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Hexagonal boron nitride is a promising host for single-photon quantum emitters, but irreversible loss of emission by photobleaching hinders its practical use. Here, the mechanistic investigation of hBN emitters reveals two distinct photobleaching lifetimes, suggesting a way to mitigate the shorter, environmentally sensitive, bleaching process.
Direct imaging and tuning of flat band localization in kagome materials remains a challenge. Here, scanning tunneling microscopy and photoemission spectroscopy are used to study FeSn, revealing real-space localization and magnetic tuning of the flat band state within the Fe3Sn kagome lattice layer.
Lithium-metal batteries are hindered by their insufficient Coulombic efficiency and uncontrollable dendrite growth. Here, a multi-component jigsaw-like artificial solid electrolyte interphase was constructed that regulates lithium-ion transport and protects the reactive lithium metal.
LaTiO2N is a promising photocatalyst for light-driven water splitting. Here, ARPES is used to study the momentum-resolved electronic structure of the sub-surface region of LaTiO2N and monitor its evolution during the oxygen evolution reaction.
Brain-inspired neuromorphic computing is a key technology for processing an ever-growing amount of data. Here, an artificial synapse with dual resistance modulation mechanisms is demonstrated, achieving a dynamic range of 60, an endurance exceeding 1010 cycles, and more than 10 years of retention.
Magnetic refrigeration materials containing rare-earth ions are promising for hydrogen liquefaction and energy storage applications. Here, the role of crystal-field level splitting on magnetic entropy change is systematically investigated, comparing mean-field calculations with neutron scattering experiments in HoB2.
Nanocrystalline thin films fabricated by deposition often have high residual stresses, making them susceptible to defects. Here, stress distribution in tungsten-titanium nanocrystalline films are probed by experimental and simulation techniques, revealing the impact of solute concentration on residual stress.
Molecular motion in nanosized pores can be extremely complex. Here, NMR diffusion experiments in different relaxation windows and molecular dynamics simulations suggest an unusual dynamic molecular ordering when an ionic liquid is confined in nanoporous silica.
Defects are detrimental to the performance of MoS2 field-effect transistors. Here, the origin of defects from prolonged high-field operation is attributed to long-term electrical stress in the transistor ON state, which weakens the Mo-S bonds of the original crystal.
Bi-phasic O3/P2 sodium layered oxides are leading candidates for next-generation batteries but rational control of the O3/P2 ratio remains challenging. Here, the O3/P2 ratio is tuned by using the average ionic radius of the transition metal layer, leading to materials with different characteristics.
Beam oscillation is an attractive method to achieve melt pool and microstructure control in laser powder bed additive manufacturing. Here, in-situ X-ray imaging and high-fidelity modeling reveal the unique keyhole dynamics in a kHz laser oscillation mode.
Solution-processable organic thin-film transistors are needed for device applications. Here, solution-processed organic semiconductors and amorphous metal oxide semiconductors are integrated into a transistor, with five-stage complementary ring oscillators demonstrated.
Structural features control the thermal conductivity of a material by modulating phonon scattering. Here, simulations and theory reveal the effect that atomic-scale defects and pores have on the crossover of thermal transport regimes in graphene.
Modeling artificial nanostructures in terms of effective materials parameters is important for gaining physical insight into their behavior and facilitating their optimization. Here, an analytical effective medium theory for the heat capacity of holey phononic crystals is derived, revealing the effect of the emergent anisotropic elastic response of the metasolid.