Journal of Physics Communications最新文献_第2页

Dynamical active particles in the overdamped limit 过阻尼极限中的动态活动粒子

IF 1.2

Journal of Physics Communications Pub Date : 2024-07-02 DOI: 10.1088/2399-6528/ad5b38

Diego M Fieguth

{"title":"Dynamical active particles in the overdamped limit","authors":"Diego M Fieguth","doi":"10.1088/2399-6528/ad5b38","DOIUrl":"https://doi.org/10.1088/2399-6528/ad5b38","url":null,"abstract":"Mobile microscopic bodies, such as motile cells, can be modelled phenomenologically as ‘active particles’ which can move against external forces by depleting an internal energy depot. The microscopic mechanisms underlying such ‘active’ behaviour must ultimately obey fundamental physics: energy depots must actually consist of dynamical degrees of freedom, such as chemical reaction coordinates, which in some way couple to the particle’s motional degrees of freedom. As a step towards connecting phenomenological models with microscopic dynamical mechanisms, recent papers have studied the minimalistic dynamical mechanism of a ‘dynamical active particle’, and shown how nonlinear couplings can allow steady energy transfer from depot to motion, even in the presence of weak dissipation. Most real active particles move through viscous environments, however, and are strongly damped. Here we therefore generalize the dynamical active particle into the overdamped regime. We find that its mechanism still operates, and in particular allows the overdamped active particle to travel just as far against friction as the undamped model, by moving at a slower average speed. Our results suggest that active particle phenomenology can indeed be consistent with comprehensible dynamical mechanisms, even in strongly dissipative environments.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"76 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wavefunction collapse driven by non-Hermitian disturbance 非赫米提干扰驱动的波函数坍缩

IF 1.2

Journal of Physics Communications Pub Date : 2024-07-01 DOI: 10.1088/2399-6528/ad5b37

Jorge Martínez Romeral, Luis E F Foa Torres and Stephan Roche

引用次数: 0

Simple circuit and experimental proposal for the detection of gauge-waves 探测规波的简单电路和实验建议

IF 1.2

Journal of Physics Communications Pub Date : 2024-05-29 DOI: 10.1088/2399-6528/ad4e98

F Minotti and G Modanese

引用次数: 0

Entanglement entropy of the maximum geminal of the BCS ground state BCS 基本态最大 geminal 的纠缠熵

IF 1.2

Journal of Physics Communications Pub Date : 2024-04-17 DOI: 10.1088/2399-6528/ad3b63

Katsuhiko Higuchi, Itsuki Tanno, Ryo Ito, Masahiko Higuchi

引用次数: 0

Local resetting in non-conserving zero-range processes with extensive rates 具有广泛速率的非守恒零程过程中的局部重置

IF 1.2

Journal of Physics Communications Pub Date : 2024-04-17 DOI: 10.1088/2399-6528/ad3b62

Pascal Grange

{"title":"Local resetting in non-conserving zero-range processes with extensive rates","authors":"Pascal Grange","doi":"10.1088/2399-6528/ad3b62","DOIUrl":"https://doi.org/10.1088/2399-6528/ad3b62","url":null,"abstract":"A non-conserving zero-range process with extensive creation, annihilation and hopping rates is subjected to local resetting. The model is formulated on a large, fully-connected network of states. The states are equipped with a (bounded) fitness level: particles are added to each state at a rate proportional to the fitness level of the state. Moreover, particles are annihilated at a constant rate, and hop at a fixed rate to a uniformly-drawn state in the network. This model has been interpreted in terms of population dynamics: the fitness is the reproductive fitness in a haploid population, and the hopping process models mutation. It has also been interpreted as a model of network growth with a fixed set of nodes (in which particles occupying a state are interpreted as links pointing to this state). In the absence of resetting, the model is known to reach a steady state, which in a certain limit may exhibit a condensate at maximum fitness. If the model is subjected to global resetting by annihilating all particles at Poisson-distributed times, there is no condensation in the steady state. If the system is subjected to local resetting, the occupation numbers of each state are reset to zero at independent random times. These times are distributed according to a Poisson process whose rate (the resetting rate) depends on the fitness. We derive the evolution equation satisfied by the probability law of the occupation numbers. We calculate the average occupation numbers in the steady state. The existence of a condensate is found to depend on the local behavior of the resetting rate at maximum fitness: if the resetting rate vanishes at least linearly at high fitness, a condensate appears at maximum fitness in the limit where the sum of the annihilation and hopping rates is equal to the maximum fitness.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140616032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the weighted conical Radon transform 加权锥形拉顿变换分析

IF 1.2

Journal of Physics Communications Pub Date : 2024-03-27 DOI: 10.1088/2399-6528/ad2b8d

Nguyen Ngoc Duy

引用次数: 0

Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling 利用动态解耦快速连贯控制钻石中与氮空位中心相关的氮-14 自旋

IF 1.2

Journal of Physics Communications Pub Date : 2024-03-07 DOI: 10.1088/2399-6528/ad2b8b

Kosuke Mizuno, Ikuya Fujisaki, Hiroyoshi Tomioka, Hitoshi Ishiwata, Shinobu Onoda, Takayuki Iwasaki, Keigo Arai, Mutsuko Hatano

{"title":"Fast coherent control of nitrogen-14 spins associated with nitrogen-vacancy centers in diamonds using dynamical decoupling","authors":"Kosuke Mizuno, Ikuya Fujisaki, Hiroyoshi Tomioka, Hitoshi Ishiwata, Shinobu Onoda, Takayuki Iwasaki, Keigo Arai, Mutsuko Hatano","doi":"10.1088/2399-6528/ad2b8b","DOIUrl":"https://doi.org/10.1088/2399-6528/ad2b8b","url":null,"abstract":"A nitrogen-vacancy (NV) center in a diamond enables the access to an electron spin, which is expected to present highly sensitive quantum sensors. Although exploiting a nitrogen nuclear spin improves the sensitivity, manipulating it using a resonant pulse requires a long gate time owing to its small gyromagnetic ratio. Another technique to control nuclear spins is a conditional rotation gate based on dynamical decoupling, which is faster but unavailable for nitrogen spins owing to the lack of transverse hyperfine coupling with the electron spin. In this study, we generated effective transverse coupling by applying a weak off-axis magnetic field. An effective coupling depends on the off-axis field; the conditional rotation gate on the nitrogen-14 spins of an NV center was demonstrated within 4.2 <italic toggle=\"yes\">μ</italic>s under an 1.8% off-axis field and a longitudinal field of approximately 280 mT. We estimated that a population transfer from the electron to nitrogen spins can be implemented with 8.7 <italic toggle=\"yes\">μ</italic>s. Our method is applicable to an ensemble of NV centers, in addition to a single NV center.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"8 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140316764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of Jacobi stability analysis to a first-order dynamical system: relation between nonlinearizability of one-dimensional differential equation and Jacobi stable region 雅可比稳定性分析在一阶动力系统中的应用：一维微分方程的非线性化与雅可比稳定区域之间的关系

IF 1.2

Journal of Physics Communications Pub Date : 2024-03-05 DOI: 10.1088/2399-6528/ad2b8c

Yuma Hirakui, Takahiro Yajima

{"title":"Application of Jacobi stability analysis to a first-order dynamical system: relation between nonlinearizability of one-dimensional differential equation and Jacobi stable region","authors":"Yuma Hirakui, Takahiro Yajima","doi":"10.1088/2399-6528/ad2b8c","DOIUrl":"https://doi.org/10.1088/2399-6528/ad2b8c","url":null,"abstract":"In this study, we discuss Jacobi stability in equilibrium and nonequilibrium regions for a first-order one-dimensional system using deviation curvatures. The deviation curvature is calculated using the Kosambi-Cartan-Chern theory, which is applied to second-order differential equations. The deviation curvatures of the first-order one-dimensional differential equations are calculated using two methods as follows. Method 1 is only differentiating both sides of the equation. Additionally, Method 2 is differentiating both sides of the equation and then substituting the original equation into the second-order system. From the general form of the deviation curvatures calculated using each method, the analytical results are obtained as (A), (B), and (C). (A) Equilibrium points are Jacobi unstable for both methods; however, the type of equilibrium points is different. In Method 1, the equilibrium point is a nonisolated fixed point. Conversely, the equilibrium point is a saddle point in Method 2. (B) When there is a Jacobi stable region, the size of the Jacobi stable region in the Method 1 is different from that in Method 2. Especially, the Jacobi stable region in Method 1 is always larger than that in Method 2. (C) When there are multiple equilibrium points, the Jacobi stable region always exists in the nonequilibrium region located between the equilibrium points. These results are confirmed numerically using specific dynamical systems, which are given by the logistic equation and its evolution equation with the Hill function. From the results of (A) and (B), differences in types of equilibrium points affect the size of the Jacobi stable region. From (C), the Jacobi stable regions appear as nonequilibrium regions where the equations cannot be linearized.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140312030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inkjet-printed quantum dots on paper as concept towards high-density long-term data storage 纸张上的喷墨打印量子点是实现高密度长期数据存储的概念

IF 1.2

Journal of Physics Communications Pub Date : 2024-02-12 DOI: 10.1088/2399-6528/ad246d

Nils Mengel, Marius Welzel, Woldemar Niedenthal, Markus Stein, Dominik Heider, Sangam Chatterjee

{"title":"Inkjet-printed quantum dots on paper as concept towards high-density long-term data storage","authors":"Nils Mengel, Marius Welzel, Woldemar Niedenthal, Markus Stein, Dominik Heider, Sangam Chatterjee","doi":"10.1088/2399-6528/ad246d","DOIUrl":"https://doi.org/10.1088/2399-6528/ad246d","url":null,"abstract":"Handling and storing the immense amounts of data native to the information age is a major challenge in terms of technological sustainability and energy demand. To date, tape storage remains the most widespread method for data archiving, while DNA data storage appears to offer the best data density and long-term stability in the future. However, DNA data storage is still in its infancy primarily due to economic and accessibility challenges. This emphasizes the need for more practical and readily available alternatives. We present a method for data storage utilizing inkjet printable quantum dots on paper with photoluminescence (PL) readout. Our proof of principle study showcases the ability to print and stack multiple bits of data on a single spot by exploiting the unique PL properties of quantum dots. This approach utilizes easily accessible resources, including a consumer-grade printer and paper as the substrate. Additionally, we perform initial stability tests, investigate scalability by controlling emission intensity, and evaluate the potential data density achievable by our approach.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"28 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron density analysis of two-electron systems confined by prolate spheroids with hard walls 由硬壁增大球体限制的双电子系统的电子密度分析

IF 1.2

Journal of Physics Communications Pub Date : 2024-02-12 DOI: 10.1088/2399-6528/ad246e

Heichi Yanajara-Parra, Adalberto Corella-Madueño, F Adrián Duarte-Alcaraz, Rubicelia Vargas, Jorge Garza

{"title":"Electron density analysis of two-electron systems confined by prolate spheroids with hard walls","authors":"Heichi Yanajara-Parra, Adalberto Corella-Madueño, F Adrián Duarte-Alcaraz, Rubicelia Vargas, Jorge Garza","doi":"10.1088/2399-6528/ad246e","DOIUrl":"https://doi.org/10.1088/2399-6528/ad246e","url":null,"abstract":"The electron density of two-electron systems, He and H<sub>2</sub>, was analyzed when prolate spheroids with hard walls confine these systems. For this purpose, Hartree–Fock equations were solved using Roothaan's approach with a basis set defined in prolate spheroidal coordinates imposing Dirichlet boundary conditions. Total energy, its components, and orbital energies were analyzed for several confinements, and some of these results were compared with those reported by other authors to test the performance of the proposed approach. For both systems, the electron density exhibits a maximum value out of the nuclear region for extreme confinements. The chemical bond for H<sub>2</sub> was analyzed through the concepts of the quantum theory of atoms in molecules, concluding that the chemical bond of this molecule disappears under extreme conditions. For this system, estimations of the correlation energy indicate that this is a small contribution to the total energy, and the Hartree–Fock method contains the necessary elements to describe the chemical bond for strong confinements.","PeriodicalId":47089,"journal":{"name":"Journal of Physics Communications","volume":"37 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139767882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0