Physics Letters A最新文献_第6页

From free-evolution to symplectic quantum tomographic representation 从自由演化到辛量子层析表示

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-17 DOI: 10.1016/j.physleta.2026.131381

S. Cordero , R. López-Peña , E. Nahmad-Achar , O. Castaños , J.A. López-Saldívar , V.I. Man’ko

引用次数: 0

Optimizing the transmission performance of magnetoelectric antennas through machine learning algorithms 利用机器学习算法优化磁电天线的传输性能

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-19 DOI: 10.1016/j.physleta.2026.131385

Yang Shi , Naijun Zhao , Deqiang Meng

{"title":"Optimizing the transmission performance of magnetoelectric antennas through machine learning algorithms","authors":"Yang Shi , Naijun Zhao , Deqiang Meng","doi":"10.1016/j.physleta.2026.131385","DOIUrl":"10.1016/j.physleta.2026.131385","url":null,"abstract":"<div><div>Current research on magnetoelectric (ME) antennas relies on experiments, simulations, and analytics, but lacks systematic ways to efficiently find optimal designs. This study addresses these gaps by developing a multi-field coupling model for ME antennas that includes the magnetic layer’s nonlinearity and electrode effects. Based on the model’s data, a machine learning model was developed to identifing the optimal parameters for maximizing the converse ME (CME) effect. The results demonstrate that under the combined pre-stress and bias magnetic field, the ME antenna exhibits significant nonlinear magneto-elastic coupling. The magnetic layer’s volume fraction and its equivalent parameters have considerable influence on both the CME coefficient and the resonant frequency. Feature importance analysis highlighted “frequency”, “electrode material”, “volume fraction”, and “bias magnetic field” as the most critical parameters for the CME effect, while variations in “saturation stress” have the least impact. The optimal CME coefficient of the studied antenna reaches 51.28 G/V.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131385"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026230","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

Coexistence of superconductivity and charge density wave in a correlated regime 超导性与电荷密度波在相关区共存

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-16 DOI: 10.1016/j.physleta.2026.131380

E.J. Calegari , L.C. Prauchner , A.C. Lausmann , S.G. Magalhaes

引用次数: 0

Eight-port SRR-shaped MIMO antenna design for terahertz UWB applications in 6G and biomedical domains 八端口srr形MIMO天线设计，用于6G和生物医学领域的太赫兹UWB应用

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-18 DOI: 10.1016/j.physleta.2026.131384

Sunil Lavadiya , Vipul M Dabhi , Vishal Sorathiya , Gude Narendra , Abdullah G. Alharbi

{"title":"Eight-port SRR-shaped MIMO antenna design for terahertz UWB applications in 6G and biomedical domains","authors":"Sunil Lavadiya , Vipul M Dabhi , Vishal Sorathiya , Gude Narendra , Abdullah G. Alharbi","doi":"10.1016/j.physleta.2026.131384","DOIUrl":"10.1016/j.physleta.2026.131384","url":null,"abstract":"<div><div>This research paper proposes a novel and high-performance eight-port ring-shaped MIMO antenna for THz applications. High-performance parameters are obtained using the antenna designed on RT Duroid substrate. The antenna includes a modified substrate geometry with a conductive ring element and a ground plane. By arranging the elements orthogonally, polarisation diversity and isolation are achieved in a plus-shaped configuration. This proposed antenna is found to have an average gain > 4.5 dB, an omnidirectional radiation pattern, peak isolation > 50dB, and an Envelope Correlation Coefficient (ECC) < 0.015, making it ideal for portable THz applications. The eight-port antenna remains compact, measuring 80 × 142 µm² at the lowest operating frequency. The high isolation and low profile make the proposed design unique. The high diversity performance proves the proposed design is a strong candidate for an MIMO antenna. The proposed design is a strong candidate for the spectroscopy, biomedical and 6G communication-related services.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131384"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026235","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

Study of squeezing and entanglement dynamics in a non-resonant three-level atom–optomechanical hybrid system 非共振三能级原子-光机混合系统的压缩和纠缠动力学研究

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-15 DOI: 10.1016/j.physleta.2026.131370

Miguel A. Medina-Armendariz , Rubab Shabir , Guo-Hua Sun , Shi-Hai Dong

引用次数: 0

Monostatic RCS analysis of a microwave absorber using Halvorsen chaotic technique and resistive ink 利用Halvorsen混沌技术和电阻墨水对微波吸收器进行单稳态RCS分析

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-26 DOI: 10.1016/j.physleta.2026.131420

Olcay Altıntaş , Halil Paşalıoğlu

引用次数: 0

Electric field effect on the electronic properties of pyramidal core/shell/shell quantum dots under a Konwent-like potential 类konwent电位下电场对金字塔形核/壳/壳量子点电子特性的影响

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-11 DOI: 10.1016/j.physleta.2026.131362

O. Ben Hammou , A. Fakkahi , J. El-Hamouchi , A. Ed-Dahmouny , H. Azmi , M. Jaafar , S. El Otmani , R. Touti , F. Demami , A. Sali

{"title":"Electric field effect on the electronic properties of pyramidal core/shell/shell quantum dots under a Konwent-like potential","authors":"O. Ben Hammou , A. Fakkahi , J. El-Hamouchi , A. Ed-Dahmouny , H. Azmi , M. Jaafar , S. El Otmani , R. Touti , F. Demami , A. Sali","doi":"10.1016/j.physleta.2026.131362","DOIUrl":"10.1016/j.physleta.2026.131362","url":null,"abstract":"<div><div>This work presents a detailed investigation of the binding energy of a donor impurity located at the center of pyramidal core/shell/shell quantum dots under a Konwent-like confinement potential. Using the effective mass approximation and the finite element method, the study analyzes the effects of confinement parameters, structural dimensions, and an external electric field, as well as polaronic mass enhancement and conduction band non-parabolicity. The results reveal that the impurity binding energy is strongly influenced by both the geometric dimensions and the characteristics of the confinement potential. Moreover, the presence of an external electric field induces a significant modification of the donor energy levels, reflecting the field-induced spatial redistribution of the electron wavefunction. Additionally, the inclusion of polaronic effects and band non-parabolicity leads to a notable enhancement of the binding energy, particularly under strong confinement, emphasizing their crucial role in accurately describing the electronic properties of such nanostructures.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131362"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981955","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

Optimizing ZnFe2O4/NiO nanoheterostructures for exchange bias ZnFe2O4/NiO纳米异质结构的交换偏压优化

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-09 DOI: 10.1016/j.physleta.2026.131353

Nitesh Singh , Moisés Gilberto Zarzoza Medina , Banasree Sadhukhan , Anil Annadi , Panagiotis Grammatikopoulos , Hsiung Chou , Murtaza Bohra

{"title":"Optimizing ZnFe2O4/NiO nanoheterostructures for exchange bias","authors":"Nitesh Singh , Moisés Gilberto Zarzoza Medina , Banasree Sadhukhan , Anil Annadi , Panagiotis Grammatikopoulos , Hsiung Chou , Murtaza Bohra","doi":"10.1016/j.physleta.2026.131353","DOIUrl":"10.1016/j.physleta.2026.131353","url":null,"abstract":"<div><div>Assembling materials with distinct magnetic characteristics in antiferromagnetic/ferrimagnetic (AFM/FiM) heterostructures enables emergent magnetic functionalities. In this study, we elucidate the individual roles of the AFM and FiM layers in exchange-coupled NiO/ZnFe<sub>2</sub>O<sub>4</sub> bilayers by varying the NiO thickness (150–750 nm) and reversing the stacking order. For NiO/ZnFe<sub>2</sub>O<sub>4</sub> bilayers with a fixed ZnFe<sub>2</sub>O<sub>4</sub> thickness, structural analysis shows mixed (111) and (100) textured growth of NiO accompanied by significant interfacial intermixing. In contrast, inverted ZnFe<sub>2</sub>O<sub>4</sub>/NiO bilayers exhibit a sharper interface and predominantly (100) textured NiO growth. These structural distinctions strongly influence the magnetic response: NiO/ZnFe<sub>2</sub>O<sub>4</sub> bilayers display a larger exchange bias (<em>H</em><sub>EB</sub> ≈ 1.2 kOe at 5 K) that increases exponentially with NiO thickness, whereas weaker biasing is observed in the inverted configuration. Coarse-grained micromagnetic simulations reproduce the hysteresis-loop shift and reveal interfacial exchange frustration. Overall, these results provide insights relevant to the design of oxide-based spintronic devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131353"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039607","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

Bloch oscillations of helicoidal spin-orbit coupled Bose-Einstein condensates in deep optical lattices 深光学晶格中螺旋自旋-轨道耦合玻色-爱因斯坦凝聚体的布洛赫振荡

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-09 DOI: 10.1016/j.physleta.2026.131342

Sumaita Sultana, Golam Ali Sekh

引用次数: 0

The stability of band flattening effect against In/Se vacancy in antiferroelectric α-In2Se3 bilayer moiré superlattice 反铁电α-In2Se3双层moirir超晶格中In/Se空位带展平效应的稳定性

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-03-28 Epub Date: 2026-01-14 DOI: 10.1016/j.physleta.2026.131373

Chuanfu Li , Haoxuan Li , Zhenjie Su , Honggang Zhang , Ping Wang , Liufang Chen , Yangshun Lan , Chunfeng Dong

{"title":"The stability of band flattening effect against In/Se vacancy in antiferroelectric α-In2Se3 bilayer moiré superlattice","authors":"Chuanfu Li , Haoxuan Li , Zhenjie Su , Honggang Zhang , Ping Wang , Liufang Chen , Yangshun Lan , Chunfeng Dong","doi":"10.1016/j.physleta.2026.131373","DOIUrl":"10.1016/j.physleta.2026.131373","url":null,"abstract":"<div><div>One key characteristic of an intriguing moiré superlattice formed by interlayer-twisted bilayer material is the emergence of low-energy ultra-flat bands. The stability of such band flattening effect should be evaluated for practical applications. An interlayer-twisted α-In<sub>2</sub>Se<sub>3</sub> bilayer with end-to-end antiferroelectric polarization (AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice) exhibits ultra-flat top valence band that is insensitive to the moiré period due to strong localization of electronic states near the interlayer interfaces. Here, we investigate the stability of the band flattening effect in AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice against In/Se vacancies, using a simple defect model based on first-principles calculations. The results reveal that the band flattening effect remains robust, although vacancies modulate the electronic states. This robustness primarily originates from negative charges localized near the interlayer interfaces, emphasizing the key role of interface-localized electronic states in sustaining band flattening effect and demonstrating the potential of such band flattening effect in AFE-1-α-In<sub>2</sub>Se<sub>3</sub> moiré superlattice for practical applications.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131373"},"PeriodicalIF":2.6,"publicationDate":"2026-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981956","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