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Diffractive Imaging of Transient Electronic Coherences in Molecules with Electron Vortices.
Phys Rev Lett
February 2025
University of California San Diego, Department of Chemistry and Biochemistry, La Jolla, California 92093, USA.
Direct imaging of transient electronic coherences in molecules has been challenging, with the potential to control electron motions and influence reaction outcomes. We propose a novel time-resolved vortex electron diffraction technique to spatially resolve transient electronic coherences in isolated molecules. By analyzing helical dichroism diffraction signals, the contribution of electronic populations cancels out, isolating the purely electronic coherence signals.
View Article and Find Full Text PDFFluid Mechanical and Visible-Light-Driven Piezophotocatalysis in MoS/Carbon-Rich Carbon Nitride Heterostructures for Enhanced Green Energy Production and Environmental Remediation.
ACS Appl Mater Interfaces
March 2025
Department of Chemical Engineering, National Cheng Kung University, Tainan 701, Taiwan.
Molybdenum disulfide (MoS)/carbon-rich carbon nitride (TCN) heterostructure, a piezophotocatalyst sensitive to fluid mechanical energy and visible light, has been developed for green energy production and environmental remediation. The optimized MoS/TCN heterostructure exhibits an absorption edge at 520 nm, identical to that of TCN but significantly red-shifted compared with conventional carbon nitride. Piezopotential measurements via piezoelectric force microscopy demonstrate that the MoS/TCN heterostructure generates a much higher piezopotential response than TCN under the same applied voltage.
View Article and Find Full Text PDFMagneto-ionic vortices: voltage-reconfigurable swirling-spin analog-memory nanomagnets.
Nat Commun
February 2025
Departament de Física, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Rapid progress in information technologies has spurred the need for innovative memory concepts, for which advanced data-processing methods and tailor-made materials are required. Here we introduce a previously unexplored nanoscale magnetic object: an analog magnetic vortex controlled by electric-field-induced ion motion, termed magneto-ionic vortex or "vortion". This state arises from paramagnetic FeCoN through voltage gating and gradual N ion extraction within patterned nanodots.
View Article and Find Full Text PDFSurfing vortex rings for energy-efficient propulsion.
PNAS Nexus
February 2025
Graduate Aerospace Laboratories, California Institute of Technology, 1200 E California Blvd, Pasadena 91125, USA.
Leveraging background fluid flows for propulsion has the potential to enhance the range and speed of autonomous aerial and underwater vehicles. In this work, we demonstrate experimentally a fully autonomous strategy for exploiting vortex rings for energy-efficient propulsion. First, an underwater robot used an onboard inertial measurement unit (IMU) to sense the motion induced by the passage of a vortex ring generated by a thruster in a 13,000-L water tank.
View Article and Find Full Text PDFReversible long-range domain wall motion in an improper ferroelectric.
Nat Commun
February 2025
Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
Reversible ferroelectric domain wall movements beyond the 10 nm range associated with Rayleigh behavior are usually restricted to specific defect-engineered systems. Here, we demonstrate that such long-range movements naturally occur in the improper ferroelectric ErMnO during electric-field-cycling. We study the electric-field-driven motion of domain walls, showing that they readily return to their initial position after having traveled distances exceeding 250 nm.
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