Article
Mathematics, Applied
Qiangchang Ju, Tao Luo, Xin Xu
Summary: This article rigorously demonstrates the quasi-neutral limit of the Navier-Stokes-Poisson system modeling a viscous plasma with vanishing viscosity coefficients in the half-space R3 + under a Navier-slip boundary condition for velocity and the Dirichlet boundary condition for electric potential. This is achieved by addressing the interaction between the strong boundary layer of density and electric potential and the weak boundary layer of the velocity field, as well as establishing the nonlinear stability of the approximation solutions.
SCIENCE CHINA-MATHEMATICS
(2023)
Article
Physics, Fluids & Plasmas
Peter Magyar, Gabor J. Kalman, Peter Hartmann, Zoltan Donko
Summary: This study investigates the response functions of the Coulomb one-component plasma at various coupling values using data from equilibrium molecular dynamics computer simulations. The focus is on the negative compressibility range, where the response exhibits acausal behavior. By examining the dielectric response function instead of the peaks of the dynamical structure function, a more reliable representation for the dispersion is obtained.
Article
Multidisciplinary Sciences
Raphaela Vogel, Anna Lea Albright, Jessica Vial, Geet George, Bjorn Stevens, Sandrine Bony
Summary: Shallow cumulus clouds in the trade-wind regions help cool the planet by reflecting solar radiation. The response of these clouds to climate change is a key uncertainty in climate projections. New observations from the EUREC(4)A field campaign refute the hypothesis that increased lower-tropospheric mixing leads to decreased cloudiness. Our findings suggest a weak trade cumulus feedback and refute the evidence for high climate sensitivity.
Article
Physics, Multidisciplinary
Yang Chen, Weijin Chen, Xianghong Kong, Dong Wu, Jiaru Chu, Cheng-Wei Qiu
Summary: This study demonstrates strong coupling between quasibound states in the continuum of a high-Q metasurface, assisted with externally introduced enantiomers of weak chirality. A chirality-involved Hamiltonian is established to quantitatively describe the correlation between the coupling strength and the chirality of such systems, providing an insightful recipe for enhancing the coupling of resonant states further in the presence of quite weak chirality. The findings present a distinct strategy for manipulating optical coupling between resonances, revealing opportunities in chiral sensing, topological photonics, and quantum optics.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
J. D. Cresser, J. Anders
Summary: This study investigates the mean force Gibbs state that arises from interactions between a system and environment, revealing its properties under different coupling regimes. Several examples, including single qubits and coupled qubits, are discussed to shed light on the presence of coherences in the strong coupling regime.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Applied
Mehmet Gunay, Ahmet Bicer, Nurettin Korozlu, Ahmet Cicek
Summary: This study demonstrates the tunable interaction strength between a side-coupled ring resonator and an acoustic waveguide structure. Fano resonances in the weak coupling regime are observed due to the interference between a discrete state of the ring resonator and a continuum state of the waveguide. As the distance between the two structures decreases, a transition from weak to strong coupling regime is achieved, resulting in the splitting of the transmission spectrum and the presence of Rabi oscillations in the temporal behavior at smaller values. The finite-element method simulations support these findings, which can be explained by a simple theoretical model describing the dynamics of the hybrid modes. These results have important implications for device applications in acoustic sensors, switches, and surface acoustic wave integrated circuits.
APPLIED PHYSICS LETTERS
(2023)
Article
Quantum Science & Technology
Timofey T. Sergeevl, Ivan V. Vovcenko, Alexander A. Zyablovsky, Evgeny S. Andrianov
Summary: This paper demonstrates that the interaction between the coupled system and the environment induces additional coupling between the subsystems, which helps to maintain the system in a strong coupling regime. It is also found that, in some cases, the strong coupling regime can occur even when the relaxation rate is significantly higher than the coupling strength between the subsystems. Controlling the gradient of the reservoir density of states can serve as an additional tool to control the properties of the coupled systems.
Article
Chemistry, Physical
Toshikaze Chiba, Yuka Sakuma, Masayuki Imai, Primoz Ziherl
Summary: We studied the morphological changes of adhering vesicle triplets under different adhesion regimes and analyzed their dependence on volume-to-area ratio. In the strong adhesion regime, the triplet morphology varied based on the arrangement of vesicles. Decreasing the volume-to-area ratio transformed a triangular triplet into a compact spherical shape with a sigmoidal contact zone, while a linear vesicle triplet deformed into a compact spherical shape with biconvex interfaces. The morphologies of triplets with flat contact zones were explained by the two-tension model, but when the interface deformed, the cavity model was more appropriate. In the weak adhesion regime, both triangular and linear vesicle triplets transformed into prolate-based triplets by reducing the volume-to-area ratio.
Article
Physics, Fluids & Plasmas
Dong Huang, Shaoyu Lu, Xia-qing Shi, J. Goree, Yan Feng
Summary: The study investigates the convergence of the steady-state fluctuation theorem in a shear-flow experiment in a dusty plasma with a viscoelastic property characterized by the Maxwell relaxation time Tau M. It is found that the SSFT convergence time decreases with increasing system size until it reaches a minimum value of Tau M, indicating that convergence is limited by the energy-storage property of the viscoelastic medium.
Article
Chemistry, Multidisciplinary
Radhika Chauhan, B. D. Indu
Summary: The microscopic theory based on Hamiltonian successfully explains the behavior of various superconducting properties in high-Tc superconductors, with a focus on electron-phonon coupling and its effects on different coupling regimes. An agreement between evaluated and experimental results has been observed, with strong coupling being responsible for high transition temperature in HTSCs.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Physics, Particles & Fields
Noam Levi, Toby Opferkuch, Diego Redigolo
Summary: Supercooled first order phase transitions are typical of theories with predominantly spontaneously broken conformal symmetry, where the fate of the flat scalar direction is highly sensitive to the size and scaling dimension of explicit breaking deformations. We identify the supercooling window and its boundaries in weakly coupled theories, providing a fully analytical understanding. This allows us to identify deformations that enlarge the supercooling window and characterize their dynamics analytically. Additionally, we discuss strongly coupled conformal field theories with an holographic dual, where calculability issues challenge the complete characterization of the supercooling window.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Multidisciplinary
E. Parasuraman
Summary: The study investigates weak and strong energy localization in a single-wall carbon nanotube with higher-order inter-atomic interaction potential, analyzing its dynamics and wave evolution through simulations and equations, and examining the impact of inter-atomic interaction potential on the formation of discrete breather modes.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Astronomy & Astrophysics
Yan-Qing Zhao, Defu Hou
Summary: This paper investigates the dissociation effect of bottomonium using a holographic model that considers higher-order curvature corrections. The results show that the effective potential is not suitable for estimating the dissociation strength of bottomonium under finite wave numbers and higher-order curvature corrections. By calculating the quasinormal spectra and the differential configuration entropy, it is found that the dissociation effect becomes stronger with stronger coupling.
Article
Chemistry, Physical
Blake S. Simpkins, Adam D. Dunkelberger, Jeffrey C. Owrutsky
Summary: Vibrational strong coupling presents new opportunities in chemical processes, but also faces obstacles such as lack of mechanism understanding, unconventional spectroscopic interpretations, and shortage of evidence. Overcoming these challenges is crucial for establishing the field of quantum optical chemistry.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Wen Yi Lv, Chun Hong Li, Fei Fan Yang, Yuan Fang Li, Shu Jun Zhen, Cheng Zhi Huang
Summary: A weak-inputs-strong-outputs strategy was proposed to guide the construction of sensitive logic nanodevices by coupling an input-induced reversible DNA computing platform with a signal amplifier based on hybridization chain reaction. The newly formed logic nanodevices have good sensitivity to weak input signals and can perform various logic operations in a dilute solution medium.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Physics, Fluids & Plasmas
Vikram S. Dharodi, Bhavesh Patel, Amita Das
Summary: Kelvin-Helmholtz instability is numerically explored in a two-dimensional strongly coupled dusty plasma medium with rotational shear flows. The interplay between KH vortices and shear waves in the strongly coupled medium enhances mixing and transport behavior compared to standard inviscid hydrodynamic fluids. Lagrangian tracer particles are used to estimate diffusion in the medium.
JOURNAL OF PLASMA PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Vijay Shankar, N. Bisai, Shrish Raj, A. Sen
Summary: This study theoretically investigates the effect of edge biasing on the dynamics of interchange turbulence in the edge and scrape-off layer regions. The results show that positive biasing leads to a larger increment in plasma density and temperature compared to negative biasing. It is also observed that the cross-correlation between density and poloidal electric field decreases for positive biasing, while it remains similar to no biasing for negative biasing. The study further analyzes the fluctuations in plasma density and poloidal electric field, revealing an increase in density fluctuations for positive biasing and a decrease for negative biasing.
Article
Physics, Fluids & Plasmas
Bhumika Thakur, Abhijit Sen, Neeraj Chaubey
Summary: A plasma glow discharge tube is a versatile device widely used in scientific and industrial applications, as well as in basic plasma studies. Anode glow oscillations, a well-known phenomena in these devices, exhibit rich dynamical behavior depending on various parameters. Researchers have used the sparse identification of nonlinear dynamics (SINDy) method to obtain a quantitative model equation directly from experimental data, which captures the main features of the data and deviates significantly from the existing Van der Pol model. This hybrid model could guide future explorations of the nonlinear dynamics of this system.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Tajinder Singh, Javier H. Nicolau, Zhihong Lin, Sarveshwar Sharma, Abhijit Sen, Animesh Kuley
Summary: In this study, global gyrokinetic simulations are conducted to investigate the ion temperature gradient (ITG) and trapped electron mode (TEM) in the LHD stellarator. The simulations reveal that kinetic electron effects significantly enhance the growth rate and turbulent transport levels. Zonal flow is found to dominate the saturation mechanism in ITG turbulence, while the inverse cascade of toroidal harmonics plays a crucial role in the saturation of TEM turbulence. Furthermore, the simulations indicate that ITG turbulence is more effective in driving heat conductivity, while TEM turbulence is more efficient for particle diffusivity.
Article
Physics, Multidisciplinary
Swarnima Singh, P. Bandyopadhyay, Krishan Kumar, A. Sen
Summary: The study presents the first observations of a square lattice formation in a monodisperse complex plasma system, and successfully achieves configurational transition by carefully controlling the system's specific parameters. Some theoretical insights into the transition process are provided through molecular dynamics simulations.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Laxman Prasad Goswami, Trishul Dhalia, Rohit Juneja, Srimanta Maity, Sathi Das, Amita Das
Summary: This study demonstrates the parametric process of Brillouin scattering in magnetized plasma targets using one-dimensional Particle-in-cell simulations. The excitation of this scattering process and its nonlinear regime are investigated in the presence of an external magnetic field.
Article
Physics, Fluids & Plasmas
Abhijit Sen, Rupak Mukherjee, Sharad K. Yadav, Chris Crabtree, Gurudas Ganguli
Summary: This study investigates stationary nonlinear electromagnetic solitons in an inertial magnetohydrodynamic model. These structures form when a charged source moves in a magnetized plasma and have the same velocity as the source, appearing as pinned structures around it. The excitation of such solitons in the Low Earth Orbit region by charged orbital debris objects is examined. These electromagnetic solitons, typically a few ion skin depths in size, can be detected using various ground- or orbit-based radio sounding techniques, providing an additional means of tracking small sized orbital debris objects that are difficult to spot optically.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Fluids & Plasmas
Krishan Kumar, P. Bandyopadhyay, Swarnima Singh, A. Sen
Summary: We report experimental observations of trapping waves in a flowing dusty plasma. By installing copper wires on the cathode, the flow in the dust fluid and wave propagation can be generated and confined. When the separation between the wires is below a critical value, the wave gets trapped between the wires for a few seconds, with constant amplitude of wave crests and distance between them. Numerical solutions and molecular dynamic simulations qualitatively reproduce the experimental findings.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Ayushi Vashistha, Devshree Mandal, Srimanta Maity, Amita Das
Summary: By manipulating the density profile of the plasma target, the absorption of the incident laser pulse can be achieved at a chosen localized point, resulting in ion heating. Controlling the plasma density profile allows the incident laser to propagate inside the plasma target when its frequency is below the LH resonance frequency. As it approaches the resonance point with a negative density gradient, its group velocity approaches zero and the electromagnetic energy converts into electrostatic and kinetic energy of ions. Therefore, tailoring the plasma density profile is important for applications where localized energy deposition/heating of plasma is desired.
PLASMA PHYSICS AND CONTROLLED FUSION
(2023)
Article
Mathematics, Applied
Neeraj Chaubey, Pankaj Kumar Shaw, S. Mukherjee, A. Sen
Summary: We have observed for the first time phase switching in a system of three coupled plasma sources. Two plasma sources are inductively coupled, while the third one is directly coupled to one of them. The coupled system first reaches a frequency pulling synchronized state and then undergoes a transition to a frequency entrainment state with an increase in the frequency of the directly coupled source. A sudden jump from a lower to a higher frequency entrainment state and a phase switching between the oscillations of the directly coupled sources are observed, while the phase difference between the inductively coupled sources remains constant. Various diagnostic tools, such as Fourier spectra, frequency bifurcation plots, Lissajous plots, and Hilbert transforms, are used to establish these experimental findings. A qualitative model based on three coupled van der Pol equations, with two environmentally coupled and one directly coupled, is proposed.
Article
Physics, Fluids & Plasmas
Tajinder Singh, Deepti Sharma, Tanmay Macwan, Sarveshwar Sharma, Joydeep Ghosh, Abhijit Sen, Zhihong Lin, Animesh Kuley
Summary: Global gyrokinetic simulations are conducted to study the electrostatic microturbulence driven by pressure gradients of thermal ions and electrons in the ADITYA-U tokamak geometry. Collisional effects are taken into account. The dominant instability is identified as trapped electron mode (TEM) based on its linear eigenmode structure and propagation in the electron diamagnetic direction. Turbulence and transport are suppressed to some extent by collisional effects. Zonal flow does not play a critical role in TEM saturation, with the inverse cascade dominating. The frequency spectrum of electrostatic fluctuations is in broad agreement with experimentally recorded spectrum in ADITYA-U, ranging from approximately 0 to 50 kHz.
Article
Physics, Fluids & Plasmas
Swarnima Singh, P. Bandyopadhyay, Krishan Kumar, M. G. Hariprasad, S. Arumugam, A. Sen
Summary: In this paper, the transition of a 2D dust crystal to a non-equilibrium solid-liquid phase coexistence state is experimentally observed. The experiments are conducted in an L-shaped dusty plasma experimental device in a DC glow discharge argon plasma environment. Initially, a monolayer crystalline structure is formed and later transformed to a two-phase coexistence state. Self-excited horizontal oscillations are found in the center of the monolayer before the appearance of the coexistence state. Various structural, thermodynamic, and dynamical quantities are used to characterize the phase state, and the surface tension at the solid-liquid circular interface is determined. A detailed parametric study is conducted to determine the existence region of this state, and it is found that melting at the core is caused by the onset of a localized Schweigert instability in the presence of stray particles beneath the top layer in that region.
PHYSICS OF PLASMAS
(2023)
Article
Multidisciplinary Sciences
Krishan Kumar, P. Bandyopadhyay, Swarnima Singh, Vikram S. S. Dharodi, A. Sen
Summary: We present the first experimental observations of a single-mode Kelvin-Helmholtz instability in a flowing dusty plasma with compressible flow. The experiments were conducted in an inverted D-shaped dusty plasma experimental device in a DC glow discharge Argon plasma environment. By introducing directional motion to a specific dust layer, the shear between the moving and stationary layers excites the Kelvin-Helmholtz instability, resulting in a vortex structure at the interface. The growth rate of the instability decreases with increasing gas flow velocity and compressibility of the dust flow, and the shear velocity is further increased by flowing the stationary layer in the opposite direction. Molecular dynamics simulations support these experimental findings.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Fluids & Plasmas
Ajaz Mir, Sanat Tiwari, Abhijit Sen, Chris Crabtree, Gurudas Ganguli, John Goree
Summary: In this article, the synchronization of dust acoustic waves with an external periodic source in a dusty plasma medium is studied. The system exhibits harmonic (1:1) and superharmonic (1:2) synchronized states for a spatiotemporally varying source term. The existence domains of these states are characterized using Arnold tongue diagrams in the parametric space of the forcing amplitude and forcing frequency, and their resemblance to previous experimental results is discussed.
Article
Physics, Fluids & Plasmas
Srimanta Maity, Laxman Prasad Goswami, Ayushi Vashistha, Devshree Mandal, Amita Das
