Physics Letters A最新文献_第5页

Ab-initio study of structural, electronic, mechanical, and thermoelectric properties of Sr2ZnN2 Sr2ZnN2结构、电子、机械和热电性能的从头算研究

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.2026.131374

Bandari Rashmi , Srivani Javvaji , S. Shravan Kumar Reddy , P. Rambabu , Srinivasa Rao Pathipati

{"title":"Ab-initio study of structural, electronic, mechanical, and thermoelectric properties of Sr2ZnN2","authors":"Bandari Rashmi , Srivani Javvaji , S. Shravan Kumar Reddy , P. Rambabu , Srinivasa Rao Pathipati","doi":"10.1016/j.physleta.2026.131374","DOIUrl":"10.1016/j.physleta.2026.131374","url":null,"abstract":"<div><div>We present a comprehensive study of the structural, electronic, mechanical, and thermoelectric properties of the ternary nitride compound Sr<sub>2</sub>ZnN<sub>2</sub> using first-principles density functional theory (DFT) combined with semi-classical Boltzmann transport theory. The compound is found to be dynamically and mechanically stable, as confirmed by phonon dispersion and elastic constant calculations satisfying the Born–Huang criteria. The electronic structure, computed using the modified Becke–Johnson (mBJ) potential, reveals a direct bandgap of 1.574 eV. Mechanical analysis indicates ductile behavior, supported by positive Cauchy pressure, Poisson’s ratio, and Pugh’s ratio. Thermal transport analysis shows that acoustic phonon scattering is the dominant scattering mechanism affecting charge carrier mobility, while ionized impurity and polar optical phonon scattering contribute minimally. The lattice thermal conductivity, estimated using Slack’s approximation, decreases with increasing temperature, supporting its potential for thermoelectric applications. These findings highlight Sr<sub>2</sub>ZnN<sub>2</sub> as a mechanically robust and electronically promising material with potential for moderate thermoelectric performance.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131374"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026231","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

Ultrafast response of graphene to intense single-cycle ultrashort light pulses 石墨烯对强单周期超短光脉冲的超快响应

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.2026.131390

Xiangru Kong, Erjun Zhao

{"title":"Ultrafast response of graphene to intense single-cycle ultrashort light pulses","authors":"Xiangru Kong, Erjun Zhao","doi":"10.1016/j.physleta.2026.131390","DOIUrl":"10.1016/j.physleta.2026.131390","url":null,"abstract":"<div><div>The ultrafast light-graphene interactions under attosecond and femtosecond pulses both from dynamics of electron motion and light propagation are investigated by first-principles approach combined with a multiscale procedure. The calculated results indicate that the low photon number density of each frequency contained in attosecond pulses renders the propagation and energy deposition in graphene insensitive to a wide intensity range. The broad spectral bandwidth of attosecond pulses enable electrons to simultaneously absorb two photons of different frequencies, producing quantum interference effects and achieving maximum energy transfer at 0.38 fs through resonance phase matching between current density and electric field. The carrier-envelope phase (CEP) can generate net charge accumulation in graphene with the sign of acculated charge along the polarization direction. This CEP-controlled charge pattern provides a means of encoding information that exceeds the spatiotemporal resolution limits achievable with conventional femtosecond pulse control. These findings lay the groundwork for ultrafast signal-processing architectures.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131390"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026237","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

Transverse electric waves in Bandos-Lechner-Sorokin-Townsend nonlinear electrodynamics Bandos-Lechner-Sorokin-Townsend非线性电动力学中的横波

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.2026.131375

Yang Shi , Qinyan Tan , Towe Wang

引用次数: 0

Coherence freezing and tunable decoherence-free/uniformly-decaying subspaces in collectively decaying qutrits 集体衰变量子中的相干冻结和可调无退相干/均匀衰减子空间

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-08 DOI: 10.1016/j.physleta.2026.131348

R. Sufiani, Sajjad Saei

{"title":"Coherence freezing and tunable decoherence-free/uniformly-decaying subspaces in collectively decaying qutrits","authors":"R. Sufiani, Sajjad Saei","doi":"10.1016/j.physleta.2026.131348","DOIUrl":"10.1016/j.physleta.2026.131348","url":null,"abstract":"<div><div>Quantum coherence in collectively decaying V-type qutrit ensembles exhibits long-lived plateaus at zero temperature due to symmetry-protected dark sectors. Using the analytically solved reduced dynamics of the symmetric single-excitation block as a fixed baseline, we develop a coherence-centric framework that evaluates the ℓ<sub>1</sub> norm and relative-entropy coherence in closed form on the single-site marginal, surveys parameter dependence, and compares representative initial states. We then extend the baseline to finite temperature and non-Markovian environments using exponential-memory kernels via a pseudomode (Markovian) embedding and time-local TCL forms. In balanced-decay regimes these models display coherence revivals and late-time plateaus that exceed the Markovian zero-temperature value; BLP backflow and RHP CP-indivisibility diagnostics corroborate information return. Next, we introduce tunable protection by steering between bright and dark modes with weak, permutation-invariant controls, enabling rapid population transfer into a decoherence-free subspace (DFS). We further formalize uniformly decaying subspaces (UDS), propose a simple rate-balance indicator that predicts plateau robustness, and show how both DFS and UDS extend naturally to multibranch qudits (<em>d</em> > 3), where the protected sector grows and strengthens plateaus. Throughout, the coherence functionals remain unchanged while only the time laws of reduced coefficients are upgraded, yielding a compact, reproducible methodology for analyzing and designing noise-resilient multilevel platforms.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131348"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026057","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

Crystallographic exploration of copper nanocrystal by X-ray and selected area electron diffraction pattern: High resolution transmission electron microscopy insight 用x射线和选定区域电子衍射图对铜纳米晶体的晶体学探索：高分辨率透射电子显微镜的见解

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-20 DOI: 10.1016/j.physleta.2026.131391

Md. Ashraful Alam, Raton Kumar Bishwas, Fariha Zannat, Shirin Akter Jahan

{"title":"Crystallographic exploration of copper nanocrystal by X-ray and selected area electron diffraction pattern: High resolution transmission electron microscopy insight","authors":"Md. Ashraful Alam, Raton Kumar Bishwas, Fariha Zannat, Shirin Akter Jahan","doi":"10.1016/j.physleta.2026.131391","DOIUrl":"10.1016/j.physleta.2026.131391","url":null,"abstract":"<div><div>Highly crystalline copper nanoparticles (Cu NPs) were characterized by X-ray diffraction (XRD), showing prominent diffraction peaks at 2θ= 43.4331 (111), 50.5531 (200) and 74.2090º (220) consistent with a face-centered cubic (FCC) crystal structure. Rietveld refinement yielded lattice parameters a=b=c= 3.612 Å; α=β=γ= 90.00 °, lattice volume 47.142 Å³ and strain 0.137 % with excellent pattern fitting [Rwp, % 9.19; Rp, % 6.47; S, 1.4007; χ², 1.9604]. Optical analysis showed a maximum absorbance at 338.30 nm and a bandgap of 4.33 eV, reflecting a blue shift and strong surface plasmon resonance. Dynamic light scattering (DLS) and zeta potential (72.74 mV) confirmed uniform colloidal dispersion and high stability. Transmission electron microscopy (TEM) and HR-TEM analyses revealed particle size of 39 to 48 nm, uniform growth and d <sub>(111)</sub> spacing of 0.208 nm and 0.180 nm for d <sub>(200)</sub> while selected area electron diffraction (SAED) patterns and energy dispersive spectroscopy (EDS) confirmed highly pure FCC Cu crystal up to 89.20 %. The vibrating sample magnetometer (VSM) revealed remnant mass magnetization of 0.000988991327703507 emu/g, indicating weak magnetic behavior. These structural, morphological and optical features highlight the potential of Cu NPs for applications in antimicrobial coatings, sensing and catalysis while further investigations are required to evaluate their biocompatibility and performance under real-world conditions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131391"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026228","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

Atomic impurity in a quasi-one-dimensional dipolar Bose-Einstein condensate 准一维偶极玻色-爱因斯坦凝聚中的原子杂质

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.2026.131376

B. Kh. Turmanov , F. Kh. Abdullaev , F.Z. Isakov

引用次数: 0

Bimodal phase transition in a periodically modulated Λ-type three-level system 周期性调制Λ-type三能级系统中的双峰相变

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-20 DOI: 10.1016/j.physleta.2026.131386

Sanjoy Mishra , Shraddha Sharma , Amit Rai , Pitamber Mahanandia

{"title":"Bimodal phase transition in a periodically modulated Λ-type three-level system","authors":"Sanjoy Mishra , Shraddha Sharma , Amit Rai , Pitamber Mahanandia","doi":"10.1016/j.physleta.2026.131386","DOIUrl":"10.1016/j.physleta.2026.131386","url":null,"abstract":"<div><div>We present a theoretical investigation of dynamical quantum phase transitions (QPTs) in a periodically driven Λ-type three-level system (3LS) embedded in a double-mode cavity, described by a three-level Jaynes-Cumming (3L-JC) Hamiltonian. To begin with, we probe the undriven static Hamiltonian in the dressed-state basis to identify and define distinct coupling regimes and critical points associated with both cavity modes. Furthermore, to investigate the dynamical QPTs in this system, we incorporate a periodic modulation across two atomic states (denoted by |3⟩<sub><em>at</em></sub> and |2⟩<sub><em>at</em></sub>) out of the three available energy levels. By performing necessary transformations and approximations, we reduce the overall Hamiltonian, which contains static and dynamic modulation terms, into an effective 3L-JC Hamiltonian whose system parameters are dependent on the driving parameters. The validity of our approximations is verified using the Loschmidt echo of time-evolved states corresponding to Hamiltonians before and after the approximations. Finally, we demonstrate that by tuning the modulation parameters, it is possible to explore bimodal superradiant phases in a three-level Λ-type system while remaining within the critical coupling limits of the static Hamiltonian. Our results provide an insight into the manipulation of quantum phases in a three-level system within an effective extended Jaynes-Cummings regime.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131386"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146080613","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

Dual-narrowband terahertz absorber with independently tunable amplitude and frequency: A theoretical study 幅频可调双窄带太赫兹吸收器的理论研究

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-21 DOI: 10.1016/j.physleta.2026.131395

Hao Fu, Fang Chen

{"title":"Dual-narrowband terahertz absorber with independently tunable amplitude and frequency: A theoretical study","authors":"Hao Fu, Fang Chen","doi":"10.1016/j.physleta.2026.131395","DOIUrl":"10.1016/j.physleta.2026.131395","url":null,"abstract":"<div><div>A hybrid molybdenum disulfide (<em>MoS</em><sub>2</sub>) and strontium titanate (STO) metamaterial absorber is presented for the terahertz band, enabling dynamic tuning of absorption properties via both electrical and thermal stimuli. The absorber features a multilayer architecture comprising a gold substrate, a <em>SiO</em><sub>2</sub> dielectric spacer, an elliptical cross_shaped <em>MoS</em><sub>2</sub> resonant layer, and an STO thin film. It achieves dual narrowband perfect absorption at 0.25 THz and 1.30 THz, with absorptances of 99.09 % and 99.72 %, respectively. Research findings indicate that the absorptance of the first absorption peak can be independently modulated by adjusting the carrier concentration of <em>MoS</em><sub>2</sub>. As the carrier concentration increases from 1 × 10<sup>13</sup> <em>cm</em><sup>-2</sup> to 1 × 10<sup>15</sup> <em>cm</em><sup>-2</sup>, the absorptance rises from 62.33 % to 99.09 %, yielding a modulation depth of 37.09 %. Independent tuning of the resonance frequencies is achieved by adjusting temperature: heating from 250 K to 500 K induces a blue shift of the absorption spectrum, with temperature sensitivities of 0.43 GHz/K and 2.24 GHz/K for the two peaks, respectively. The absorption spectra obtained through coupled mode theory (CMT) and the equivalent circuit model (ECM) exhibit excellent agreement with the simulation results. Electromagnetic field and current distributions elucidate the independent tuning mechanism of the absorber. Additionally, the absorber demonstrates polarization-insensitive characteristics and wide-angle incidence stability, showing promising application prospects in fields such as biochemical sensing, optical switching, and modulation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131395"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026229","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

η -pairing in the model with two-particle hybridization of conduction and localized electrons 具有传导电子和定域电子两粒子杂化模型的η -配对

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.2026.131379

Igor N. Karnaukhov

引用次数: 0

Artificial intelligence-assisted modeling of geometrical effects on the optoelectronic properties of concentric and non-concentric CdSe/CdS core-shell quantum dots 同心和非同心CdSe/CdS核壳量子点光电特性几何影响的人工智能辅助建模

IF 2.6 3区物理与天体物理

Physics Letters A Pub Date : 2026-04-05 Epub Date: 2026-01-10 DOI: 10.1016/j.physleta.2026.131354

Safa Maamria , Ibrahim Khalil Chiba , Adel Bouazra , Moncef Said

引用次数: 0