The topological and catalytic properties of gold iodide monolayers are investigated using first-principles calculations by Prafulla K. Jha and colleagues in article number 2100657. The non-trivial topology and catalytic activity are at the core of this work offering insights into potential applications of gold iodide monolayers.

Mixed-halide perovskites are tunable photoabsorbers and emitters because of their compositional-dependent properties. This perspective provides a meticulous understanding of the critical views on how the mixed-halide perovskites are going to be the cutting-edge next-generation materials, focusing on the implications that have become seemingly difficult to extrapolate and predict the realistic performance of optoelectronic devices in working conditions.

The oxygen introduction can strongly affect magnetic structure, and significantly enhance room-temperature magnetic response for cobalt selenides. The difference in bonding interaction between CoO bonds and CoSe bonds induces electronic reconfiguration in cobalt selenides, altering room-temperature ferromagnetism. This experimental observation can provide a new insight into the role of oxygen incorporation onto magnetic structure transformation.

The world's first homojunction UV light-emitting diode (LED) based on both p-type and n-type ZnO nanoparticles (NPs) is demonstrated. Nitrogen-doped ZnO and gallium-doped ZnO NPs are provided to fabricate p-type and n-type NP layers, respectively. The LEDs with these layers show near UV electroluminescence and it can be confirmed that the holes inject from p-type layer to n-type layer.

The concentration of C-centers in several diamond plates is measured. The influence of the free precession time of the nitrogen-vacancy (NV) center on the contrast in the double electron–electron resonance spectrum is investigated. The optimal free-precession time is determined for each C-center concentration, showing a strong correlation with both the concentration of C-centers and the NV-center coherence time.

Magneto-thermoelectric effects in a ferromagnetic nanowire enable us to evaluate the 3D heat flow inside the ferromagnetic nanowire and provide the evidence for the significant heat flow through the substrate.

The Fe- and Co-doped tungsten disulfide monolayers are ferromagnetic half-metals with the out-of-plane easy magnetization axis at room temperature. The magnetic anisotropic energy of Fe:WS₂ can be larger than 16 meV cell⁻¹ under −4% compressive strain. The strain effect on the Curie temperature is also discussed.

Thermal and optical properties of BaSnS₂ are reported for the first time. The herein described analyses show that it is a direct, wide bandgap material (2.4 eV) with a Debye temperature of 198 K and low-frequency Einstein modes at 59 K. The herein described findings lay the foundation for understanding the physical properties of this material.

The statistics of nucleation and growth of individual biatomic monolayers in self-catalyzed GaAs nanowires are investigated quantitatively by combining in situ transmission electron microscopy and modeling. When the catalyst droplet is very poor in As, a self-regulated growth regime arises at relatively low growth temperature, despite the stochasticity of the nucleation events.

Quantum transport properties of the transition-metal dichalcogenide superconductor 1T-NbSeTe are investigated. The single crystal shows a resistivity upturn at low temperatures before entering the superconducting state. The characteristics of the upturn and the magnetoresistance behavior reveal disorder-enhanced electron–electron interaction and strong spin-orbit coupling-induced weak antilocalization effect. In addition, the material shows anomalous disorder-enhanced superconductivity, calling for further understanding.

The ZnO and NiO stacking films are prepared by sol–gel spin-coating to explore the impact of bending on device resistive switching. Fatigue life analysis of bent sample is studied to predict the fracture position and to validate the cycle failure times, a modified compliance calibration method is reported to determine the film breakdown threshold.

Layered MoSi₂N₄ is proposed as an electrode material of Zn–air battery. As the anode and the Zn storage material, a phase transition from state I to state III occurs in MoSi₂N₄ with increasing Zn loading. With MoSi₂N₄ as the cathode, the two-electron mechanism of O₂ reduction to ZnO₂ is more efficient than general sluggish four-electron aqueous O₂ redox reactions.

Herein, multicolor invisible patterns encrypted in double-inverse opal films based on thermally induced structural deformation for anti-counterfeiting applications are prepared. The current film material can reveal different patterns on the front and back sides during the solvent-responsive decryption, and simultaneously the overlapping part of the patterns can achieve color mixing based on the bilayer structure.