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Laser-induced tuning of pairs of lifetime-limited organic emitters allows the controlled creation of superradiant and subradiant entangled states.

The authors image non-equilibrium exciton phase-transition dynamics in moiré superlattices, revealing how strong long-range dipolar repulsion freezes the motion of the Mott insulator over a timescale of tens of nanoseconds.

The interplay between coherent wave-like and incoherent particle-like transport can lead to environment-assisted quantum transport. Using time resolved microscopies and theoretical modeling, the authors show signatures of this enhanced transport regime in perovskite nanocrystal superlattices.

The emergence of moiré superlattices in twisted two-dimensional halide perovskites has been reported, revealing the emergence of localized bright excitons with enhanced emissions and trapped charge carriers.

Two-dimensional hybrid perovskites have gained substantial interest recently due to their controllable optoelectronic properties; however precise control over layer thickness has been synthetically challenging. Now a crystal growth method is shown to achieve high-quality single crystals of organic semiconductor-incorporated perovskites with control over their thickness and length through judicious solvent choice, affording precisely tuned optoelectronic properties.

Exciton–exciton annihilation is conventionally assumed to be limited by diffusion. Now, using time-resolved photoluminescence microscopy to determine exciton diffusion constants and annihilation rates in two substituted perylene diimide aggregates, along with a microscopic model, it has been shown that annihilation can be suppressed through quantum interference of the spatial phase of delocalized excitons.

Determining the mechanism of charge carrier transport in solar cells is important for their development towards higher efficiencies. Here, the authors elucidate the spatial and temporal diffusion of charge carriers in hybrid perovskite thin films through ultrafast transient absorption microscopy.

Interlayer exciton dynamics in a van der Waals heterostructure is found to be modulated by the twist angle between the atomically thin layers, elucidating the effect of moiré potentials on exciton motion and providing guidelines to design quantum photonics devices based on 2D materials.

Two-dimensional hybrid perovskites are promising excitonic materials; however, there currently lacks understanding on exciton diffusion and annihilation. Here Deng et al. employ transient absorption microscopy to disentangle quantum-well-thickness-dependent exciton transport and annihilation in these materials.

Understanding the interplay between singlet fission and exciton transport is important if singlet-fission materials are to be used for solar cell applications. Now, a cooperative singlet–triplet transport mechanism has been revealed through ultrafast transient absorption microscopy.

Using low-temperature scanning tunnelling microscopy on a MoSe₂/few-layer graphene heterostructure enables localized exciton generation and mapping with atomic-scale spatial resolution.

A chemical dedoping technique is introduced to mitigate excessive electron doping in molecular cation intercalated MoS₂, producing a stable bulk monolayer material with monolayer-like optical properties but a much larger optical cross-section.

The authors unveil the many-particle processes underpinning the formation of bound charge transfer excitons at the interface of hBN-encapsulated lateral MoSe₂-WSe₂ heterostructures. The excitons can be tuned via interface (i.e. high quality lateral junction) and dielectric (i.e. hBN encapsulation) engineering.

Quasi-2D halide perovskites are attracting increasing attention for light-emitting devices. Here, the authors demonstrated efficient and stable quasi-2D perovskite LEDs enabled by suppressed phase disproportionation with newly designed organic ligands.

A solution-processing step has been used to prepare quantum-well structures that comprise a thin layer of perovskite sandwiched between two layers of conjugated oligothiophene derivatives. The band gap of the resulting 2D hybrid perovskites can be fine-tuned by functionalizing the organic component, which also improves the stability of the system.