Article
Engineering, Mechanical
Zhi-Guo Liu, Jinliang Zhang, Yue-Sheng Wang, Guoliang Huang
Summary: In this paper, a pre-compressed one-dimensional granular crystal model is studied, and bright analytic single and multiple solitary wave solutions are derived. Two types of double-solitary waves are found in the model, and a possible method to determine the stability of multiple solitary waves is proposed. The results provide a theoretical basis for finding stable multiple solitary wave solutions.
NONLINEAR DYNAMICS
(2021)
Article
Acoustics
Dmitry Churochkin, Fernando Lund
Summary: The study investigates the coherent propagation and incoherent diffusion of in-plane elastic waves in a two-dimensional continuum populated by randomly oriented edge dislocations. The coupling between waves and dislocations is described by the Peach-Koehler force, leading to complex index of refraction and effective wave velocity. In the incoherent case, a Bethe-Salpeter equation is set up to calculate the diffusion coefficient explicitly at low frequencies.
Article
Engineering, Aerospace
Nansun Shen, Jinhui Jiang, Fang Zhang, Ming Ding
Summary: This paper proposes a discrete nonlinear elastic metamaterial and investigates its tunability in terms of amplitude and frequency. The theoretical derivation and numerical simulation confirm the tunability of this nonlinear elastic metamaterial.
Article
Mechanics
Roger J. Hosking, Fausto Milinazzo
Summary: This study extends the results of Miles & Sneyd on a simple linear mathematical model for an accelerating line load on a floating ice plate by conducting numerical calculations for the response due to a decelerating load. The results show various relationships between load speeds and deflections, with significances in certain scenarios where deflections may increase significantly.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Mechanics
Kai Luo, Qiu Wang, Jinping Li, Wei Zhao, Sangdi Gu
Summary: In this paper, an improved quasi-one-dimensional model for MHD flows is developed to efficiently calculate stagnation-streamline parameters in hypersonic MHD flows. Results show that the proposed model enables an efficient and reliable evaluation of stagnation-streamline quantities under hypersonic MHD flows.
Article
Mechanics
Shibin Cao, Jiaao Hao, Igor Klioutchnikov, Herbert Olivier, Karl Alexander Heufer, Chih-Yung Wen
Summary: This study investigates the flow characteristics of hypersonic flows over compression ramps with different leading-edge radii using numerical simulations and global stability analysis. The results show that increasing the leading-edge radius can suppress flow separation, reduce aerodynamic heating, and stabilize the flow system.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Acoustics
T. Dai, D. Kalyabin, S. A. Nikitov
Summary: This study focuses on the propagation of surface magnetoelastic waves in an inhomogeneous structure containing a ferromagnetic layer of smooth and slowly variable thickness. The dispersion relation and wave attenuation due to thickness variation were analytically obtained. The resonance frequency of magnetoelastic waves changes at different positions, and the modification of the magnetic field can control the resonance region.
Article
Mechanics
Vladimir M. Parfenyev, Sergey S. Vergeles
Summary: In the presence of strong background rotation, the velocity field tends to become quasi-two-dimensional, leading to an inverse energy cascade. Recent findings show that the radial velocity profiles of axisymmetric cyclones and anticyclones are described by a specific equation, but this theory did not account for boundary effects. The study demonstrates that for typical experimental conditions, the damping of the condensate is determined by linear Ekman friction associated with no-slip conditions at the lower and upper boundaries.
Article
Chemistry, Physical
Shihao Zhuang, Jia-Mian Hu
Summary: In this study, we computationally demonstrate the excitation of coherent sub-terahertz magnons in ferromagnetic and antiferromagnetic thin films by a photoinduced acoustic pulse. The emitted electromagnetic wave retains the spectral information of all the sub-THz magnon modes and can be detected in the near field.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Mechanics
R. W. Minich, D. A. Quint, E. B. Herbold, D. B. Bober, Mukul Kumar
Summary: Investigations of shock compression of heterogeneous materials often focus on the shock front width and overall profile. Recent observations have shown a pronounced shock-front width in particulate composites. This study investigates the mechanical interactions between phases to understand this behavior. Lie group analysis is applied to derive scaling laws for shock propagation, which are compared to experimental data.
Article
Materials Science, Multidisciplinary
Zhuang Li, Xiaotian Zhang, Zhenshan Zhai, Yangjian Cai, Xianyu Ao
Summary: A method is proposed to achieve narrow-linewidth resonance for electro-optic modulation by engineering quasibound states in a slab waveguide consisting of electro-optic polymer and metal gratings. The method allows for full resonance shift with minimal voltage and offers control over the radiation damping of the quasibound state by changing the relative position of the metal strips.
Article
Chemistry, Inorganic & Nuclear
Anastasiia Poltarak, Pavel Poltarak, Andrey Enyashin, Vladislav Komarov, Sofya Artemkina, Vladimir Fedorov
Summary: The synthesized binary niobium sulfide NbS4 was found to possess a unique crystal structure with specific niobium atom coordination within chains and distinct Nb...Nb contacts. Density functional theory calculations confirmed NbS4 as a thermodynamically stable compound and a nonmagnetic semiconductor, belonging to the family of quazione-dimensional compounds. This study discussed the synthesis, crystal structure, thermal stability, and lattice dynamics of NbS4, revealing its interesting electrophysical properties.
INORGANIC CHEMISTRY
(2022)
Article
Mechanics
Hang Zhou, Zhiguang Jin, Guoxing Zhuang, Chaogang Shi
Summary: The space-streamline-based method of characteristics (SMOC) is introduced as an inverse design method for three-dimensional supersonic flows. It integrates an additional algorithm for pressure gradients to determine the orientation of the osculating plane (OP) and adopts a conventional two-dimensional axisymmetric method for the OP. SMOC is able to solve inviscid super/hypersonic flows with specified flow features accurately and efficiently.
Article
Physics, Fluids & Plasmas
I. H. Hutchinson
Summary: This study theoretically demonstrates how to construct asymmetric electron holes in a plasma with asymmetric ion velocity distributions, providing consistent solutions for the one-dimensional Vlasov-Poisson equation. The equilibrium of the holes is generally unstable unless there is a local minimum in the ion velocity distribution, and the potential drop across the hole is shown to be related to the background ion velocity distribution and electron temperature. The potential asymmetry is small for holes with amplitudes typically observed in plasma environments.
Article
Multidisciplinary Sciences
Chi Li, Mengxue Guan, Hao Hong, Ke Chen, Xiaowei Wang, He Ma, Aiwei Wang, Zhenjun Li, Hai Hu, Jianfeng Xiao, Jiayu Dai, Xiangang Wan, Kaihui Liu, Sheng Meng, Qing Dai
Summary: This research demonstrates coherent ultrafast photoemission from a single quantized energy level of a carbon nanotube, which has a narrow energy spread and the potential to achieve subangstrom spatial resolution and femtosecond temporal resolution for electron probe.
Article
Physics, Applied
K. A. Omari, L. X. Barton, O. Amin, R. P. Campion, A. W. Rushforth, A. J. Kent, P. Wadley, K. W. Edmonds
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Multidisciplinary Sciences
Iaroslav A. Mogunov, Sergiy Lysenko, Anatolii E. Fedianin, Felix E. Fernandez, Armando Rua, Anthony J. Kent, Andrey Akimov, Alexandra M. Kalashnikova
NATURE COMMUNICATIONS
(2020)
Article
Multidisciplinary Sciences
Michal Kobecki, Alexey Scherbakov, Tetiana L. Linnik, Serhii M. Kukhtaruk, Vitalyi E. Gusev, Debi P. Pattnaik, Ilya A. Akimov, Andrew W. Rushforth, Andrey Akimov, Manfred Bayer
NATURE COMMUNICATIONS
(2020)
Article
Physics, Applied
F. Wang, C. L. Poyser, M. T. Greenaway, A. Akimov, R. P. Campion, A. J. Kent, T. M. Fromhold, A. G. Balanov
PHYSICAL REVIEW APPLIED
(2020)
Article
Biochemical Research Methods
Maria Giovanna Lizio, Zhiyu Liao, Dustin W. Shipp, Radu Boitor, Raluca Mihai, James S. Sharp, Matthew Russell, Hazem Khout, Emad A. Rakha, Ioan Notingher
Summary: The new technique combining auto-fluorescence spectral imaging and Raman spectroscopy allows for fast intraoperative assessment of excision margins in breast conserving surgery, providing information regarding tumor location within 45 minutes.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
G. Lioliou, C. L. Poyser, J. Whale, R. P. Campion, A. J. Kent, A. M. Barnett
Summary: A circular mesa GaAs p(+)-i-n(+) photodiode was characterized for its performance as a detector in photon counting x-ray spectroscopy. The new detector showed improved performance compared to an earlier detector made from the same epiwafer. Using the new detector and low noise readout electronics, an energy resolution of 750 eV 20 eV FWHM at 5.9 keV was achieved at 20 degrees C.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Multidisciplinary Sciences
D. M. Di Paola, P. M. Walker, R. P. A. Emmanuele, A. V. Yulin, J. Ciers, Z. Zaidi, J. -F. Carlin, N. Grandjean, I. Shelykh, M. S. Skolnick, R. Butte, D. N. Krizhanovskii
Summary: The authors demonstrate the giant nonlinearity of UV hybrid light-matter states (exciton-polaritons) in an AlInGaN waveguide, which can achieve ultrafast spectral broadening and offer promise for the development of a new generation of integrated UV nonlinear light sources.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Applied
C. E. Whittaker, T. Isoniemi, S. Lovett, P. M. Walker, S. Kolodny, V Kozin, I. Iorsh, I Farrer, D. A. Ritchie, M. S. Skolnick, D. N. Krizhanovskii
Summary: Opening a gap in the exciton-dominated part of the polariton spectrum is a promising first step towards the realization of quantum-Hall-like states arising from topologically nontrivial hybridization of excitons and photons. By etching square lattice arrays of shallow holes into the uppermost layer of the structure, gaps on the order of 10 meV are opened in the photonic mode dispersion, and their size and light-matter composition can be tuned by proximity to the strongly coupled exciton resonance. Gaps ranging from almost fully photonic to highly excitonic can be demonstrated.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Wenjing Yan, Andrey Akimov, Maria Barra-Burillo, Manfred Bayer, Jonathan Bradford, Vitalyi E. Gusev, Luis E. Hueso, Anthony Kent, Serhii Kukhtaruk, Achim Nadzeyka, Amalia Patane, Andrew W. Rushforth, Alexey Scherbakov, Dmytro D. Yaremkevich, Tetiana L. Linnik
Summary: Strain engineering using coherent phonons allows for the control of physical properties in 2D-vdW crystals, with the creation of flexural phononic crystals through periodic modulation of elastic coupling in vdW layers. Using an ultrafast pump-probe technique, we have successfully generated and detected these phonons, providing exciting prospects for ultrafast manipulation of states in 2D materials for emerging quantum technologies.
Article
Optics
Tintu Kuriakose, Paul M. Walker, Toby Dowling, Oleksandr Kyriienko, Ivan A. Shelykh, Phillipe St-Jean, Nicola Carlon Zambon, Aristide Lemaitre, Isabelle Sagnes, Luc Legratiet, Abdelmounaim Harouri, Sylvain Ravets, Maurice S. Skolnick, Alberto Amo, Jacqueline Bloch, Dmitry N. Krizhanovskii
Summary: Photonic platforms are ideal for quantum technologies due to weak photon-environment coupling and interactions between photons. This study demonstrates that the required nonlinearity can be achieved using exciton-polaritons in micropillars with embedded quantum wells, and observes the effect of cross-phase modulation.
Article
Optics
Anthonin Delphan, Maxim N. Makhonin, Tommi Isoniemi, Paul M. Walker, Maurice S. Skolnick, Dmitry N. Krizhanovskii, Dmitry V. Skryabin, Jean-Francois Carlin, Nicolas Grandjean, Raphael Butte
Summary: We observed polariton lasing in micro-ring resonators based on GaN/AlGaN slab waveguides in the UV spectral range, with stimulated polariton relaxation into multiple ring resonator modes. The strong exciton-photon coupling regime was confirmed by the reduction of the free spectral range and the blueshift of the exciton-like modes with increasing pulse energy. The absence of broadening in the exciton emission further confirmed lasing at low electron-hole densities. Overall, our work paves the way for the development of novel UV devices based on high-speed slab waveguide polariton geometry operating up to room temperature and integrated into complex photonic circuits.
Article
Chemistry, Physical
James S. Sharp, Nathaniel M. Roberts
Summary: This study investigates the thickness dependence of telephone cord blister formation in solvent swollen PDMS thin films. By recording videos and using Python for analysis, the correlation between the width of telephone cord blisters, the wavelength of sinusoidal corrugations, blister growth rate, and film thickness is determined.
Article
Chemistry, Analytical
Charles J. Lee, David J. Scurr, Long Jiang, Andrew Kenton, Shaun R. T. Beebe, James S. Sharp
Summary: A rotation stage was developed to image the surface of bullet casings in ultra-high vacuum conditions using ToF-SIMS, and experiments were conducted to study the changes of fingermarks over time. By analyzing thin strips along the length of the casings and comparing the resulting images to those developed with cyanoacrylate and BY40, it was found that ToF-SIMS images displayed finer details of the fingermarks. The effects of curvature of the round casings on fingermark morphology were assessed, and distortions caused by differences in surface curvature and deposition methods were found to be acceptable.
