International Journal of Physics | Vol. 14, No. 6, June 2023 | pp. 41–48
DOI: 10.46882/2023/IJP/000158
Research Article
Title: Squeezed Vacuum State Propagation and Photon Correlation Metrics in Disordered Optomechanical Resonators
Names of Authors: A. M. Ross¹, L. K. Rousseau²
Authors’ Affiliations:
¹ Department of Physics, University of Queensland, Brisbane, QLD 4072, Australia
² Laboratoire de Physique des Plasmas, École Polytechnique, Palaiseau, France
Abstract: Processing non-classical states of light within integrated optomechanical circuits is essential for scalable quantum communication networks and high-fidelity quantum transduction. This study models continuous-wave squeezed vacuum state propagation and characterises photon correlation metrics within a linear array of coupled microcavities subjected to spatial fabrication disorder. We solved the quantum stochastic Heisenberg-Langevin equations using an algebraic operator framework that accounts for localized optomechanical coupling variations, cavity mirror losses, and thermal phonon dephasing paths at 4.2 K. Squeezed vacuum states at 1550.0 nm were injected into the boundary port of a 15-channel network. The calculations demonstrate that introducing a minor 4.0% structural disorder in cavity resonance frequencies induces strong spatial localization of light, dropping the input squeezing level from 8.0 dB down to 2.4 dB over a 12.0 ps interaction window. To protect the quantum states, we simulated an active phase-modulation feedback loop that establishes a synthetic gauge field to suppress backscattering. The optimized circuit configuration restored the squeezing level to 6.8 dB, yielding a state fidelity calculation of 94.8% ± 0.3%.
Keywords: Quantum optics; squeezed states; optomechanics; Anderson localization; integrated photonics; phase stabilization
Manuscript Timeline: Received: March 02, 2023; Revised: April 14, 2023; Accepted: May 02, 2023; Published: June 16, 2023
Citation: Ross, A. M., & Rousseau, L. K. (2023). Squeezed Vacuum State Propagation and Photon Correlation Metrics in Disordered Optomechanical Resonators. International Journal of Physics, 14(6), 41–48.
International Journal of Physics | Vol. 14, No. 5, May 2023 | pp. 33–40
DOI: 10.46882/2023/IJP/000157
Research Article
Title: Finite Element Modeling of Acoustic Wave Scattering and Redirection in Active Piezocomposite Acoustic Metamaterials
Names of Authors: P. J. O’Connor¹, S. H. Zhang²
Authors’ Affiliations:
¹ Department of Civil and Environmental Engineering, University College Cork, Cork, Ireland
² Department of Physics, Tsinghua University, Beijing, China
Abstract: Controlling acoustic paths in structural and underwater environments is essential for adaptive noise insulation, structural wave management components, and seismic protection matrices. This study presents a finite element modeling framework to simulate acoustic wave scattering and track wave redirection profiles within active piezocomposite acoustic metamaterials. The design leverages a coordinate-transformation method applied to Biot's dynamic poroelastic equations to determine the required anisotropic distribution of density and elastic moduli tensors across the shell. We performed numerical scattering simulations across an ultrasonic frequency band from 20.0 kHz to 100.0 kHz. The computational models show that a cylindrical cloak constructed with 32 concentric sub-wavelength layers successfully routes an incident acoustic wave around a central cavity. This active configuration reduces the total scattering cross-section by 84.0% at a design frequency of 50.0 kHz. We analyzed the impact of electrical boundary configurations, demonstrating that adaptive inductive shunt routing modifies the effective bulk modulus tensor to accommodate shifts in fluid pressures. Experimental validation was carried out using 3D-printed perforated piezoceramic rings immersed in water, matching simulated fields within a tight ±4.8% error margin.
Keywords: Acoustic metamaterials; finite element modeling; wave redirection; Biot's theory; piezocomposites; active shunts
Manuscript Timeline: Received: February 11, 2023; Revised: March 24, 2023; Accepted: April 10, 2023; Published: May 15, 2023
Citation: O’Connor, P. J., & Zhang, S. H. (2023). Finite Element Modeling of Acoustic Wave Scattering and Redirection in Active Piezocomposite Acoustic Metamaterials. International Journal of Physics, 14(5), 33–40.
International Journal of Physics | Vol. 14, No. 4, April 2023 | pp. 25–32
DOI: 10.46882/2023/IJP/000156
Research Article
Title: Fluid Inflow Velocity Mapping and Magnetic Reconnection Dynamics in Solar Filament Eruptions
Names of Authors: G. R. Davies¹, O. K. Semenov²
Authors’ Affiliations:
¹ School of Physics and Astronomy, University of St Andrews, St Andrews, UK
² Institute for Solid State Physics, Russian Academy of Sciences, Moscow, Russia
Abstract: High-temperature magnetic reconnection stands as the primary physical process driving explosive energy releases in solar atmospheric plasma, heating material to millions of Kelvin and propelling solar filament eruptions. This paper evaluates fluid velocity mapping and quantifies local magnetic reconnection rates within an eruptive active loop region using high-resolution satellite ultraviolet spectrometers. We tracked the Doppler shifts and intensity profiles of the O IV and Fe XXI spectral emission lines to isolate reconnection pathways under dense plasma constraints. The empirical measurements reveal systematic plasma inflows moving at 16.4 km/s, while directed outflows reach velocities of 295.0 km/s along the magnetic open field corridors. Based on these transport metrics, the local dimensionless reconnection rate was calculated to range between 0.05 and 0.08. These values closely match fast reconnection regimes predicted by the Petschek theoretical framework modified by hall magnetohydrodynamic effects and plasmoid instabilities. Spectroscopic line-broadening analysis indicates localized turbulent temperatures peaking at 10.2 MK within the diffusion region, confirming intense localized viscous dissipation. These diagnostics provide direct observational parameters for refining coronal magnetohydrodynamics.
Keywords: Solar atmosphere; magnetic reconnection; filament eruption; ultraviolet spectroscopy; plasma velocity; magnetohydrodynamics
Manuscript Timeline: Received: January 08, 2023; Revised: February 18, 2023; Accepted: March 05, 2023; Published: April 11, 2023
Citation: Davies, G. R., & Semenov, O. K. (2023). Fluid Inflow Velocity Mapping and Magnetic Reconnection Dynamics in Solar Filament Eruptions. International Journal of Physics, 14(4), 25–32.
International Journal of Physics | Vol. 14, No. 3, March 2023 | pp. 17–24
DOI: 10.46882/2023/IJP/000155
Research Article
Title: Quantum Efficiency Optimization of Antimonene-Based Solar Cells via Linear Bandgap Profiling
Names of Authors: H. K. Tanaka¹, M. G. Richter²
Authors’ Affiliations:
¹ Department of Quantum Engineering, Nagoya University, Nagoya, Japan
² Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
Abstract: Developing group-V elemental two-dimensional monolayers provides a promising architectural path for expanding the conversion metrics of thin-film photovoltaics. This paper presents a detailed numerical model to optimize the internal quantum efficiency of functionalized antimonene solar cells using a graded bandgap structural layout. We systematically evaluated the impacts of carrier recombination lifetimes and interface defect traps on device performance parameters under standard one-sun illumination matrices (AM 1.5G, 100.0 mW/cm²). Our numerical calculations reveal that grading the surface chemical functionalization creates a linear bandgap tilt (varying from 1.20 eV to 1.65 eV) that generates a built-in electric field. This built-in field accelerates charge separation tracks and drops radiative recombination rates. When standard recombination lifetimes of 18.0 ns are introduced, the optimized graded device yields a short-circuit current density of 27.4 mA/cm² and an open-circuit voltage of 0.92 V. This results in a maximum power conversion efficiency of 19.4%, representing a significant improvement over the uniform bandgap control cell. We also analyzed the thermal stability of the device between 280.0 K and 360.0 K, demonstrating that the graded structure reduces thermal efficiency degradation by 25.0%.
Keywords: Antimonene solar cells; graded bandgap; quantum efficiency; charge transport; numerical modeling; photovoltaics
Manuscript Timeline: Received: December 14, 2022; Revised: January 22, 2023; Accepted: February 09, 2023; Published: March 14, 2023
Citation: Tanaka, H. K., & Richter, M. G. (2023). Quantum Efficiency Optimization of Antimonene-Based Solar Cells via Linear Bandgap Profiling. International Journal of Physics, 14(3), 17–24.
International Journal of Physics | Vol. 14, No. 2, February 2023 | pp. 9–16
DOI: 10.46882/2023/IJP/000154
Research Article
Title: Thermal Dispersion Metrics and Phonon Wavepacket Scattering across Silicon-Carbide Heterojunctions
Names of Authors: D. W. Meyer¹, H. L. Mueller²
Authors’ Affiliations:
¹ Institute of Physics, Karlsruher Institut für Technologie, Karlsruhe, Germany
² Institut für Kernphysik, Karlsruher Institut für Technologie, Karlsruhe, Germany
Abstract: Dissipating intense localized heat across structural material boundaries is a significant challenge in modern wide-bandgap high-frequency nanoelectronics and high-power radar modules. This paper utilizes molecular dynamics simulations to quantify thermal dispersion metrics and track acoustic phonon wavepacket scattering at mismatched silicon-carbide (Si-SiC) heterojunctions. We constructed atomistic models using the optimized Tersoff empirical potentials, incorporating varying concentrations of interfacial dislocation defects and interfacial chemical grading configurations. Longitudinal and transverse acoustic phonon wavepackets were generated with narrow frequency spreads centered between 3.0 THz and 12.0 THz. The computational data demonstrate that high-frequency acoustic phonons (f greater than 6.5 THz) undergo strong diffuse scattering at the rough interface, dropping the transmission coefficient from 0.74 down to 0.15. This transport degradation is driven by severe acoustic impedance mismatch and localized interface vibrational modes. The overall interfacial thermal conductance was calculated to decrease by 48.0% when the interface defect density scaled from 1.0% to 5.0% at 300.0 K. These molecular dynamics calculations clarify the atomic-scale paths limiting heat carrier propagation, helping engineers design targeted thermal management interfaces for high-power electronics.
Keywords: Thermal conductance; phonon wavepacket; molecular dynamics; interface defects; silicon-carbide; nanoelectronics
Manuscript Timeline: Received: November 05, 2022; Revised: December 18, 2022; Accepted: January 08, 2023; Published: February 13, 2023
Citation: Meyer, D. W., & Mueller, H. L. (2023). Thermal Dispersion Metrics and Phonon Wavepacket Scattering across Silicon-Carbide Heterojunctions. International Journal of Physics, 14(2), 9–16.
International Journal of Physics | Vol. 14, No. 1, January 2023 | pp. 1–8
DOI: 10.46882/2023/IJP/000153
Research Article
Title: Relativistic Hydrodynamic Simulations of Directed Flow Fluctuations in Asymmetric Silicon-Gold Collisions
Names of Authors: S. C. O’Brien¹, A. M. El-Chemali²
Authors’ Affiliations:
¹ School of Physics, University College Dublin, Dublin, Ireland
² Department of Physics, Faculty of Science, Lebanese University, Beirut, Lebanon
Abstract: High-energy asymmetric nuclear collisions provide a unique experimental platform to probe the initial-state spatial geometry fluctuations required to form a brief droplet of quark-gluon plasma. This study presents a relativistic hydrodynamic simulation framework to model particle production cascades and evaluate directed flow fluctuations in silicon-gold (Si-Au) collisions at a center-of-mass energy of 200.0 GeV per nucleon pair. We utilized a 3+1 dimensional viscous hydrodynamic code coupled with a statistical hadronization module to calculate final-state transverse momentum spectra. The initial energy density distributions were generated via a Monte Carlo Glauber model to track sub-nucleon scale configurations. The numerical simulations show that expanding fireballs develop a substantial radial flow profile, shifting the mean transverse momentum of protons up to 1.15 GeV/c in central events. The calculated directed flow coefficient (v1) displays a strong mass-ordering signature, which matches experimental tracking data from specialized heavy-ion detectors within a tight ±5.5% margin. This agreement implies that small-scale asymmetric nuclear interaction zones can briefly sustain fluid-like collective expansion profiles. These findings clarify the boundary constraints of fluid behavior in subatomic physics.
Keywords: Relativistic hydrodynamics; quark-gluon plasma; directed flow; asymmetric collisions; Glauber model; statistical hadronization
Manuscript Timeline: Received: October 12, 2022; Revised: November 22, 2022; Accepted: December 10, 2022; Published: January 16, 2023
Citation: O’Brien, S. C., & El-Chemali, A. M. (2019). Relativistic Hydrodynamic Simulations of Directed Flow Fluctuations in Asymmetric Silicon-Gold Collisions. International Journal of Physics, 14(1), 1–8.