Pub Date : 2023-12-13DOI: 10.1088/1674-1056/ad14ff
Yao-long Li, S. Li, M. Wang, R. Zhang
Controlling mass transportation using intrinsic mechanisms is a challenging topic in nanotechnology. Herein, we employ molecular dynamics simulations to investigate the mass transport inside carbon nanotubes with temperature gradients, specifically the effects of adding a static carbon hoop to the outside of a CNT on the transport of a nanomotor inside the CNT. We reveal that the underlying mechanism is the uneven potential energy created by the hoops, i.e., the hoop outside the CNT forms potential energy barriers or wells that affect mass transport inside the CNT. This fundamental control of directional mass transportation may lead to promising routes for nanoscale actuation and energy conversion.
{"title":"Controlled thermally-driven mass transport in carbon nanotubes using carbon hoops","authors":"Yao-long Li, S. Li, M. Wang, R. Zhang","doi":"10.1088/1674-1056/ad14ff","DOIUrl":"https://doi.org/10.1088/1674-1056/ad14ff","url":null,"abstract":"\u0000 Controlling mass transportation using intrinsic mechanisms is a challenging topic in nanotechnology. Herein, we employ molecular dynamics simulations to investigate the mass transport inside carbon nanotubes with temperature gradients, specifically the effects of adding a static carbon hoop to the outside of a CNT on the transport of a nanomotor inside the CNT. We reveal that the underlying mechanism is the uneven potential energy created by the hoops, i.e., the hoop outside the CNT forms potential energy barriers or wells that affect mass transport inside the CNT. This fundamental control of directional mass transportation may lead to promising routes for nanoscale actuation and energy conversion.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"23 S1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139004767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-12DOI: 10.1088/1674-1056/ad1484
K. Coker, Chuyuan Zheng, Joseph Roger Arhin, Kwame Opuni-Boachie Obour Agyekum, Weili Zhang
This study investigates the properties of exciton-polaritons in a 2D hybrid organic-inorganic perovskite microcavity in the presence of optical Stark effect. Through both steady and dynamic state analyses, strong coupling between excitons of perovskite and cavity photons is revealed, indicating the formation of polaritons in the perovskite microcavity. Besides, it is found that an external optical Stark pulse can induce energy shifts of excitons proportional to the pulse intensity, which modifies the dispersion characteristics of the polaritons.
{"title":"Exciton-polaritons in a 2D hybrid organic-inorganic perovskite microcavity with the presence of optical Stark effect","authors":"K. Coker, Chuyuan Zheng, Joseph Roger Arhin, Kwame Opuni-Boachie Obour Agyekum, Weili Zhang","doi":"10.1088/1674-1056/ad1484","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1484","url":null,"abstract":"\u0000 This study investigates the properties of exciton-polaritons in a 2D hybrid organic-inorganic perovskite microcavity in the presence of optical Stark effect. Through both steady and dynamic state analyses, strong coupling between excitons of perovskite and cavity photons is revealed, indicating the formation of polaritons in the perovskite microcavity. Besides, it is found that an external optical Stark pulse can induce energy shifts of excitons proportional to the pulse intensity, which modifies the dispersion characteristics of the polaritons.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"61 3‐4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
This paper deals with wave propagation and power coupling in blue-core helicon plasma driven by various antennas and frequencies. It is found that compared to non-blue-core mode, for blue-core mode, the wave can propagate in the core region, and it decays sharply outside the core. The power absorption is lower and steeper in radius for blue-core mode. Regarding the effects of antenna geometry for blue-core mode, it shows that half helix antenna yields the strongest wave field and power absorption, while loop antenna yields the lowest. Moreover, near axis, for antennas with m = +1, the wave field increases with axial distance. In the core region, the wave number approaches to a saturation value at much lower frequency for non-blue-core mode compared to blue-core mode. The total loading resistance is much lower for blue-core mode. These findings are valuable to understanding the physics of blue-core helicon discharge and optimizing the experimental performance of blue-core helicon plasma sources for applications such as space propulsion and material treatment.
本文讨论了不同天线和频率驱动的蓝核螺旋子等离子体中的波传播和功率耦合。研究发现，与非蓝核模式相比，蓝核模式的波可以在核心区域传播，并在核心之外急剧衰减。蓝芯模式的功率吸收较低，半径较陡。天线几何形状对蓝核模式的影响表明，半螺旋天线产生的波场和功率吸收最强，而环形天线产生的波场和功率吸收最小。此外，在轴附近，对于 m = +1 的天线，波场随轴向距离的增加而增大。在核心区域，非蓝核模式的波数接近饱和值的频率远低于蓝核模式。蓝芯模式的总负载电阻要小得多。这些发现对于理解蓝核螺旋子放电的物理原理以及优化蓝核螺旋子等离子体源在太空推进和材料处理等应用领域的实验性能非常有价值。
{"title":"Wave field structure and power coupling features of blue-core helicon plasma driven by various antenna geometries and frequencies","authors":"Chao Wang, Jia Liu, Lei Chang, Ling-Feng Lu, Shi-Jie Zhang, Fan-Tao Zhou","doi":"10.1088/1674-1056/ad1486","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1486","url":null,"abstract":"\u0000 This paper deals with wave propagation and power coupling in blue-core helicon plasma driven by various antennas and frequencies. It is found that compared to non-blue-core mode, for blue-core mode, the wave can propagate in the core region, and it decays sharply outside the core. The power absorption is lower and steeper in radius for blue-core mode. Regarding the effects of antenna geometry for blue-core mode, it shows that half helix antenna yields the strongest wave field and power absorption, while loop antenna yields the lowest. Moreover, near axis, for antennas with m = +1, the wave field increases with axial distance. In the core region, the wave number approaches to a saturation value at much lower frequency for non-blue-core mode compared to blue-core mode. The total loading resistance is much lower for blue-core mode. These findings are valuable to understanding the physics of blue-core helicon discharge and optimizing the experimental performance of blue-core helicon plasma sources for applications such as space propulsion and material treatment.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"4 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-12DOI: 10.1088/1674-1056/ad1487
Shiping Zhang, Fangjun Zhang, Denghong Zhang, Xiaobin Ding, Jun Jiang, Luyou Xie, Yulong Ma, Maijuan Li, Marek Sikorski, Chenzhong Dong
The electron-impact single ionization cross section for W8+ ion has been calculated using flexible atomic code, employing the level-to-level distorted-wave approximation. This calculations takes into account contributions form both direct ionization (DI) and excitation autoionization (EA). However, the theoretical predictions, based solely on the ground state, tends to underestimated the experimental values. This discrepancy can be mitigated by incorporation contributions from excited states. We extended the theoretical analysis, including the contributions from the long-lived metastable states with lifetimes exceeding 1.5 × 10-5s. We employed two statistical models to predict the fraction of ground state ions in the parent ion beam. Assuming a 79% fraction of parent ions in ground configuration, the experiment measurements align with the predictions. Furthermore we derived the theoretical cross-section for the ground state as correlated plasma rate coefficients, and compared it with existing data. Despite the uncertainty in our calculations, our results are still acceptable.
{"title":"Theoretical investigation of electron-impact ionization of W8+ ion","authors":"Shiping Zhang, Fangjun Zhang, Denghong Zhang, Xiaobin Ding, Jun Jiang, Luyou Xie, Yulong Ma, Maijuan Li, Marek Sikorski, Chenzhong Dong","doi":"10.1088/1674-1056/ad1487","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1487","url":null,"abstract":"\u0000 The electron-impact single ionization cross section for W8+ ion has been calculated using flexible atomic code, employing the level-to-level distorted-wave approximation. This calculations takes into account contributions form both direct ionization (DI) and excitation autoionization (EA). However, the theoretical predictions, based solely on the ground state, tends to underestimated the experimental values. This discrepancy can be mitigated by incorporation contributions from excited states. We extended the theoretical analysis, including the contributions from the long-lived metastable states with lifetimes exceeding 1.5 × 10-5s. We employed two statistical models to predict the fraction of ground state ions in the parent ion beam. Assuming a 79% fraction of parent ions in ground configuration, the experiment measurements align with the predictions. Furthermore we derived the theoretical cross-section for the ground state as correlated plasma rate coefficients, and compared it with existing data. Despite the uncertainty in our calculations, our results are still acceptable.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"40 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Brain is a complex network system in which a large number of neurons are widely connected to each other and transmit signals to each other. The memory characteristic of memristors makes them suitable for simulating neuronal synapses with plasticity. In this paper, a memristor is used to simulate synapse, and a discrete small-world neuronal network is constructed based on Rulkov neurons and its dynamical behavior is explored. We explore the influence of system parameter on the dynamical behaviors of the discrete small-world network, and the system shows a variety of firing patterns such as spiking firing and triangular bursting firing when the neuronal parameter α is changed. The numerical simulation results based on Matlab show that the network topology can affect the synchronous firing behavior of the neuronal network, and the higher the reconnection probability, the number of nearest neurons, and the more significant the synchronization state of neurons. In addition, by increasing the coupling strength of memristor synapses, synchronization performance is promoted. The results of this paper can boost the research process of complex neuronal networks coupled with memristor synapse and further promote the development of neuroscience.
{"title":"Dynamical Behaviors in Discrete Memristor-Coupled Small-world Neuronal Networks","authors":"Jieyu Lu, Xiaohua Xie, Yaping Lu, Yalian Wu, Chunlai Li, Minglin Ma","doi":"10.1088/1674-1056/ad1483","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1483","url":null,"abstract":"\u0000 Brain is a complex network system in which a large number of neurons are widely connected to each other and transmit signals to each other. The memory characteristic of memristors makes them suitable for simulating neuronal synapses with plasticity. In this paper, a memristor is used to simulate synapse, and a discrete small-world neuronal network is constructed based on Rulkov neurons and its dynamical behavior is explored. We explore the influence of system parameter on the dynamical behaviors of the discrete small-world network, and the system shows a variety of firing patterns such as spiking firing and triangular bursting firing when the neuronal parameter α is changed. The numerical simulation results based on Matlab show that the network topology can affect the synchronous firing behavior of the neuronal network, and the higher the reconnection probability, the number of nearest neurons, and the more significant the synchronization state of neurons. In addition, by increasing the coupling strength of memristor synapses, synchronization performance is promoted. The results of this paper can boost the research process of complex neuronal networks coupled with memristor synapse and further promote the development of neuroscience.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"12 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139009047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-12DOI: 10.1088/1674-1056/ad147f
Shuai Huang, Jie Chen, Meng-Yu Li, Yuan-Hao Xu, Mao-Bin Hu
Social interactions account for the spread of epidemics in population. In this paper, we investigate the impact of pairwise and group interactions on the spread of epidemics through an activity-driven model based on time-dependent networks. The effects of pairwise/group interaction proportion and pairwise/group interaction intensity are explored by extensive simulation and theoretical analysis. It is demonstrated that altering the group interaction proportion can either hinder or enhance the spread of epidemics, depending on the relative social intensity of group and pairwise interactions. As the group interaction proportion decreases, the impact of reducing group social intensity diminishes. The ratio of group and pairwise social intensity can affect the effect of group interaction proportion on the scale of infection. A weak heterogeneous activity distribution can raise the epidemic threshold, and reduce the scale of infection. These results benefit the design of epidemic control strategy.
{"title":"Impact of different interaction behavior on epidemic spreading in time-dependent social networks","authors":"Shuai Huang, Jie Chen, Meng-Yu Li, Yuan-Hao Xu, Mao-Bin Hu","doi":"10.1088/1674-1056/ad147f","DOIUrl":"https://doi.org/10.1088/1674-1056/ad147f","url":null,"abstract":"\u0000 Social interactions account for the spread of epidemics in population. In this paper, we investigate the impact of pairwise and group interactions on the spread of epidemics through an activity-driven model based on time-dependent networks. The effects of pairwise/group interaction proportion and pairwise/group interaction intensity are explored by extensive simulation and theoretical analysis. It is demonstrated that altering the group interaction proportion can either hinder or enhance the spread of epidemics, depending on the relative social intensity of group and pairwise interactions. As the group interaction proportion decreases, the impact of reducing group social intensity diminishes. The ratio of group and pairwise social intensity can affect the effect of group interaction proportion on the scale of infection. A weak heterogeneous activity distribution can raise the epidemic threshold, and reduce the scale of infection. These results benefit the design of epidemic control strategy.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"25 4","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-12DOI: 10.1088/1674-1056/ad1485
Liu Li, Decai Li, Zhiqiang Qi, Lu Wang, Zhili Zhang
In this study, the explicit analytical solution of Rosensweig instability spikes’ shapes obtained by Navier-Stokes equation in diverse magnetic field H vertical to the flat free surface of ferrofluids are systematically studied experimentally and theoretically. After carefully analyzing and solving the Navier-Stokes equation in elliptic form, the force balanced surface equations of spikes in Rosensweig instability are expressed as cosine wave in perturbated magnetic field and hyperbolic tangent in large magnetic field, whose results both reveal the wave-like nature of Rosensweig instability. The results of hyperbolic tangent form are perfectly fitted to the experimental results in this paper, which indicates that the analytical solution is basically correct. Using the forementioned theoretical results, the total energy of the spike distribution pattern is calculated. By analyzing the energy components under different magnetic field intensities H, the hexagon-square transition of Rosensweig instability is systematically discussed and explained in an explicit way.
本研究通过实验和理论系统地研究了在垂直于铁流体平坦自由表面的不同磁场 H 中，用纳维-斯托克斯方程求得的罗森斯韦格不稳定性尖峰形状的显式解析解。在对椭圆形式的纳维-斯托克斯方程进行仔细分析和求解后，罗森斯韦格不稳定中的尖峰受力平衡面方程在扰动磁场中表示为余弦波，在大磁场中表示为双曲正切，其结果都揭示了罗森斯韦格不稳定的波状性质。双曲正切形式的结果与本文的实验结果完全吻合，说明解析解基本正确。利用上述理论结果，计算了尖峰分布模式的总能量。通过分析不同磁场强度 H 下的能量分量，系统地讨论并明确解释了罗森斯韦格不稳定性的六方转变。
{"title":"The wave nature of Rosensweig instability","authors":"Liu Li, Decai Li, Zhiqiang Qi, Lu Wang, Zhili Zhang","doi":"10.1088/1674-1056/ad1485","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1485","url":null,"abstract":"\u0000 In this study, the explicit analytical solution of Rosensweig instability spikes’ shapes obtained by Navier-Stokes equation in diverse magnetic field H vertical to the flat free surface of ferrofluids are systematically studied experimentally and theoretically. After carefully analyzing and solving the Navier-Stokes equation in elliptic form, the force balanced surface equations of spikes in Rosensweig instability are expressed as cosine wave in perturbated magnetic field and hyperbolic tangent in large magnetic field, whose results both reveal the wave-like nature of Rosensweig instability. The results of hyperbolic tangent form are perfectly fitted to the experimental results in this paper, which indicates that the analytical solution is basically correct. Using the forementioned theoretical results, the total energy of the spike distribution pattern is calculated. By analyzing the energy components under different magnetic field intensities H, the hexagon-square transition of Rosensweig instability is systematically discussed and explained in an explicit way.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"1 8","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-12DOI: 10.1088/1674-1056/ad1482
Zhi-Wei Ma, Lei Sun, Zhi-Guo Ding, Yi-Zhen Huang, Zhao-Long Hu
While progress has been made in information source localization, it has overlooked the prevalent friend and adversarial relationships in social networks. This paper addresses this gap by focusing on source localization in signed network models. Leveraging the topological characteristics of signed networks and transforming the propagation probability into effective distance, we propose an optimization method for observer selection. Additionally, by using the reverse propagation algorithm we present a method for information source localization in signed networks. Extensive experimental results demonstrate that a higher proportion of positive edges within signed networks contributes to more favorable source localization, and the higher the ratio of propagation rates between positive and negative edges, the more accurate the source localization becomes. Interestingly, this aligns with our observation that, in reality, the number of friends tends to be greater than the number of adversaries, and the likelihood of information propagation among friends is often higher than among adversaries. In addition, the source located at the periphery of the network is not easy to identify. Furthermore, our proposed observer selection method based on effective distance achieves higher operational effciency and exhibits higher accuracy in information source localization, compared with three strategies for observer selection based on the classical Full-order neighbor coverage.
{"title":"Source localization in signed networks with effective distance","authors":"Zhi-Wei Ma, Lei Sun, Zhi-Guo Ding, Yi-Zhen Huang, Zhao-Long Hu","doi":"10.1088/1674-1056/ad1482","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1482","url":null,"abstract":"\u0000 While progress has been made in information source localization, it has overlooked the prevalent friend and adversarial relationships in social networks. This paper addresses this gap by focusing on source localization in signed network models. Leveraging the topological characteristics of signed networks and transforming the propagation probability into effective distance, we propose an optimization method for observer selection. Additionally, by using the reverse propagation algorithm we present a method for information source localization in signed networks. Extensive experimental results demonstrate that a higher proportion of positive edges within signed networks contributes to more favorable source localization, and the higher the ratio of propagation rates between positive and negative edges, the more accurate the source localization becomes. Interestingly, this aligns with our observation that, in reality, the number of friends tends to be greater than the number of adversaries, and the likelihood of information propagation among friends is often higher than among adversaries. In addition, the source located at the periphery of the network is not easy to identify. Furthermore, our proposed observer selection method based on effective distance achieves higher operational effciency and exhibits higher accuracy in information source localization, compared with three strategies for observer selection based on the classical Full-order neighbor coverage.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"14 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139008690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-08DOI: 10.1088/1674-1056/ad1380
Yu-Xian Yang, Chang-Wen Zhang
We propose a scheme for realizing spin-direction dependent Quantum Anomalous Hall Effect (QAHE) driven by spin-orbit couplings (SOC) strength in two-dimensional (2D) materials. Based on the sp 3 tight-binding (TB) model, we find that these systems can harbor QAHE with out-of-plane and in-plane magnetization for the weak and strong SOC, respectively, in which the mechanism of quantum transition is mainly driven by the band inversion of p x,y /p z orbitals. As a concrete example, based on first-principles calculations, we realize a real material of monolayer 1T-SnN2/PbN2 to exhibit QAHE with in-plane/out-of-plane magnetization characterized by the nonzero Chern number C and topological edge states. These findings provide useful guidance for the pursuit of spin-direction-dependent QAHE and hence stimulate immediate experimental interest.
{"title":"Spin-direction dependent Quantum Anomalous Hall effect in two-dimensional ferromagnetic materials","authors":"Yu-Xian Yang, Chang-Wen Zhang","doi":"10.1088/1674-1056/ad1380","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1380","url":null,"abstract":"\u0000 We propose a scheme for realizing spin-direction dependent Quantum Anomalous Hall Effect (QAHE) driven by spin-orbit couplings (SOC) strength in two-dimensional (2D) materials. Based on the sp\u0000 \u0000 3\u0000 tight-binding (TB) model, we find that these systems can harbor QAHE with out-of-plane and in-plane magnetization for the weak and strong SOC, respectively, in which the mechanism of quantum transition is mainly driven by the band inversion of p\u0000 \u0000 x,y\u0000 /p\u0000 \u0000 z\u0000 orbitals. As a concrete example, based on first-principles calculations, we realize a real material of monolayer 1T-SnN2/PbN2 to exhibit QAHE with in-plane/out-of-plane magnetization characterized by the nonzero Chern number C and topological edge states. These findings provide useful guidance for the pursuit of spin-direction-dependent QAHE and hence stimulate immediate experimental interest.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"44 15","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138588410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Pub Date : 2023-12-08DOI: 10.1088/1674-1056/ad1383
S. J, Z. D, Liu H Q, Jiang R, Yu Z X
With the progression of intelligent and interconnected traffic system, a convergence of traffic stream is anticipated in the foreseeable future, where both connected automated vehicle (CAV) and human driven vehicle (HDV) will coexist. In order to examine the effect of CAV on the overall stability and energy consumption of such heterogeneous traffic system, we first take into account the interrelated perception of distance and speed by CAV to establish a macroscopic dynamic model utilizing the full velocity difference (FVD) model. Subsequently, drawing upon the linear stability theory, we propose the linear stability condition for the model using the small perturbation method，and the validity of the heterogeneous model is verified comparing with the FVD model. Through nonlinear theoretical analysis, we further derive the KdV-Burgers equation, which captures the propagation characteristics of traffic density waves. Finally, by means of numerical simulation experiments utilizing a macroscopic model of heterogeneous traffic flow, the effect of CAV permeability on the stability of density waves in heterogeneous traffic flow and the energy consumption of the traffic system is investigated. Subsequent analysis reveals emergent traffic phenomena. The experimental findings demonstrate that as CAV permeability increases, the ability to dampen the propagation of fluctuations in heterogeneous traffic flow gradually intensifies when giving system perturbation, leading to enhanced stability of the traffic system. Furthermore, higher initial traffic density renders the traffic system more susceptible to congestion, resulting in local clustering effect and stop-and-go traffic phenomenon. Remarkably, the total energy consumption of the heterogeneous traffic system exhibits a gradual decline with increasing CAV permeability. Further evidence has demonstrated the positive impact of CAV on heterogeneous traffic flow. This research contributes to providing theoretical guidance for future CAV applications, aiming to enhance urban road traffic efficiency and alleviate congestion.
{"title":"Effects of CAV on the stability and energy consumption of heterogeneous traffic flow system","authors":"S. J, Z. D, Liu H Q, Jiang R, Yu Z X","doi":"10.1088/1674-1056/ad1383","DOIUrl":"https://doi.org/10.1088/1674-1056/ad1383","url":null,"abstract":"\u0000 With the progression of intelligent and interconnected traffic system, a convergence of traffic stream is anticipated in the foreseeable future, where both connected automated vehicle (CAV) and human driven vehicle (HDV) will coexist. In order to examine the effect of CAV on the overall stability and energy consumption of such heterogeneous traffic system, we first take into account the interrelated perception of distance and speed by CAV to establish a macroscopic dynamic model utilizing the full velocity difference (FVD) model. Subsequently, drawing upon the linear stability theory, we propose the linear stability condition for the model using the small perturbation method，and the validity of the heterogeneous model is verified comparing with the FVD model. Through nonlinear theoretical analysis, we further derive the KdV-Burgers equation, which captures the propagation characteristics of traffic density waves. Finally, by means of numerical simulation experiments utilizing a macroscopic model of heterogeneous traffic flow, the effect of CAV permeability on the stability of density waves in heterogeneous traffic flow and the energy consumption of the traffic system is investigated. Subsequent analysis reveals emergent traffic phenomena. The experimental findings demonstrate that as CAV permeability increases, the ability to dampen the propagation of fluctuations in heterogeneous traffic flow gradually intensifies when giving system perturbation, leading to enhanced stability of the traffic system. Furthermore, higher initial traffic density renders the traffic system more susceptible to congestion, resulting in local clustering effect and stop-and-go traffic phenomenon. Remarkably, the total energy consumption of the heterogeneous traffic system exhibits a gradual decline with increasing CAV permeability. Further evidence has demonstrated the positive impact of CAV on heterogeneous traffic flow. This research contributes to providing theoretical guidance for future CAV applications, aiming to enhance urban road traffic efficiency and alleviate congestion.","PeriodicalId":10253,"journal":{"name":"Chinese Physics B","volume":"29 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138589730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
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