Physics Letters A最新文献_第4页

Intrinsic nontrivial topology and van Hove singularities in superconductors YX2Si2 (X=Ni, Rh)

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-14 DOI: 10.1016/j.physleta.2025.130433

Yiting Wang, Yinxiang Li

{"title":"Intrinsic nontrivial topology and van Hove singularities in superconductors YX2Si2 (X=Ni, Rh)","authors":"Yiting Wang, Yinxiang Li","doi":"10.1016/j.physleta.2025.130433","DOIUrl":"10.1016/j.physleta.2025.130433","url":null,"abstract":"<div><div>Searching for nontrivial topology in superconductors is one of reasonable strategies to realize topological superconductor. Based on first-principles calculation, we have studied electronic structures and topological properties of ThCr<sub>2</sub>Si<sub>2</sub> type ternary superconductors YX<sub>2</sub>Si<sub>2</sub> (X=Ni, Rh) which have the same crystal structure as iron-based superconductors CaFe<sub>2</sub>As<sub>2</sub>. For material YNi<sub>2</sub>Si<sub>2</sub>, the topological Dirac cone locates below Fermi level 0.61 eV on (001) surface. By substituting Rh atoms for Ni atoms, the <span><math><msub><mrow><mi>d</mi></mrow><mrow><mi>x</mi><mi>y</mi></mrow></msub></math></span> orbital of transition metal atom Rh is lifted up above the Fermi level. This variation of band structure is responsible for topologically nontrivial surface states and van Hove singularities (vHs) in the vicinity of the Fermi level of superconductor YRh<sub>2</sub>Si<sub>2</sub>. The density of states (DOS) peak near Fermi level implies the existence of strong electron correlation which may induce unconventional superconductivity. The natural combination of topology and superconductivity in these materials provides us a new platform to discuss topological superconductor and mechanism of superconductor.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130433"},"PeriodicalIF":2.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642226","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

Nonlocal dispersion and intermediate layer effects in insulator-insulator-metal plasmonic waveguides

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-14 DOI: 10.1016/j.physleta.2025.130447

Wenkang Wang , Henglei Du , Chengpu Liu

引用次数: 0

Giant enhancement of third-harmonic generation in epsilon-near-zero material by an ITO-SiO2 metagrating

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-14 DOI: 10.1016/j.physleta.2025.130441

Shenwei Yin, Yi Liu, Yu Mao, Zhixiang Tang, Shuangchun Wen

{"title":"Giant enhancement of third-harmonic generation in epsilon-near-zero material by an ITO-SiO2 metagrating","authors":"Shenwei Yin, Yi Liu, Yu Mao, Zhixiang Tang, Shuangchun Wen","doi":"10.1016/j.physleta.2025.130441","DOIUrl":"10.1016/j.physleta.2025.130441","url":null,"abstract":"<div><div>Thin film of epsilon-near-zero (ENZ) materials always exhibit a maximum of nonlinear response under large-angle oblique illuminations. As a result, the parallel components are hardly helpful during the nonlinear processes. Here, we proposed a new approach for coupling all incident electric field into the ENZ nanostructures at the ENZ frequency. By fabricating ITO, a typical ENZ material, into a grating pattern and filling the gaps with SiO<sub>2</sub>, the incident light polarized in the direction of ITO-SiO<sub>2</sub> periodic arrangement were totally coupled into the nanostructure under normal incidence. Compared with a bare ITO film with same height at the ENZ wavelength, numerical simulations demonstrate a 10<sup>3</sup>-fold THG efficiency enhancement from the proposed ITO-SiO<sub>2</sub> metagrating under the pump intensity of <em>I</em><sub>0</sub>=1.2GW/cm<sup>2</sup>. For better understanding the giant enhanced nonlinear effects, field distributions at ENZ frequency in the metagrating were analyzed. In addition, the angle-dependent THG efficiencies of the proposed metagrating were also investigated.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130441"},"PeriodicalIF":2.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645056","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

Quantifying total correlations in quantum systems through the Pearson correlation coefficient

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-14 DOI: 10.1016/j.physleta.2025.130432

Spyros Tserkis , Syed M. Assad , Ping Koy Lam , Prineha Narang

引用次数: 0

Coulomb drag study of dynamic screening in graphene inhomogeneous bilayer system

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-12 DOI: 10.1016/j.physleta.2025.130420

Sharad Kumar Upadhyay

{"title":"Coulomb drag study of dynamic screening in graphene inhomogeneous bilayer system","authors":"Sharad Kumar Upadhyay","doi":"10.1016/j.physleta.2025.130420","DOIUrl":"10.1016/j.physleta.2025.130420","url":null,"abstract":"<div><div>We study coulomb drag phenomena in doped-graphene based electron-electron (e-e) bilayer systems described by non-interacting massless Dirac fermions separated by an insulating layer. The non-zero frequency dependent dynamic screening is taken into account to include the correlations between the two layer using the random phase approximation (RPA) method for long-range and weak interaction limits. Analytically, the frequency-dependent/dynamic response function is presented at finite and non-finite temperatures to consider the dynamic screening. At low temperatures, drag resistivity shows an usual Fermi-liquid behavior. However, a marked improvement has been found in the predictions of the conventional static interaction. Zero-temperature dependent dynamic screening results show <span><math><mo>≥</mo><mn>20</mn><mtext>%</mtext></math></span> enhanced drag resistivity (<span><math><msub><mrow><mi>ρ</mi></mrow><mrow><mi>D</mi></mrow></msub></math></span>) compared to static. Similarly, the dynamic screening at finite temperature result in a significant enhancement and qualitative change than non-finite temperature. The structure concern to non-homogeneous dielectric medium (NHDM) is also studied to consider the screening effects of substrate and uppermost layer into account. The introduction of NHDM structure finds a marked improvement compared to homogeneous dielectric medium (HDM).</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130420"},"PeriodicalIF":2.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611565","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical force adjusts the bonding orientation with respect to the electrode to regulate electronic transport in single-molecule devices

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-12 DOI: 10.1016/j.physleta.2025.130431

Tong-Hui Zhou , Lin Long , Zhi-Qiang Fan

{"title":"Mechanical force adjusts the bonding orientation with respect to the electrode to regulate electronic transport in single-molecule devices","authors":"Tong-Hui Zhou , Lin Long , Zhi-Qiang Fan","doi":"10.1016/j.physleta.2025.130431","DOIUrl":"10.1016/j.physleta.2025.130431","url":null,"abstract":"<div><div>The paper studies the mechanical force adjusting the bonding orientation with respect to the molecule to regulate electronic transport in single-molecule devices by using first-principle calculations. We designed molecular junctions by connecting tetraphenylene molecules to gold electrodes via amino or pyridine anchoring groups. By applying horizontal compressive force, the bonding orientation angle was adjusted from 0° to 45°, and the corresponding current-voltage characteristics were calculated. For the single-molecule device connected to gold electrodes via amino group, the transmission spectra exhibited a pronounced leftward shift as the orientation angle increased, accompanied by a gradual rise in the current. In contrast, the single-molecule device connected to gold electrodes via pyridine group showed no significant shift in the transmission spectra under mechanical compression. When the orientation angle increases to 30° and 45°, significant negative differential resistance behaviors are observed in the molecular devices. Our research results provide an understanding of the influence of bonding orientation on the electronic transport properties in molecular devices, and offering an approach to the realization of molecular functional devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130431"},"PeriodicalIF":2.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642225","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

High-performance achromatic metalens in the long-wavelength infrared regime

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-11 DOI: 10.1016/j.physleta.2025.130430

Tianqi Gu , Yihao Zhang , Hangbin Cai , Dawei Tang

{"title":"High-performance achromatic metalens in the long-wavelength infrared regime","authors":"Tianqi Gu , Yihao Zhang , Hangbin Cai , Dawei Tang","doi":"10.1016/j.physleta.2025.130430","DOIUrl":"10.1016/j.physleta.2025.130430","url":null,"abstract":"<div><div>In recent decades, metasurfaces have shown remarkable advancements in the development of integrated and miniaturized optical devices. Among these, metalenses have emerged as a prominent and significant area of research. In this paper, a broadband achromatic metalens is designed to operate across a wide wavelength range, specifically from 9.6 μm to 11.6 μm. To efficiently achieve the optimization of initial metalens parameters, we employ an envelope-based layering strategy that divides the sample space into multiple adjacent floors. This approach effectively reduces the loss rate and computational burden in a comprehensive manner. An enhanced Archimedes optimization algorithm is utilized to obtain the optimal solution. It incorporates the opposition-based learning with Sine map and elite retention strategy to enhance the search capability and avoid getting trapped in local optima. Following the optimization process, the proposed metalens achieves an average focusing efficiency of 53.64 %, with chromatic aberration correction accomplished at a coefficient of variation of only 2.27 %. This accomplishment signifies a substantial advancement in the field of achromatic metalenses.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130430"},"PeriodicalIF":2.3,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642224","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

Stable divergence angle control of OAM vortex beams with different modes

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-10 DOI: 10.1016/j.physleta.2025.130428

Wanglong Zhao, Shixing Yu, Na Kou

{"title":"Stable divergence angle control of OAM vortex beams with different modes","authors":"Wanglong Zhao, Shixing Yu, Na Kou","doi":"10.1016/j.physleta.2025.130428","DOIUrl":"10.1016/j.physleta.2025.130428","url":null,"abstract":"<div><div>In this letter, we propose a stable divergence angle control method for orbital angular momentum (OAM) beams with different modes. Typically, OAM beams with different mode numbers exhibit distinct divergence angles even under the same antenna aperture. This greatly limits its long-distance communication capability since receiving the OAM beams of different modes with varying divergence angle is difficult when the receiving antenna is usually fixed. Based on the directivity function of OAM beam generated by the uniform concentric circular array (UCCA), local extremum value can be found at the divergence angle. Hence, we can calculate the derivative of directivity functions to obtain the required excitation amplitude distribution. By changing the excitation amplitude of each ring in the UCCA without adjustment of the antenna aperture, the OAM beams with modes <em>l</em> = 1, 2 and 3 can reach the same divergence angle. Both simulated and measured results verify the correctness of the proposed method and it can provide references for applying OAM waves to the practical long-distance wireless communication systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"541 ","pages":"Article 130428"},"PeriodicalIF":2.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143609398","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

Interaction imbalanced spin-orbit coupled quantum droplets

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-10 DOI: 10.1016/j.physleta.2025.130426

Sonali Gangwar , Rajamanickam Ravisankar , S.I. Mistakidis , Paulsamy Muruganandam , Pankaj Kumar Mishra

{"title":"Interaction imbalanced spin-orbit coupled quantum droplets","authors":"Sonali Gangwar , Rajamanickam Ravisankar , S.I. Mistakidis , Paulsamy Muruganandam , Pankaj Kumar Mishra","doi":"10.1016/j.physleta.2025.130426","DOIUrl":"10.1016/j.physleta.2025.130426","url":null,"abstract":"<div><div>We explore the ground states and quench dynamics of spin-orbit coupled (SOC) one-dimensional two-component quantum droplets featuring intracomponent interaction imbalance. A plethora of miscible ground state stripe and standard flat-top or Gaussian droplets is found depending on the interplay between the SOC wavenumber and interactions. Deformations among these states are accompanied by controllable spin population transfer. Upon considering a trap we identify a transition from a bound to a trapped gas many-body state, captured through a sign change of the chemical potential, which occurs at lower (larger) atom numbers for tighter traps (stronger interactions). The droplets breathing frequency is found to increase for larger intracomponent interaction ratio or reaches a maximum at SOC wavenumbers where the transition from non-modulated flat-top to stripe droplets exists. Dynamical droplet fragmentation occurs for abrupt changes of the Rabi-coupling, while large amplitude quenches of the SOC wavenumber trigger spin-demixed counterpropagating untrapped droplets or in-trap out-of-phase oscillating ones. Our results offer insights into controlled spin-mixing processes in droplets and the potential excitation of magnetic bound states, opening avenues for further research in this field.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"542 ","pages":"Article 130426"},"PeriodicalIF":2.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645054","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

On the Ehrenfest theorem and centroids of relativistic particles

IF 2.3 3区物理与天体物理

Physics Letters A Pub Date : 2025-03-10 DOI: 10.1016/j.physleta.2025.130425

Konstantin Y. Bliokh

引用次数: 0