Open quantum systems (OQSs) cannot always be described with the Markov approximation,
which requires a large separation of system and environment time scales. An overview is …

Spaser is an acronym for surface plasmon amplification by stimulated emission of radiation.
A spaser is effectively a nanoscale laser with subwavelength dimensions and a low-Q …

Atomically thin layered two-dimensional (2D) materials have provided a rich library for both
fundamental research and device applications. Bandgap engineering and controlled …

We discuss the photoluminescence (PL) of semiconducting transition metal dichalcogenides
on the basis of experiments and a microscopic theory. The latter connects ab initio …

Nanoscale semiconductor lasers have been developed recently using either metal, metallo-
dielectric, or photonic crystal nanocavities. While the technology of nanolasers is steadily …

Light is often characterized only by its classical properties, like intensity or coherence. When
looking at its quantum properties, described by photon correlations, new information about …

Reliable technologies for the monolithic integration of lasers onto silicon represent the holy
grail for chip-level optical interconnects. In this context, nanowires (NWs) fabricated using III …

Lasers are recognized for coherent light emission, the onset of which is reflected in a
change in the photon statistics. For many years, attempts have been made to directly …

This review addresses ongoing discussions involving nanolaser experiments, particularly
those related to thresholdless lasing or few-emitter devices. A quantum-optical (quantum …

In a coupled quantum-dot–nanocavity system, the photoluminescence from an off-
resonance cavity mode exhibits strong quantum correlations with the quantum-dot …