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The device operation of quantum-well infrared photodetectors and quantum-cascade lasers rely on intersubband transitions — that is, transitions that occur between quantized states in quantum wells that are typically fabricated from different III–V semiconductor alloys. The combination of materials in these structures is limited by strict lattice-matching conditions, which may deteriorate the device performance. Owing to their design versatility, van der Waals quantum wells naturally formed in 2D materials heterostructures are not impaired by these restrictions. However, until now, intersubband transitions in van der Waals quantum wells have not been observed experimentally. Now, Schmidt et al. employ near-field local probing to spectrally resolve intersubband transitions in layered transition metal dichalcogenides (TMDs) providing the opportunity to study these phenomena in van der Waals quantum wells for future applications. The cover is the artist’s depiction of an optically excited van der Waals layered structure formed by terraced TMDs.
This Commentary discusses practical prospects of using electrical control of interlayer excitons in van der Waals heterostructures for high-temperature exciton condensation and valley–spin optoelectronics.
Magneto-photoluminescence experiments reveal the role of dark excitons in the formation of biexcitons and charged biexcitons in tungsten diselenide monolayers.
Engineered nanomaterials are often highly reactive and readily transform to new species. New modelling capabilities incorporate these transformations into estimates of environmental exposure concentrations and associated risks more accurately.
This Perspective discusses design strategies for engineering quantum behavior in electron quantum metamaterials based on van der Waals heterostructures
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.
This Review discusses the contemporary experimental and theoretical understanding of interlayer excitons in heterobilayers of transition metal dichalcogenides.
The group velocity and frequency of propagation of elastic waves in the radio-frequency domain can be controlled dynamically using arrays of nanoelectromechanical oscillators.
Experimental observation of intersubband transitions in van der Waals quantum wells is enabled by high spatial resolution imaging through near-field optical microscopy.
Active dielectric nanoantenna arrays exhibit low-threshold and high-quality-factor directional lasing achieved via a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars.
A highly conductive, biocompatible and stretchable nanocomposite based on ultralong gold-coated silver nanowires allows for the realization of wearable and implantable bioelectronics.
Self-reconstruction of conducting nanostructures assisted by a dynamically crosslinked polymer network enables the fabrication of autonomous self-healable and stretchable multi-component electronic skin.
An ultrasensitive miRNA sensor based on gold-coated magnetic nanoparticles modified with redox-labelled probe DNA is capable of detecting miRNA at a concentration of 10 aM to 1 nM in unprocessed blood, and following tumour-induced variation in miRNA levels.
Gold nanoparticles typically considered inert in oxic waters accumulate in freshwater wetland subaquatic plants and are completely biotransformed to oxidized Au species by the associated cyanogenic biofilm.
Spikes on the surface of TiO2 microparticles, mimicking the nanotopological structures found on pathogens, boost the immune response in animal models and can be used to enhance the immunogenic effect of vaccines and adjuvants.