Physica Scripta最新文献_第5页

Chirality transfer torque and transverse Chirality current in the Dirac/magnetic Weyl semimetal junction 狄拉克/磁性韦尔半金属结中的手性传递扭矩和横向手性电流

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad7547

Morteza Salehi

引用次数: 0

Transition to chaos in magnetized rotating Rayleigh-Bénard convection 磁化旋转瑞利-贝纳德对流向混沌的过渡

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad741e

Dalton N Oliveira, Roman Chertovskih, Erico L Rempel and Francis F Franco

引用次数: 0

Theory of size quantization in monolayers of transition metal dichalcogenides 过渡金属二卤化物单层尺寸量化理论

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad7546

V R Rasulov, R Ya Rasulov, M Kh Nasirov, I A Muminov and M M Mamatova

引用次数: 0

Time domain optimization of pair production during vacuum breakdown triggered by frequency chirped external fields 在频率啁啾外场触发的真空击穿过程中对生产的时域优化

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad7331

Chi Gong, Xinyu Lu, Dakai Shang, Zhi Ren and Songtao Li

引用次数: 0

Periodicity of bipartite walk on biregular graphs with conditional spectra 具有条件谱的双翼图上双翼行走的周期性

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad71ff

Qiuting Chen

引用次数: 0

Entanglement enhancement of two giant atoms with multiple connection points in bidirectional-chiral quantum waveguide-QED system 双向手性量子波导-QED 系统中具有多个连接点的两个巨原子的纠缠增强

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad75c0

Jie Liu, Yue Cai, Kang-Jie Ma, Lei Tan and Wu-Ming Liu

{"title":"Entanglement enhancement of two giant atoms with multiple connection points in bidirectional-chiral quantum waveguide-QED system","authors":"Jie Liu, Yue Cai, Kang-Jie Ma, Lei Tan and Wu-Ming Liu","doi":"10.1088/1402-4896/ad75c0","DOIUrl":"https://doi.org/10.1088/1402-4896/ad75c0","url":null,"abstract":"We study the entanglement generation of two giant atoms within a one-dimensional bidirectional-chiral waveguide quantum electrodynamics (QED) system, where the initial state of the two giant atoms are ∣ea, gb〉. Here, each giant atom is coupled to the waveguide through three connection points, with the configurations divided into five types based on the arrangement of coupling points between the giant atoms and the waveguide: separate, fully braided, partially braided, fully nested, and partially nested. We explore the entanglement generation process within each configuration in both nonchiral and chiral coupling cases. It is demonstrated that entanglement can be controlled as needed by either adjusting the phase shift or selecting different configurations. For nonchiral coupling, the entanglement of each configuration exhibits steady state properties attributable to the presence of dark state. In addition, we find that steady-state entanglement can be obtained at more phase shifts in certain configurations by increasing the number of coupling points between the giant atoms and the bidirectional waveguide. In the case of chiral coupling, the entanglement is maximally enhanced compared to the one of nonchiral case. Especially in fully braided configuration, the concurrence reaches its peak value 1, which is robust to chirality. We further show the influence of atomic initial states on the evolution of interatomic entanglement. Our scheme can be used for entanglement generation in chiral quantum networks of giant-atom waveguide-QED systems, with potential applications in quantum networks and quantum communications.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"52 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199519","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

Analytical study of the thermoelectric properties in silicene 硅的热电特性分析研究

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad7414

R Amarnath, K S Bhargavi and S S Kubakaddi

{"title":"Analytical study of the thermoelectric properties in silicene","authors":"R Amarnath, K S Bhargavi and S S Kubakaddi","doi":"10.1088/1402-4896/ad7414","DOIUrl":"https://doi.org/10.1088/1402-4896/ad7414","url":null,"abstract":"Theoretically, we investigate the thermoelectric (TE) properties namely, electrical conductivity (σ), diffusion thermopower (Sd), power factor (PF), electronic thermal conductivity (κe) and thermoelectric figure of merit (ZT) for silicene on Al2O3 substrate. TE coefficients are obtained by solving the Boltzmann transport equation taking account of the electron scattering by all the relevant scattering mechanisms in silicene, namely charged impurity (CI), short-range disorder (SD), intra- and inter-valley acoustic (APs) and optical (OPs) phonons, and surface optical phonons (SOPs). The TE properties are numerically studied as a function of temperature T (2–400K) and electron concentration ns(0.1–10 × 1012 cm−2). The calculated σ and Sdare found to be governed by CIs at low temperatures (T< ∼ 10 K), similar to that in graphene. At higher T, they are found to be mainly dominated by the intra- and inter-valley APs. The resultant σ (Sd) is found to decrease (increase) with increasing T, whereas PF remains nearly constant for T> ∼ 100 K. On the other hand, ns dependence shows that σ (Sd) increases (decreases) with increasing ns; with PF relatively constant at lower ns and then decreases with increasing ns. At room temperature, the calculated σ (Sd) in silicene is closer to that in graphene and about an order of magnitude greater (less) than that in monolayer (ML) MoS2. The κe is found to be weakly depending on T and Wiedemann–Franz law is shown to be violated. We have predicted a maximum PF ∼3.5 mW m−1 K−2, at 300 K for ns = 0.1 × 1012 cm−2 from which the estimated ZT = 0.11, taking a theoretically predicted lattice thermal conductivity κl = 9.4 Wm−1 K−1, is a maximum. This ZT is much greater than that of graphene and ML MoS2. The ZT is found to decrease with the increasing ns. The ZT values for other values of ns in silicene, at 300 K, also show much superiority over graphene, thus making silicene a preferred thermoelectric material because of its relatively large σ and very small κl.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"3 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199516","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

A novel design of energy absorption branch for HVDC circuit breakers 高压直流断路器能量吸收支路的新型设计

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad75c3

Guoqiang Gao, Bingyan You, Yaguang Ma, Aozheng Wang, Wei Peng, Pengyu Qian, Yu Xiang, Zefeng Yang, Wenfu Wei and Guangning Wu

{"title":"A novel design of energy absorption branch for HVDC circuit breakers","authors":"Guoqiang Gao, Bingyan You, Yaguang Ma, Aozheng Wang, Wei Peng, Pengyu Qian, Yu Xiang, Zefeng Yang, Wenfu Wei and Guangning Wu","doi":"10.1088/1402-4896/ad75c3","DOIUrl":"https://doi.org/10.1088/1402-4896/ad75c3","url":null,"abstract":"Metal oxide varistors (MOV) used for energy absorption branch in DC circuit breakers are complex enough to meet the requirements for small volume, light weight, and reliability in future high-voltage direct current (HVDC) grids. Therefore, a new energy absorption branch circuit that combines MOV and a liquid metal alloy energy absorber (LMEA) is proposed. Based on the constructed equivalent mathematical model of LMEA, the working principle and energy absorption process of MOV and LMEA in DC breaking process are analysed in PSCAD/EMTDC simulation software. Results demonstrate that LMEA, in contrast to MOV alone, absorbs 2.12 MJ of energy, constituting 35.6% of the total energy. Moreover, LMEA enhances energy dissipation density while reducing volume. Experimental analysis reveals MOV’s energy absorption mechanism via achieving residual voltage with ZnO varistor’s non-linear properties, swiftly transitioning from high to low resistance states to absorb energy. Conversely, LMEA relies on pulse current amplitude to initiate internal arcing, sharply increasing internal resistance for effective energy absorption. Experimental findings validate LMEA’s contribution of one-third of total energy absorption when pulse current amplitude reaches critical arcing threshold, consistent with simulation results. The results provide theoretical support for the engineering application of the new liquid metal alloy energy absorption in DC circuit breakers.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"15 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199520","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

Dynamics of memristive circuit driven by Josephson junction 约瑟夫森结驱动的记忆电路动力学

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad7650

Cuimei Jiang, Xuejing Gu, Fangfang Zhang, Jian Liu and Pengfei Liu

引用次数: 0

A room-temperature ultrafast carrier dynamical study and thickness-dependent investigation of WTe2 thin films on a flexible PET substrate 柔性 PET 基底上的 WTe2 薄膜的室温超快载流子动力学研究和厚度依赖性调查

IF 2.9 3区物理与天体物理

Physica Scripta Pub Date : 2024-09-12 DOI: 10.1088/1402-4896/ad75d3

Sahil Verma, Kapil Kumar, Reena Yadav, Animesh Pandey, Mandeep Kaur, Mahesh Kumar and Sudhir Husale

{"title":"A room-temperature ultrafast carrier dynamical study and thickness-dependent investigation of WTe2 thin films on a flexible PET substrate","authors":"Sahil Verma, Kapil Kumar, Reena Yadav, Animesh Pandey, Mandeep Kaur, Mahesh Kumar and Sudhir Husale","doi":"10.1088/1402-4896/ad75d3","DOIUrl":"https://doi.org/10.1088/1402-4896/ad75d3","url":null,"abstract":"In the current era of increasing demand for optoelectronic-based devices with ultra-rapid response, it is important to understand the processes associated with the relaxation dynamics of hot carriers and transient electrical properties of WTe2 material under photoexcitation of charge carriers. In this work, using femtosecond laser pump–probe spectroscopy at room temperature we performed the transient absorption measurement on sputtered deposited WTe2 thin films having four different thicknesses to study dynamics associated with the relaxation of their hot carriers. The relaxation dynamics of photoexcited charge carriers undergo three exponential decay components associated with electron–phonon thermalization in the conduction band and phonon-assisted electron–hole recombination between the electron and hole pocket. The thickness-dependent investigation of WTe2 thin films reveals that the electron–hole recombination process is more prominent in thicker films than in thinner films, supporting previously published theoretical and experimental conclusions. The Ultrafast study of WTe2 thin films suggests that it is a suitable material for future ultrafast optoelectronic-based device applications.","PeriodicalId":20067,"journal":{"name":"Physica Scripta","volume":"10 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199522","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