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Fluctuations and persistence in quantum diffusion on regular lattices

Physical Review E 2025年第2期111卷 024126-024126页

作者： Cheng Ma Omar Malik G. Korniss Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York 12180 USA and Network Science and Technology Center Rensselaer Polytechnic Institute Troy New York 12180 USA

We investigate quantum persistence by analyzing amplitude and phase fluctuations of the wave function governed by the time-dependent free-particle Schrödinger equation. The quantum system is initialized with local random uncorrelated Gaussian amplitude and phase fluctuations. In analogy with classical diffusion, the persistence probability is defined as the probability that the local (amplitude or phase) fluctuations have not changed sign up to time t. Our results show that the persistence probability in quantum diffusion exhibits exponential-like tails. More specifically, in d=1 the persistence probability decays in a stretched exponential fashion, while in d=2 and d=3 as an exponential. We also provide some insights by analyzing the two-point spatial and temporal correlation functions in the limit of small fluctuations. In particular, in the long-time asymptotic limit, the temporal correlation functions for both local amplitude and phase fluctuations become time-homogeneous. Hence, the zero-crossing events correspond to those governed by a stationary Gaussian process, with an autocorrelation-function power-law tail decaying sufficiently fast to imply an exponential-like tail of the persistence probabilities.

关键词： Schrodinger equation

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Revealing atomic strengthening mechanism in CoNiV medium-entropy alloy via machine learning-guided simulations

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Journal of Materials Science and technology 2025年 238卷 66-77页

作者： Li, Wenyue Liu, Xiongjun Liu, Leqing Du, Qing Lin, Deye Chen, Xin He, Dong Wang, Shudao Wu, Yuan Wang, Hui Jiang, Suihe Zhang, Xiaobin Lu, Zhaoping Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China School of Intelligent Manufacturing and Mechanical Engineering Hunan Institute of Technology Hengyang421002 China School of Materials Science and Engineering Ocean University of China Qingdao266100 China CAEP Software Center for High Performance Numerical Simulation Beijing100088 China Institute of Applied Physics and Computational Mathematics Beijing100094 China School of Materials Science and Engineering Dalian University of Technology Dalian116024 China

High/medium entropy alloys (H/MEAs) have shown unique strengthening behavior and mechanical properties because of the presence of massive local chemical orderings. Nevertheless, dynamic interactions between chemical short-range orders (CSROs) and dislocations, and the underlying atomic strengthening mechanism remain elusive. In this work, we first developed a novel machine learning-embedded atom method (ML-EAM) potential of the CoNiV system, trained on a comprehensive first-principles dataset, which enables accurate and efficient modeling of CSRO formation and dislocation dynamics. Then, we investigated the strengthening mechanisms of CSROs in CoNiV MEA through machine learning-augmented molecular dynamics (MD) simulations. Hybrid MD/Monte Carlo simulations reveal that CSRO domains possess an L12 (NiCo)3 V structure, whose size increases with lowering annealing temperatures. These domains significantly enhance strength by impeding dislocation motion through complex energy pathways, increasing depinning forces, and reducing mobility. Moreover, the MD simulations combined with theoretical analysis elucidate the competition between CSRO-assisted strengthening (via antiphase boundary formation) and solid solution weakening (via reduced atomic misfit volume). Phonon-drag effects are also amplified by CSROs, further resisting dislocation glide. Our results demonstrate that L12-CSROs strengthen CoNiV MEA primarily through antiphase boundary and phonon-drag contributions, providing new insights for designing high-performance multi-principal-element alloys via tailoring CSROs. © 2025

关键词： Turing machines

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Two-plasmon-decay instability stimulated by dual laser beams in inertial confinement fusion

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Matter and Radiation at Extremes 2025年第1期10卷 48-56页

作者： C.-W.Lian Y.Ji R.Yan J.Li L.-F.Wang Y.-K.Ding J.Zheng Department of Modern Mechanics University of Science and Technology of ChinaHefeiAnhui 230026China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026China Institute of Applied Physics and Computational Mathematics Beijing 100088China

Two-plasmon-decay instability(TPD)poses a critical target preheating risk in direct-drive inertial confinement *** this paper,TPD collectively driven by dual laser beams consisting of a normal-incidence laser beam(Beam-N)and a large-angle-incidence laser beam(Beam-L)is investigated via particle-in-cell *** is found that significant TPD growth can develop in this regime at previously unexpected low laser intensities if the intensity of Beam-L exceeds the large-angle-incidence *** beams contribute to the growth of TPD in a“seed-amplification”manner in which the absolute instability driven by Beam-L provides the seeds that are convectively amplified by Beam-N,making TPD energetically important and causing significant pump depletion and hot-electron generation.

关键词： laser pump decay

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Quantum synchronization and dissipative quantum sensing

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Physical Review A 2025年第1期111卷 012410-012410页

作者： Gaurav M. Vaidya Simon B. Jäger Athreya Shankar Department of Physics Indian Institute of Technology Madras Chennai 600036 India Physics Department and Research Center OPTIMAS University of Kaiserslautern-Landau D-67663 Kaiserslautern Germany Department of Instrumentation and Applied Physics Indian Institute of Science Bangalore 560012 India Center for Quantum Information Communication and Computing Indian Institute of Technology Madras Chennai 600036 India

We study the phenomenon of quantum synchronization from the viewpoint of quantum metrology. By interpreting quantum self-sustained oscillators as dissipative quantum sensors, we develop a framework to characterize several aspects of quantum synchronization. We show that the quantum Fisher information (QFI) serves as a system-agnostic measure of quantum synchronization that also carries a clear operational meaning, viz., it quantifies the precision with which the amplitude of a weak synchronizing drive can be measured. We extend our analysis to study many-body oscillators subjected to multiple drives. We show how the QFI matrix can be used to determine the optimal drive that maximizes quantum synchronization, and also to quantitatively differentiate the synchronization responses induced by different drives. Our work highlights multiple connections between quantum synchronization and quantum metrology, paving a route toward finding quantum technological applications of quantum synchronization.

关键词： Fisher information matrix

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Digital components and interaction types in counseling interventions for childhood and adolescent obesity: A systematic review

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International Journal of Nursing Sciences 2025年第2期12卷 123-129,I0001页

作者： Mari Virtanen Heli Kerimaa Niko Mannikko Merja Mannisto Karolina Paalimaki-Paakki Minna Lahtinen Miya Jansson Kirsi Kivela Anne Oikarinen Mira Rajala Minna Vanhanen Maria Kaariainen Pirjo Kaakinen Helsinki Metropolia University of Applied Sciences HelsinkiFinland Medical Research Center Oulu Oulu University Hospital and University of OuluOuluFinland Research Unit of Health Sciences and Technology University of OuluFinland The Finnish Centre for Evidence-Based Health Care:A Joanna Briggs Insttute Centre of ExellenceHelsinkiFinland Oulu University of Applied Sciences OuluFinland Research Unit of Medical Imaging Physics and TechnologyUniversity of OuluOuluFinland Oulu University Hospital OuluFinland

Objectives:Childhood and adolescent obesity are an increasing global health *** study aimed to evaluate the effectiveness of digital components and interaction types in counseling interventions for prevention and ***:All studies were searched in online databases and grey literature,including PubMed(Medline),Web of Science,CINAHL,Scopus,IEEE Xplore Digital Library,Journal of Medical Internet Research(JMIR),MedNar,EBSco Open *** search period is from inception to June 2023,and the languages are Finnish,English and *** research quality was evaluated using the web-based data management system Covidence for prevalence *** study protocol was registered with PROSPERO(registration number:CRD42021247595).Results:In this review,4,407 studies were screened,and 22 were *** involved 3,433 participants and 264 child-parent *** digital approaches included multicomponent elements like internet platforms,text messaging,video conferencing,online communities,wearable technology,and mobile apps,allowing one-way,two-way,and face-to-face *** studies showed statistically significant effects of treatment on BMI and waist-to-hip *** interventions reported positive outcomes,with no significant differences between groups,and none showed null effects during ***:Digital multicomponents like mobile apps and wearables can help obese children and adolescents adopt healthier *** these interventions show promise for obesity management,further research is needed to assess their effectiveness,particularly regarding nurses'perspectives.

关键词： Adolescent Children Digital counseling Obese Overweight Systematic review

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Thermodynamic topology of Kiselev-AdS black holes within f(R,T)gravity

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Chinese physics C 2025年第3期49卷 262-276页

作者： Saeed Noori Gashti Mohammad Ali S.Afshar Mohammad Reza Alipoury Yassine Sekhmani Jafar Sadeghi Javlon Rayimbaeva School of Physics Damghan UniversityDamghan ***Iran Department of Physics Faculty of Basic SciencesUniversity of MazandaranBabolsar 47416-95447Iran Center for Theoretical Physics Khazar University41 Mehseti StreetBakuAZ1096Azerbaijan Centre for Research Impact&Outcome Chitkara University Institute of Engineering and TechnologyChitkara UniversityRajpura140401PunjabIndia Canadian Quantum Research Center 204-300232 Ave VernonBC V1T 2L7Canada Institute of Fundamental and Applied Research National Research University TIIAMEKori Niyoziy 39Tashkent 100000Uzbekistan University of Tashkent for Applied Sciences Str.Gavhar 1Tashkent 100149Uzbekistan Urgench State University Kh.Alimdjan str.14Urgench 220100Uzbekistan Tashkent State Technical University Tashkent 100095Uzbekistan

In this paper,we investigate the topological charge and conditions for the existence of the photon sphere in Kiselev-anti-de Sitter(AdS)black holes within f(R,T)***,we establish their topological *** employ two different methods based on Duan's topological current p-mapping theory viz analysis of temperature and the generalized Helmholtz free energy methods to study the topological classes of our black *** this black hole,we discuss the critical and zero points(topological charges and topological numbers)for different *** findings reveal that the Kiselev parameter o and f(R,T)gravity parameter y influence the number of topological charges of black holes,providing novel insights into topological *** observe that for given values of the free parameters,total topological charges(Q_(total)=-1)exist for the T method and total topological numbers(ω=+1)for the generalized Helmholtz free energy *** research findings elucidate that,in contrast to the scenario in whichω=1/3,in other cases,increasing y increases the number of total topological charges for the black ***,for the phantom field(ω=-4/3),we observe that decreasingγincreases the number of topological ***,we study the results for the photon *** studied models reveal that the simultaneous presence ofγandωeffectively expands the permissible range forγ.In other words,the model can exhibit black hole behavior over a larger ***,we observe that with the stepwise reduction ofγ,the region covered by singularity diminishes and becomes more ***,an interesting point about all three ranges is the elimination of the forbidden region in this *** other words,this model and the investigated areas appear to have no region in which both theφand metric functions simultaneously lack ***,we fully check the curvatures singularities and energy conditions for the mentioned

关键词： topological classification Kiselev-Ads black holes f(R,T)gravity energy conditions

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Ramsey’s Conjecture for the Model with Non-liquid Capital 15th

Ramsey’s Conjecture for the Model with Non-liquid Capita...

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15th International Conference on Optimization and Applications, OPTIMA 2024

作者： Parastaev, Grigorii S. Shananin, Alexander A. Lomonosov Moscow State University Moscow Russia Federal Research Center "Computer Science and Control" of the Russian Academy of Sciences Moscow Russia Moscow Institute of Physics and Technology Moscow Oblast Dolgoprudny Russia Peoples’ Friendship University of Russia Moscow Russia Moscow Center of Fundamental and Applied Mathematics Moscow Russia

ISBN: (纸本)9783031791185

Ramsey’s conjecture on social stratification states that economic agents divide into two classes: the class of thrifty agents, who jointly accumulate and share all the economy wealth, and the class of impatient ones forced to live on the wage level only. The present paper outlines the validity of Ramsey’s conjecture on social stratification for the household population in case when capital is non-liquid. The households’ behavior is described by the Ramsey type model of the rational representative consumer. We derive the solution in the synthesis form for the corresponding optimal control problem and use it in the social dynamics model for the household population, where the discount rates, according to Duesenberry’s relative income hypothesis, are set as functions dependent on ratio between capital holdings of specific agent and total capital available of economy. The agents behave in myopic manner, suggesting that the interest rate and the wage rate do not change over time. The connection between the Gini index and the Lyapunov function is also established. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Wages

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Manipulation and control of rotary photon drag in a chiral quantum dot molecular system

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Chinese Journal of physics 2025年 95卷 866-876页

作者： Idrees, Muhammad Badshah, Fazal Ali, Rashid Shehzad, Khurram Khan, Zareen A. Institute of Nonlinear Physics and Department of Physics Zhejiang Normal University Jinhua 321004 China School of Artificial Intelligence Shiyan Key Laboratory of Quantum Information and Precision Optics Hubei University of Automotive Technology Shiyan 442002 China Applied Science Research Center Applied Science Private University Amman Jordan School of mathematical Sciences Zhejiang Normal University jinhua Zhejiang China Institute of Physics Silesian University of Technology Konarskiego 22B Gliwice 44-100 Poland Department of Mathematical Sciences College of Science Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia

This study investigates the manipulation and control of rotary photon drag in a chiral quantum dot molecular system. The system comprises two laterally coupled (In,Ga)As/GaAs quantum dots with distinct band configurations. The results demonstrate the ability to manipulate and control the rotary photon drag of both left-circularly polarized (LCP) and right-circularly polarized (RCP) beams, due to strong chirality induced by electromagnetic fields. Notably, considerable enhancements in rotary photon drag are observed, with values ranging from ±20 rad to ±40 rad for RCP and LCP beams, respectively. Additionally, the study highlights strong manipulation of the group index, divergence angle, and refractive index in these chiral quantum dot molecular systems. The group index is enhanced from ±4×10¹¹ to ±6×10¹¹ for both RCP and LCP beams. Furthermore, a maximum divergence angle of 3.4 rad is observed between the RCP and LCP beams, along with enhanced refractive indices for both polarization states. The enhanced rotary photon drag facilitates precision optical manipulation, chiral sensing, advanced optical communication, and quantum information processing. This work also shows potential for enhancing light-matter interactions in photonic devices, advancing next-generation photonic circuits and sensors. © 2025 The Physical Society of the Republic of China (Taiwan)

关键词： Chiral quantum dots Electromagnetic chirality Group index Optical communication Rotary photon drag

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The effect of external magnetic field on projectile in the stopping power of warm dense deuterium for electrons

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The European Physical Journal Special Topics 2025年 1-16页

作者： Chen, Yuzhu Mo, Chongjie Xue, Quanxi Fu, Zhenguo Liu, Hao Department of Applied Physics School of Physics and Electronics Hunan University Changsha China Beijing Computational Science Research Center Beijing China State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear Technology Xi’an China Institute of Applied Physics and Computational Mathematics Beijing China

The stopping power of warm dense plasmas for electrons is a critical aspect in the study of hot electron transport. An externally applied strong magnetic field can significantly influence electron transport behavior due to various factors. However, the impact of external magnetic fields on the motion of incident particles is often overlooked. Through molecular dynamics simulations using the electron force field (eFF) method, this study investigates the stopping process of individual hot electrons in warm dense deuterium plasma under an applied longitudinal magnetic field. Results show that, at typical laboratory magnetic field intensities, the magnetic field significantly alters electron trajectories without notable effects on average stopping power, trajectory length, or scattering angle. Even with increased magnetic field intensity beyond 500 kT, it doesn’t affect the total kinetic energy loss of incident electrons but reduces stopping power by compressing the scattering angle distribution width. Due to the increase in the scattering angle distribution width with intensified fluctuations in high-temperature targets, the impact of the additional magnetic field on stopping power becomes more pronounced with an increase in target temperature.

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Study of the atmospheric neutron radiation effects using compact laser-driven spallation neutron source

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Physical Review Research 2025年第1期7卷 013071-013071页

作者： Z. B. Wu Y. L. Yao X. F. Shen K. Li A. D. Liu X. T. He B. Qiao Center for Applied Physics and Technology HEDPS and SKLNPT School of Physics Peking University Beijing 100871 China Research Center of Laser Fusion China Academy of Engineering Physics (CAEP) Mianyang 621900 China Institute of System Engineering China Academy of Engineering Physics (CAEP) Mianyang 621900 China Institute of Applied Physics and Computational Mathematics Beijing 100094 China Frontiers Science Center for Nano-optoelectronic Peking University Beijing 100094 China

We propose a laboratory accelerated test method for study of the atmospheric neutron radiation effects by using a compact laser-driven spallation neutron source (LDSNS). The LDSNS is obtained by injecting a GeV quasimonoenergetic proton beam accelerated by light-sail (LS) radiation pressure of intense lasers into a lead target. According to the LS scaling law, proton energy spectra can be regulated by adjusting the laser and foil target parameters, so that the neutron spectra at various atmospheric altitudes are well reproduced. Integrated PIC and MC simulations have verified the scheme (for that at altitude 12 km, laser intensity of 1022W/cm2 is required) and shown that the neutron fluence per laser shot is as high as 1.73×108n/cm2, equivalent to 3.7 year flux accumulation in atmosphere. Using the G4SEE toolkit, we estimate that the HM628128 SRAM may undergo an average of ten single event upsets per shot for the proposed laboratory test.

关键词： Spalling

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