Physical review. E最新文献_第2页

Complete positivity and thermal relaxation in quadratic quantum master equations.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054116

F Nicacio, T Koide

引用次数: 0

Diffusion of fast and slow excitons with an exchange in quasi-two-dimensional systems.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054139

Oluwafemi P Adejumobi, Vladimir N Mantsevich, Vladimir V Palyulin

{"title":"Diffusion of fast and slow excitons with an exchange in quasi-two-dimensional systems.","authors":"Oluwafemi P Adejumobi, Vladimir N Mantsevich, Vladimir V Palyulin","doi":"10.1103/PhysRevE.110.054139","DOIUrl":"https://doi.org/10.1103/PhysRevE.110.054139","url":null,"abstract":"By means of analytical calculations and numerical simulations, we study the diffusion properties in quasi-two-dimensional structures with two exciton subsystems with an exchange between them. The experimental realization is possible in systems where fast and slow exciton subsystems appear. For substantially different diffusion coefficients of the species, the negative diffusion can be observed if one measures the transport properties of only a single subsystem, just as was obtained in experimental studies for quasi-two-dimensional semiconductor systems. The initial transition from a fast subsystem to a slow one results in a delayed release of fast excitons in the area close to the original excitation spot. Hence, the signal from the fast excitons alone includes the delayed replenishment from the transition of slow quasiparticles. This is seen as the narrowing of the exciton density profile or decrease of mean-squared displacement which is then interpreted as a negative diffusion. We show that the analytical theory matches the available experimental data for negative diffusion quite well. The average diffusion coefficients for the combined population are analytically expressed through the diffusion coefficients of fast and slow excitons. Simple analytical expressions for effective diffusion coefficients obtained in limiting cases are of interest both for theoretical and experimental analysis of not only the exciton transport, but also for a variety of systems, where fast and slow moving subsystems are present.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"110 5-1","pages":"054139"},"PeriodicalIF":2.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metaplasticity and memory in multilevel recurrent feed-forward networks.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054304

Gianmarco Zanardi, Paolo Bettotti, Jules Morand, Lorenzo Pavesi, Luca Tubiana

{"title":"Metaplasticity and memory in multilevel recurrent feed-forward networks.","authors":"Gianmarco Zanardi, Paolo Bettotti, Jules Morand, Lorenzo Pavesi, Luca Tubiana","doi":"10.1103/PhysRevE.110.054304","DOIUrl":"https://doi.org/10.1103/PhysRevE.110.054304","url":null,"abstract":"Network systems can exhibit memory effects in which the interactions between different pairs of nodes adapt in time, leading to the emergence of preferred connections, patterns, and subnetworks. To a first approximation, this memory can be modeled through a \"plastic\" Hebbian or homophily mechanism, in which edges get reinforced proportionally to the amount of information flowing through them. However, recent studies on glia-neuron networks have highlighted how memory can evolve due to more complex dynamics, including multilevel network structures and \"metaplastic\" effects that modulate reinforcement. Inspired by those systems, here we develop a simple and general model for the dynamics of an adaptive network with an additional metaplastic mechanism that varies the rate of Hebbian strengthening of its edge connections. The metaplastic term acts on a second network level in which edges are grouped together, simulating local, longer timescale effects. Specifically, we consider a biased random walk on a cyclic feed-forward network. The random walk chooses its steps according to the weights of the network edges. The weights evolve through a Hebbian mechanism modulated by a metaplastic reinforcement, biasing the walker to prefer edges that have been already explored. We study the dynamical emergence (memorization) of preferred paths and their retrieval and identify three regimes: one dominated by the Hebbian term, one in which the metareinforcement drives memory formation, and a balanced one. We show that, in the latter two regimes, metareinforcement allows the retrieval of a previously stored path even after the weights have been reset to zero to erase Hebbian memory.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"110 5-1","pages":"054304"},"PeriodicalIF":2.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recurrence solution of monomer-polymer models on two-dimensional rectangular lattices.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054135

Yong Kong

引用次数: 0

Scaling behavior of cross-entropy loss in the identification of percolation phase transitions.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054133

Huiyao Li, Yu Zhao, Bo Yang

{"title":"Scaling behavior of cross-entropy loss in the identification of percolation phase transitions.","authors":"Huiyao Li, Yu Zhao, Bo Yang","doi":"10.1103/PhysRevE.110.054133","DOIUrl":"https://doi.org/10.1103/PhysRevE.110.054133","url":null,"abstract":"The cross-entropy loss function is widely used in machine learning to measure the performance of a classification model. Interestingly, our study find that this function has scaling behavior when deep neural networks are used to investigate percolation models. Specifically, we use convolutional neural networks with different pooling methods to study the site percolation on square lattices under two labeling methods (labeling based on spanning cluster and the exact solution of the critical point). Subsequently, graph convolutional neural networks (GCNs) with different pooling methods are utilized to do the same kind of experiment. Finally, the GCN with different pooling methods is used to study the percolation phase transitions on the Erdős-Rényi (ER) networks under labeling based on the critical point. The reliability of the classifiers is detected by the values of the critical point p_{c} and critical exponent ν which are obtained by the scaling behaviors of the percolation probability. The results demonstrate that the scaling exponent of cross-entropy ψ/ν depends on the labeling and pooling methods. Labeling based on critical points, which is equivalent to labeling based on spanning clusters in infinite systems, can be used to investigate the critical behaviors in finite systems. SAGPooling-Mean is an effective pooling method to study the scaling behavior of cross-entropy loss on two-dimensional square lattices and ER networks.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"110 5-1","pages":"054133"},"PeriodicalIF":2.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of external potential on the energy transport in harmonically driven segmented Frenkel-Kontorova lattices.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054115

M Romero-Bastida

{"title":"Effect of external potential on the energy transport in harmonically driven segmented Frenkel-Kontorova lattices.","authors":"M Romero-Bastida","doi":"10.1103/PhysRevE.110.054115","DOIUrl":"https://doi.org/10.1103/PhysRevE.110.054115","url":null,"abstract":"Thermal resonance, that is, the heat flux obtained by means of a periodic external driving, offers the possibility of controlling heat flux in nanoscale devices suitable for power generation, cooling, and thermoelectrics, among others. In this work we study the effect of the onsite potential period on the thermal resonance phenomenon present in a one-dimensional system composed of two dissimilar Frenkel-Kontorova lattices connected by a time-modulated coupling and in contact with two heat reservoirs operating at different temperature by means of molecular dynamics simulations. When the periods of the onsite potential on both sides of the system are equal, the maximum resonance is obtained for the lowest considered value of the period. For highly structurally asymmetric lattices, the heat flux toward the cold reservoir is maximized, and asymmetric periods of the onsite potential afford an extra way to control the magnitude of the heat fluxes in each side of the system. Our results highlight the importance of the substrate structure on thermal resonance and could inspire further developments in designing thermal devices.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"110 5-1","pages":"054115"},"PeriodicalIF":2.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Current-vortex-sheet model of the magnetic Rayleigh-Taylor instability.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.055102

Seunghyeon Baek, Sung-Ik Sohn

{"title":"Current-vortex-sheet model of the magnetic Rayleigh-Taylor instability.","authors":"Seunghyeon Baek, Sung-Ik Sohn","doi":"10.1103/PhysRevE.110.055102","DOIUrl":"https://doi.org/10.1103/PhysRevE.110.055102","url":null,"abstract":"This study investigates the Rayleigh-Taylor instability in the magnetic field applied parallel to the interface. The motion of the interface is described using a current-vortex-sheet model. The growth rate of the interface is obtained from a linear stability analysis of the model. The interface of a single mode k=1 is linearly stable for R_{A}≤1, where R_{A} denotes the Alfvén number. Further, we conduct numerical computations for the evolution of the interface from the model for both regimes of R_{A}≤1 and R_{A}>1. For R_{A}≤1, the interface oscillates vertically but does not intrude into the opposite phase. The amplitude of the interface and the oscillation period decrease with decrease in R_{A}. For 1<R_{A}≲1.5, the interface undergoes some growth at early times and then decreases. This oscillation is repeated, and no roll-ups are observed at the interface. Therefore, the nonlinear growth of the Rayleigh-Taylor instability is stabilized by a sufficiently strong magnetic field. For R_{A}≳3 the interface is unstable and the pattern of the interface evolution differs from the density ratio. In addition, the magnetic field is greatly amplified as R_{A} increases.","PeriodicalId":20085,"journal":{"name":"Physical review. E","volume":"110 5-2","pages":"055102"},"PeriodicalIF":2.4,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142847302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Narrow escape with imperfect reactions.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054127

Anıl Cengiz, Sean D Lawley

引用次数: 0

Evidence that the de Almeida-Thouless transition disappears below six dimensions.

IF 2.4 3区物理与天体物理

Physical review. E Pub Date : 2024-11-01 DOI: 10.1103/PhysRevE.110.054131

Bharadwaj Vedula, M A Moore, Auditya Sharma

引用次数: 0

Emergence of self-organized criticality and phase transition in the Olami-Feder-Christensen model with a single defect.