Time-resolved, pulsed terahertz spectroscopy has developed into a powerful tool to study
charge carrier dynamics in semiconductors and semiconductor structures over the past …

We review pioneering and recent studies of the conductivity of solid state systems at
terahertz frequencies. A variety of theoretical formalisms that describe the terahertz …

We report a comprehensive experimental study and detailed model analysis of the terahertz
dielectric response and density kinetics of excitons and unbound electron-hole pairs in …

Lasers are usually described by their output frequency and intensity. However, laser
operation is an inherently nonlinear process. Knowledge about the dynamic behaviour of …

Metal halide perovskites have proven to be excellent light-harvesting materials in
photovoltaic devices whose efficiencies are rapidly improving. Here, we examine the …

The 1 s exciton—the ground state of a bound electron-hole pair—is central to understanding
the photoresponse of monolayer transition metal dichalcogenides. Above the 1 s exciton …

Two-dimensional Ruddlesden–Popper hybrid lead halide perovskites have become a major
topic in perovskite optoelectronics. Here, we aim to unravel the ultrafast dynamics governing …

Intense multiterahertz fields of order megavolts per centimeter are used to coherently
promote optically dark and dense paraexcitons in Cu 2 O from the 1 s into the 2 p state. The …

We employ optical pump-THz probe measurements to study the formation of excitons and
electron-hole plasmas following photogeneration of a hot electron-hole gas in the direct gap …

Condensation of bosons causes spectacular phenomena such as superfluidity or
superconductivity. Understanding the nature of the condensed particles is crucial for active …