective
modes of coupled massless-Dirac two-dimensional electron systems. Our results apply to …

Vertical heterostructures combining different layered materials offer novel opportunities for
applications and fundamental studies. Here we report a new class of heterostructures …

Abstract Fifty years ago Walter Kohn speculated that a zero-gap semiconductor might be
unstable against the spontaneous generation of excitons–electron–hole pairs bound …

We act on the suggestion that an excitonic insulator state might separate—at very low
temperatures—a semimetal from a semiconductor and ask for the nature of these transitions …

Exciton condensation in an electron-hole bilayer system of monolayer transition-metal
dichalcogenides is analyzed at three different levels of theory to account for screening and …