Polariton lasers emit coherent monochromatic light through a spontaneous emission
process. As a rare example of a system in which Bose–Einstein condensation and …

The topological properties of an object, associated with an integer called the topological
invariant, are global features that cannot change continuously but only through abrupt …

A photonic topological insulator features robust directional propagation and immunity to
defect perturbations of the edge/surface state. Exciton-polaritons, that is, the hybrid …

Topological insulators—materials that are insulating in the bulk but allow electrons to flow
on their surface—are striking examples of materials in which topological invariants are …

Polaritons are quasiparticles that form in semiconductors when an elementary excitation
such as an exciton or a phonon interacts sufficiently strongly with light. In particular, exciton …

Layered materials can be assembled vertically to fabricate a new class of van der Waals
heterostructures a few atomic layers thick, compatible with a wide range of substrates and …

Moiré patterns are common in van der Waals heterostructures and can be used to apply
periodic potentials to elementary excitations. We show that the optical absorption spectrum …

Topological photonics is a rapidly emerging field of research in which geometrical and
topological ideas are exploited to design and control the behavior of light. Drawing …

Topological photonics in strongly coupled light-matter systems offer the possibility for
fabricating tunable optical devices that are robust against disorder and defects. Topological …

Semiconductor microcavity polaritons, formed via strong exciton-photon coupling, provide a
quantum many-body system on a chip, featuring rich physics phenomena for better photonic …