Article
Physics, Multidisciplinary
Attilio L. Stella, Aleksei Chechkin, Gianluca Teza
Summary: This passage discusses the occurrence of anomalous diffusion phenomena across different length scales, and introduces a specific form of decay related to the probability density function. It also explains the implications of this decay on the normalized cumulant generator, and provides examples related to second-order phase transition singularities in continuous time random walks. In the case of bias, scaling is limited to displacements in the drift direction, and there is no equilibrium analogue for the singularities.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Yueshui Zhang, Anton Hulsch, Hua-Chen Zhang, Wei Tang, Lei Wang, Hong-Hao Tu
Summary: We demonstrate that the Klein bottle entropy in conformal field theories perturbed by relevant operators is a universal function of the dimensionless coupling constant. This universal scaling of the Klein bottle entropy near criticality can be used to efficiently determine the scaling dimension of lattice operators through data collapse. By employing numerical simulations with the continuous matrix product operator approach, we validate the universal scaling of the Klein bottle entropy for Ising and Z3 parafermion conformal field theories with various perturbations.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Fluids & Plasmas
Corentin C. L. Laudicina, Chengjie Luo, Kunimasa Miyazaki, Liesbeth M. C. Janssen
Summary: Building on the inhomogeneous mode-coupling theory, the generalized mode-coupling theory of supercooled liquids is extended to inhomogeneous environments. This allows for a systematic way of deriving high-point dynamical susceptibilities from variations in dynamic structure factors, providing insights into collective relaxation mechanisms in supercooled liquids.
Article
Physics, Fluids & Plasmas
Yue Liu, Dahai He
Summary: Based on the geometrization of dynamics and self-consistent phonon theory, an analytical approach is developed to derive the Lyapunov time for general nonlinear lattices. The universal scaling behavior of the Lyapunov time with the nonintegrability strength is observed for the quasi-integrable regime, with the scaling exponent being the same as the thermalization time. This proportional relationship indicates how the thermalization process is related to the intrinsic chaotic property.
Article
Materials Science, Multidisciplinary
Shuai Yin, Shao-Kai Jian
Summary: Dynamical phase transition in non-equilibrium quantum many-body systems can be transformed into a dynamical critical point by fermion fluctuations, known as a fermion-induced dynamical critical point (FIDCP). This FIDCP exhibits short-time scaling behavior controlled by the dynamical chiral fixed point, even though the system undergoes a first-order transition after thermalization. The study also identifies a dynamical tricritical point between the first-order DPT and the FIDCP, which can be controlled by tuning a dynamical dangerously irrelevant scaling variable.
Article
Physics, Multidisciplinary
Soheli Mukherjee, Sumedha
Summary: This passage discusses the role of critical end points and tricritical points in the phase diagram of many systems. It also investigates the behavior of the first order phase boundary and co-existence diameter around these multicritical points.
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
(2023)
Article
Physics, Multidisciplinary
Yusuke Terasawa, Yukiyasu Ozeki
Summary: The ±J Ising model in three dimensions has been studied using dynamical scaling analysis, focusing on the spin-glass (SG) transition. A precise estimation of dynamical exponent z is obtained by introducing an extrapolation scheme for the logarithmic derivative of the dynamical Binder parameter. The phase diagram in the temperature-concentration space is obtained, along with the p-dependence of critical exponents γ, ν, and z. Strong numerical evidence of universality is found for the static exponents of the SG transition. A remarkable crossover behavior is observed near the multicritical point of the paramagnetic-ferromagnetic-SG phases.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Mathematics, Applied
Jinliang Wang, Meiyu Cao, Toshikazu Kuniya
Summary: In this paper, the authors revisit a nonlocal and time-delayed reaction-diffusion model, which arises from the fixed incubation period, and consider a continuous infection age variable to describe the spread of malaria in a bounded domain. By performing elementary analysis, they prove the global existence of solutions and derive the explicit formula for the basic reproduction number under constant parameter values. They also establish threshold dynamics of disease-free and positive equilibria by analyzing characteristic equations and designing suitable Lyapunov functions. Numerical simulations in 1-dimensional and 2-dimensional domains validate their theoretical results.
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK
(2023)
Article
Environmental Sciences
Joshua Prettyman, Tobia Kuna, Valerie Livina
Summary: This paper justifies the use of the power spectrum (PS) scaling exponent as a tipping point indicator analytically. Even when the PS does not exhibit power-law scaling or changes over time, this method remains effective. Furthermore, this method is robust against trends and oscillations in the time series, making it suitable for studying the resilience of systems with periodic oscillations.
ENVIRONMENTAL RESEARCH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Oliver Hart, Rahul Nandkishore
Summary: We discuss the quantum dynamics in the transverse field Ising model in two dimensions and show that the Hilbert space shatters into dynamically disconnected subsectors up to a quantified prethermal timescale. This shattering arises from the interplay of a U(1) conservation law and a one-form Z2 constraint. The number of disconnected subsectors is exponential in system volume, and a subspace with exponential growth within the system volume exhibits exactly localized dynamics.
Article
Mathematics, Applied
Hui Li, Nader Masmoudi, Weiren Zhao
Summary: In this paper, using a new dynamical approach, we investigate the Couette flow of Navier-Stokes equations under the condition of small viscosity and obtain the optimal instability threshold. We also provide a new tool to prove the existence of growing modes for the corresponding Rayleigh operator.
COMMUNICATIONS ON PURE AND APPLIED MATHEMATICS
(2023)
Article
Chemistry, Physical
John P. Stoppleman, Jesse G. McDaniel, Marcus T. Cicerone
Summary: This study shows the role of structural excitations in liquid relaxation and their relationship with density scaling. The study also discovers the equivalence between Gru''neisen parameter and density scaling parameter in interbasin crossing modes.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Fluids & Plasmas
Naftali R. Smith
Summary: In this study, we investigate the distribution of A = LT xn(t)dt, where x(t) is an Ornstein-Uhlenbeck process. We find that for n > 2, the long-time scaling form of the distribution exhibits an anomalous behavior. By calculating the exact rate function, we identify a first-order dynamical phase transition that separates the Gaussian distribution of typical fluctuations from the condensed phase describing the tails of the distribution.
Article
Chemistry, Physical
Mingyu Xie, Faxin Li
Summary: The modified piezoelectric ultrasonic composite oscillator technique was used to measure the temperature dependence of Young's modulus, shear modulus, and internal frictions of polycrystalline aluminum and magnesium. The grain boundary internal frictions and moduli relaxations were observed near the melting point in both vibration modes. The activation energy of grain boundary relaxation was similar in both vibration modes, and the peak values of grain boundary internal frictions were significantly dependent on the vibration mode.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Chen Liao, Luping Tang, Yan Li, Shaoling Sun, Liye Wang, Jie Xu, Yunzhe Jia, Zixuan Gu
Summary: Temperature-insensitive near-infrared optical gain is achieved using low-toxicity Ag2Se quantum dots, allowing efficient amplified spontaneous emission even at high temperatures.
Article
Chemistry, Physical
Yuta Toga, Seiji Miyashita, Akimasa Sakuma, Takashi Miyake
NPJ COMPUTATIONAL MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Masamichi Nishino, Ismail Enes Uysal, Taichi Hinokihara, Seiji Miyashita
Summary: The study focuses on investigating the static and dynamic properties of the Nd permanent magnet, Nd2Fe14B, and presents the temperature dependence of magnetizations, domain wall profiles, and ferromagnetic resonance frequency. Additionally, the coercive force of a single grain is estimated using a statistical method, showing the surface anisotropy effect of Nd atoms on coercive force and magnetic fields in a hard-soft-hard magnet model.
Review
Materials Science, Multidisciplinary
Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Ismail Enes Uysal, Takashi Miyake, Hisazumi Akai, Satoshi Hirosawa, Akimasa Sakuma
Summary: This article focuses on the thermal properties of Nd2Fe14B magnet and methods of studying them, covering various thermodynamic properties and coercivity, as well as the effects of dipole-dipole interaction in large grains. The study also includes the analysis of surface nucleation and the distribution of properties of grains from the viewpoint of first-order reversal curve.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
(2021)
Article
Physics, Applied
Masamichi Nishino, Yogendra Singh, Kamel Boukheddaden, Seiji Miyashita
Summary: The paper introduces elastic interaction models for spin-crossover (SC) compounds and multistep transitions, analyzing phase diagrams including metastable phases for several SC systems. It also investigates SC transitions in core-shell SC nanocomposites composed of two different compounds.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Joachim Falck Brodin, Per Arne Rikvold, Marcel Moura, Renaud Toussaint, Knut Jorgen Maloy
Summary: In this study, the transition from steady high viscosity flow to unstable finger-like flow under gravitational effects in a cubic container filled with synthetic porous medium is investigated. A newly developed 3D scanner is used to observe and analyze the flow behavior.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Condensed Matter
Hans De Raedt, Seiji Miyashita, Kristel Michielsen, Herve Vezin, Sylvain Bertaina, Irinel Chiorescu
Summary: Recent electron spin resonance experiments have shown that sustained Rabi oscillations can be achieved by driving a magnetic moment with microwave fields. This paper investigates the interactions between microwave drives and three relaxation mechanisms using numerical and analytical techniques. In addition, two microscopic models are proposed to describe the effects of microwave fields and interactions on Rabi oscillations.
EUROPEAN PHYSICAL JOURNAL B
(2022)
Editorial Material
Physics, Applied
Kamel Boukheddaden, Seiji Miyashita, Smail Triki
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Giovanni Franco-Rivera, Josiah Cochran, Seiji Miyashita, Sylvain Bertaina, Irinel Chiorescu
Summary: We demonstrate a strong coupling between a Gd3+ spin ensemble in a scheelite single crystal and a superconducting cavity, resulting in a large separation of spin-photon states. The interaction is well described by the Dicke model and crystal-field Hamiltonian. The presence of photons in the cavity induces changes in the crystal-field parameters and perturbs the crystal ground state. Numerical calculations estimate the cavity sensing volume and the average spin-photon coupling strength to be approximately 620 Hz.
PHYSICAL REVIEW APPLIED
(2023)
Article
Water Resources
Paula Reis, Marcel Moura, Gaute Linga, Per Arne Rikvold, Renaud Toussaint, Eirik Grude Flekkoy, Knut Jorgen Maloy
Summary: Liquid-filled corners and capillary bridges can establish networks connecting seemingly isolated clusters during drainage in porous media. This drainage mechanism can significantly affect fluid configurations and residual saturations.
ADVANCES IN WATER RESOURCES
(2023)
Article
Materials Science, Multidisciplinary
Masamichi Nishino, Hiroshi Hayasaka, Seiji Miyashita
Summary: This study investigates the enhancement mechanism of the radial shell in dysprosium magnets, and identifies the features and mechanisms of coercivity enhancement using an atomistic model. The results show that a change from surface to bulk nucleation significantly enhances coercivity, especially at high temperatures.
Article
Materials Science, Multidisciplinary
Hiroshi Hayasaka, Masamichi Nishino, Seiji Miyashita
Summary: The angular dependence of coercivity in permanent magnets is explored in this study. The investigation includes the effects of temperature and thermal fluctuations on magnetization reversal. The study reveals differences in magnetization reversal mechanisms at zero and finite temperatures, as well as variations in the angular dependences of nucleation and pinning fields. The thermal fluctuation reduces threshold fields, alters angular dependences, and narrows the gap between nucleation and pinning fields. Additionally, the alignment distribution of grains impacts the angular dependences of threshold fields.
Article
Physics, Fluids & Plasmas
Aleks J. Gurfinkel, Per Arne Rikvold
Summary: Centrality, a fundamental concept in modern network theory, quantifies the importance of individual nodes through various measures. This paper introduces a classification system for parametrized centralities and identifies a new type of centrality called ground-current centrality. The ground-current centrality differs significantly from other centralities and demonstrates consistent performance in preserving rank order and centrality value distribution across different network architectures.
Article
Materials Science, Multidisciplinary
Taichi Hinokihara, Seiji Miyashita
Summary: This study investigates various magnetic configurations caused by dipole-dipole interaction in thin-film magnets with perpendicular anisotropy under open boundary conditions. The research identifies five typical configurations and observes a unique magnetic-domain pattern resulting from the open boundary conditions.
Article
Materials Science, Multidisciplinary
Masamichi Nishino, Ismail Enes Uysal, Seiji Miyashita
Summary: The Nd permanent magnet is essential in energy conversion devices, and controlling coercivity relies on the surface properties of magnetic grains. Research shows that modifications of only the first surface layer have little impact on coercivity at finite temperatures, while alterations in multiple layers have significant effects. The study provides insights into the dependencies of coercivity on temperature, surface type, modified layer depth, and domain growth in magnetization reversal.
Article
Materials Science, Multidisciplinary
Hiroaki Onishi, Seiji Miyashita
Summary: Finite-temperature properties of a Hubbard model including particle bath sites were studied using numerical methods. The specific heat showed peaks corresponding to different energy scales of ordering processes, with magnetic correlations developing at very low temperatures. Depending on parameters, the system exhibited either an itinerant ferromagnetic or antiferromagnetic state, with competition between magnetic states leading to a peculiar ordering process of local spin correlations.
