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Spin-orbit interactions (SOIs) endow light with intriguing properties and applications such as photonic spin-Hall effects and spin-dependent vortex generations. However, it is counterintuitive that SOIs can exist for sound, which is a longitudinal wave that carries no intrinsic spin. Here, we theoretically and experimentally demonstrate that airborne sound can possess artificial transversality in an acoustic micropolar metamaterial and thus carry both spin and orbital angular momentum. This enables the realization of acoustic SOIs with rich phenomena beyond those in conventional acoustic systems. We demonstrate that acoustic activity of the metamaterial can induce coupling between the spin and linear crystal momentum k, which leads to negative refraction of the transverse sound. In addition, we show that the scattering of the transverse sound by a dipole particle can generate spin-dependent acoustic vortices via the geometric phase effect. The acoustic SOIs can provide new perspectives and functionalities for sound manipulations beyond the conventional scalar degree of freedom and may open an avenue to the development of spin-orbit acoustics.
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http://dx.doi.org/10.1038/s41467-021-26375-9 | DOI Listing |
Phys Rev E
January 2025
Joint Institute for High Temperatures, RAS, Izhorskaya 13 Bd.2, Moscow 125412, Russia.
An analysis of lattice wave spectra in a three-dimensional dusty plasma structure formed in a direct current gas discharge with alternating polarity under microgravity conditions is reported. The spectra are determined using the Fourier transform of microparticle velocities, measured by tracking microparticles with subpixel resolution. Both longitudinal and transverse modes are detected and analyzed.
View Article and Find Full Text PDFJ Neurointerv Surg
February 2025
Research Campus STIMULATE, Otto von Guericke University Magdeburg, Magdeburg, Germany.
Background: The proximity of transverse sinus stenosis (TSS) to inner ear structures and the temporal bone makes it a substantial cause of pulsatile tinnitus (PT). Treatment typically involves venous sinus stenting. This study investigates the hemodynamic stressors in TSS patients with PT along the pulse-transmitting temporal bone area and evaluates its treatment effects.
View Article and Find Full Text PDFPhys Rev Lett
January 2025
University of Otago, Dodd-Walls Centre for Photonic and Quantum Technologies, Dunedin 9054, New Zealand and Department of Physics, Dunedin 9016, New Zealand.
The honeycomb supersolid state is predicted to form in a dipolar Bose-Einstein condensate with a planar confining potential. Our results for its excitation spectrum reveal the gapless bands and the emergence of Dirac points at the Brillouin zone edge, manifesting as points where the second sound and transverse sound bands touch. The honeycomb supersolid has three sound speeds that we connect to its elastic parameters through hydrodynamic theory.
View Article and Find Full Text PDFFront Pediatr
January 2025
Department of Gastroenterology, Xi'an Children's Hospital, The Affiliated Children's Hospital of Xi'an Jiaotong University, Xi 'an, Shaanxi, China.
Introduction: Anomalous congenital bands are a rare cause of intestinal obstruction, with only five previously reported cases involving duodenal obstruction. We present a fifth case of duodenal obstruction due to two congenital bands and provide a comprehensive literature review summarizing the clinical features of this condition.
Case Report: An eight-year-old girl was admitted to our department with recurrent bilious vomiting and abdominal pain lasting six days.
Hear Res
March 2025
Columbia University Irving Medical Center, Department of Otolaryngology, Head and Neck Surgery, 180 Fort Washington Ave, New York, 10032, NY, USA; Columbia University, Department of Biomedical Engineering, 1210 Amsterdam Ave, New York, 10027, NY, USA.
Sound-evoked displacement responses at the outer hair cell-Deiters' cell junction (OHC-DC) are of significant interest in cochlear mechanics, as OHCs are believed to be in part responsible for active tuning enhancement and amplification. Motion in the cochlea is three-dimensional, and the architecture of the organ of Corti complex (OCC) suggests the presence and mechanical importance of all three components of motion. Optical coherence tomography (OCT) displacement measurements of OHC-DC motion from different experimental preparations often show disparate results, potentially due to OCT measuring only the motion component along the beam axis.
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