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The emission of entangled photon pairs from layered materials is attractive for quantum applications, but its observation in monolayers has remained elusive. Here, the authors report co- and counter-propagating photon pair emission in the telecom range from monolayer GaSe and the observation of high-fidelity Bell states in the counterpropagating configuration.

Nanomechanical resonators are attractive as ultra-low concentration sensors of biomolecules, as their small scale allows for sensitive mass detection. Here, using a nanowire array as part of a photonic crystal, such a device is presented for light trapping, absorption and low-concentration sensing.

Quasi-phase matching (QPM) is a well-known technique to improve the efficiency of frequency conversion processes in 3D nonlinear optical materials. Here, the authors report the implementation of nanoscale QPM in 2D 3R-stacked twisted MoS₂, showing enhanced second harmonic generation and spontaneous parametric down-conversion.

A photoresist-free patterning technique enables scalable fabrication of two-dimensional heterostructures while preserving the electronic properties of the underlying layers.

Plateau’s law describes the configuration (joint angles ~120°) of soap bubbles, foams and cellular structures, but its applicability to solid films has not been explored. Here, the authors report the observation of a variant Plateau’s law in networks of nanobubbles made of 2D semiconductors, measuring largely varying joint angles due to the thickness-dependent effective surface tension.

Reduced dielectric screening in a free-standing heterobilayer results in higher formation efficiency of interlayer excitons and leads to strongly enhanced dipole–dipole interactions, enabling the observation of many-body correlations at the quantum limit.

Spontaneous parametric down-conversion in thin films should allow to realise extremely compact entangled photon sources. Here, the authors generate entangled photon pairs from a 3R-MoS2 flake, characterize them via quantum state tomography, and show how to tune between different Bell state outputs by changing the pump polarization.

Bioelectronic devices enable real-time monitoring, diagnosis and treatment by blending biological processes with electronic technology. This Review examines the material property landscape of low-dimensional materials in bioelectronic systems by device component, emphasizing their role in enabling the development of miniaturized bioelectronic platforms for wireless and connected health-care applications.

It has been a long-standing challenge to produce air-stable few- or monolayer phosphorene. Here, the authors demonstrate a new highly controllable method for fabricating high quality, air-stable mono- and few-layer phosphorene films, enabling precise defect engineering in monolayer phosphorene.

Here the authors report binary phase supercritical lenses by patterning monolayer TMD materials. Through placement of atomic thin 2D TMD with sufficient absorption, a spot of critical coupling is created to facilitate a π phase jump and subdiffraction focusing over bandwidth of 150 nm in visible range.

Though high-index dielectric metasurfaces are attractive due to their nonlinear effects, channelling of 2^nd and 3^rd harmonic generation into a single beam remains a challenge. The authors addressed this using transition-metal-dichalcogenide metasurfaces with tunable nonlinear emission direction.

Directional excitation of ghost hyperbolic phonon polaritons is achieved using an asymmetric antenna, enabling long-range propagation and tunable control for mid-IR nanophotonic applications.

Here, the authors investigate the interactions between Fermi polarons in monolayer WS₂ by multi-dimensional coherent spectroscopy, and find that, at low electron doping densities, the dominant interactions are between polaron states that are dressed by the same Fermi sea. They also observe a bipolaron bound state with large binding energy, involving excitons in different valleys cooperatively bound to the same electron.

The potential of 2D materials for space applications has been surfaced recently, however a comprehensive assessment of their suitability is currently missing. Here, the authors investigate the radiation effects in Earth’s atmosphere on various devices based on 2D transition metal dichalcogenides and hexagonal boron nitride.

Dipolar many-body systems provide a promising platform to study quantum phases and exotic phenomena such as dipolar liquids, dipolar solids and superfluids. This Review discusses dipolar many-body complexes and their interactions in 2D stacked transition metal dichalcogenide heterobilayers and offers insights into the unique properties of various exciton species.

An innovative multi-step facet engineering approach was developed to achieve InGaAs/InP quantum well nanowire arrays with conttolled dimensions, uniform morphology and high crystal quality, enabling low-threshold lasing in the telecom-band.