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Lattice Anisotropy-Driven Reduction of Phonon Velocities in Black Phosphorus.
ACS Nano
January 2025
James Franck Institute, University of Chicago, Chicago, Illinois 60637, United States.
Phonon dynamics and transport determine how heat is utilized and dissipated in materials. In 2D systems for optoelectronics and thermoelectrics, the impact of nanoscale material structure on phonon propagation is central to controlling thermal conduction. Here, we directly observe in-plane coherent acoustic phonon propagation in black phosphorus (BP) using ultrafast electron microscopy.
View Article and Find Full Text PDFRupture phases reveal geometry-related rupture propagation in a natural earthquake.
Sci Adv
January 2025
Department of Earth and Environmental Sciences, The Chinese University of Hong Kong, Hong Kong, China.
Understanding and deciphering wiggles from seismograms has been a long endeavor to understand the internal structure of the Earth and to explore earthquake source properties. Here, we make an attempt to decipher the continuous rupture phases as large near-fault velocity pulses along the East Anatolian Fault in the 2023 moment magnitude () 7.8 Kahramanmaraş, Türkiye, earthquake.
View Article and Find Full Text PDFViscous fingering and interface splitting instabilities in air-water-oil systems.
J Colloid Interface Sci
January 2025
Department of Chemical and Petroleum Engineering, University of Calgary Calgary Alberta Canada. Electronic address:
Hypothesis: Viscous fingering instabilities of air displacing water displacing mineral oil is controlled by the air injection rate. Given the lower viscosity of the water, air would tend to finger through the water and then after it reaches the oil, proceed to finger through the oil.
Experiments: In a radial Hele-Shaw cell, experiments were conducted on air injection into mineral oil and air injection into a volume of water at the center of the cell which in turn is surrounded by mineral oil.
Quantum Dynamics Simulations of Exciton Polariton Transport.
Nano Lett
January 2025
Department of Chemistry, University of Rochester, Rochester, New York 14627, United States.
Recent experiments have shown that exciton transport can be significantly enhanced through hybridization with confined photonic modes in a cavity. The light-matter hybridization generates exciton-polariton (EP) bands, whose group velocity is significantly larger than the excitons. Dissipative mechanisms that affect the constituent states of EPs, such as exciton-phonon coupling and cavity loss, have been observed to reduce the group velocities in experiments.
View Article and Find Full Text PDFSmall fish, large variation: Morphological diversity of Weberian apparatus in Noturus catfishes and ecological implications.
Anat Rec (Hoboken)
January 2025
Department of Integrative Biology, University of California, Berkeley, California, USA.
The Weberian apparatus is a hearing specialization unique to the otophysan fishes, and an unexpected degree of morphological variation exists in species of the Noturus catfishes. Our aim in this study is to investigate relationships between morphological variations and ecology that may drive this variation. Sampling 48 specimens representing 25 species, we investigated morphological diversity and accounted for ecological variables using landmark-based 3D geometric morphometrics and x-ray-based computed tomography (CT) images.
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