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The ultrafast carrier dynamics across the van der Waals interface of transition metal dichalcogenide heterostructures govern the formation and funnelling of excitons. Here, the authors demonstrate a reversible switch from exciton dissociation to exciton funnelling in a MoSe₂/WS₂ heterostructure, which manifests itself as a photoluminescence quenching-to-enhancement transition.

Interlayer coupling between two-dimensional materials is known to result in interesting physical properties. Here, the authors study the effect of a twist angle between two-dimensional molybdenum disulphide on interlayer coupling, observing an indirect bandgap, the size of which depends on the twist angle.

Owing to strong Coulomb interactions, atomically thin transition metal dichalcogenides host strongly bound excitonic complexes. Here, the authors report charge-neutral biexciton and negatively charged trion-exciton complexes in hBN encapsulated monolayer WSe₂ by employing low-temperature photoluminescence spectroscopy.

This study identifies copper homeostasis mechanisms in K. pneumoniae, revealing gene deletions reduce tolerance, virulence, and increase susceptibility.

Introducing spin–orbit coupling by substrate proximity effect leads to an enhancement of superconducting phases in rhombohedral trilayer graphene.

Graphene systems exhibit flavor order transitions driven by tuning parameters. Here, the authors demonstrate an optical technique for detecting flavor textures in graphene via the exciton response of a proximal transition metal dichalcogenide layer.

Undefined vacuole-like ultrastructures between epididymal cells have been observed. Here, the authors reveal that these structures contain organelle residues and protein aggregates that suggest a reservoir for protein recycling.

Strongly correlated insulating Mott and generalized Wigner phases are detected in WSe₂/WS₂ moiré superlattices, and their electrical properties and excited spin states are studied using an optical technique.

The long lifetime and spin properties of dark excitons in atomically thin transition metal dichalcogenides offer opportunities to explore light-matter interactions beyond electric dipole transitions. Here, the authors demonstrate that the coupling of the dark exciton and an optically silent chiral phonon enables the intrinsic photoluminescence of the dark-exciton replica in monolayer WSe₂

Itinerant magnetism in rhombohedral multilayer graphene shows a large excess entropy from magnetic fluctuations above its critical temperature—typically only associated with local moments—which implies the decoupling of charge and isospin degrees of freedom, and results in the isospin Pomeranchuk effect.

The mechanisms by which tillandsioids adapt to elevated aerial habitats remain largely unexplored. Here, the authors report their evolution and link life history, diversification, comparative genomic, and functional changes to processes underlying the unique biology of air plants.

A combination of exciton sensing and optical pump–probe spectroscopy is used to investigate the dynamics of isospin orders in MATBG with WSe₂ substrate across the entire flat band, achieving sub-picosecond resolution.

Moiré superlattice exciton states are observed in WSe₂/WS₂ heterostructures with closely aligned layers.

Stacked 2D materials can host excitons with distinct valley selection rules due to the spatial variation of the moiré pattern. The authors demonstrate this via optical spectroscopy, opening a route for control of optoelectronic devices.

Layer-stacking domain walls in bi- and trilayer graphene are engineered individually and moved, erased and mechanically split by means of an atomic force microscope tip.

A high-throughput optical imaging and spectroscopy technique has now been developed that characterizes the chirality and electronic structure of individual single-walled carbon nanotubes either on their growth substrate or in functional devices.

2D surface plasmon polaritons are used to probe the domain-wall solitons in bilayer graphene; near-field infrared nanoscopy reveals various domain-wall structures in mechanically exfoliated graphene bilayers.

The emergence of optically silent phonons show that strong interlayer electron–phonon coupling can arise in van der Waals heterostructures, with the vibrational modes in one layer coupling to the electronic states in a neighbouring layer.

Electrons in graphene have a pseudospin, but controlling this degree of freedom is challenging. Evidence now suggests that the moiré superlattices arising in two-dimensional heterostructures can be used to electrically manipulate pseudospins.

Two concentric carbon nanotubes don’t need to have a common finite unit cell. Absorption spectra of such incommensurate double-walled carbon nanotubes reveal strong hybridization of the electron wavefunctions — unusual for van der Waals-coupled structures. The observations can be rationalized by zone folding the electronic structure of twisted-and-stretched graphene bilayers.

Investigation of the electronic structure in few-layer phosphorene reveals optical transitions relevant for technologically important electronic and optoelectronic applications.

The charge transfer between two layers of different two-dimensional materials occurs at a much faster speed than expected, holding promise for efficient optoelectronic devices.

Control of correlated excitonic states is a key goal of modern optoelectronic physics. Here, the authors demonstrate filling- and field-tunable exciton valley-pseudospin orders in a moiré heterostructure.

An out-of-plane magnetic field is expected to strongly modify exciton-phonon interactions in atomically thin transitional metal dichalcogenides. Here, the authors show that the phonon-exciton interaction in monolayer WSe₂ lifts the inter-Landau-level transition selection rules for dark trions.

Optical anisotropy and electronic compressibility measurements are used to uncover stripe phases, where the rotational symmetry of charge density is spontaneously broken, in a two-dimensional semiconductor moiré superlattice.

Substitutional doping is well-established in traditional semiconductors but has not been extensively explored in two-dimensional semiconductors. Here, the authors investigate the structural and electronic effects of Nb doping in MoS₂ crystals.

This Review discusses recent experimental and theoretical efforts in electron dynamics in TMDC heterostructures and the relevance of these effects for potential applications in optoelectronic and valleytronic/spintronic devices.

The development of a magneto-optical imaging technique enables the real-time imaging and control of critical magnetic fluctuations in the single-layer ferromagnetic insulator CrBr₃.

The bandgap of bilayer graphene can be tuned with an electric field and topological valley polarized modes have been predicted to exist at its domain boundaries; here, near-field infrared imaging and low-temperature transport measurements reveal such modes in gapped bilayer graphene.