En supposant que l’administration Trump « arrive finalement à son terme, il pourrait falloir une décennie pour revenir au niveau où nous étions il y a six mois », estime le chercheur britannique de 83 ans, s’alarmant d’un « énorme problème ».

A nanofabrication method enabling the direct growth of plasmonic nanostructures are presented on suspended tapered optical nanofibers via Blurred Electron Beam Induced Deposition (BEBID). By defocusi...

Long-lived mechanical resonators like drums oscillating at MHz frequencies and operating in the quantum regime offer a powerful platform for quantum technologies and tests of fundamental physics. Yet,...

The directed assembly of molecules into micrometer-scale patterns and advanced materials holds broad relevance across fields such as life sciences, photovoltaics, and quantum photonics. However, these processes are often challenged by competing forces such as Brownian motion, capillary interactions, drift, and nonspecific adsorption. Here, we demonstrate a reactivated and guided diffusion mechanism of luminescent dye aggregates after encapsulation within boron nitride nanotubes (BNNTs). Correlative analyses between BNNT curvature and molecular positioning along the nanotube axis reveal efficient long-range migration of dye molecules from curved to straight sections of the BNNT. This curvature-activated diffusion leads to the formation of J-aggregate clusters, arranged in periodic patterns with precise spacings and defined lengths. A phenomenological model of curvature-guided molecular motility is developed to describe 1D diffusion within BNNTs, accurately predicting the size and spacing of J-aggregates as a function of the nanotube length. Finally, this mechanism is exploited using different substrates, such as exfoliated MoS2 topological steps or micropatterned gratings on the photonic device, to induce local bending of the BNNTs and deterministically control molecular cluster formation.

Gapless modes emerging from non-equilibrium phase transitions are predicted to diffuse rather than propagate as sound waves. Now, the diffusion of these modes and their suppression under symmetry brea...