Physics Letters A最新文献

{"title":"Influence of strong dot-lead couplings on the Majorana leakage effect","authors":"Cong Wang ,&nbsp;Zong-Gang Xu ,&nbsp;Xiao Qi Wang","doi":"10.1016/j.physleta.2024.130149","DOIUrl":"10.1016/j.physleta.2024.130149","url":null,"abstract":"<div><div>By means of the scattering matrix and non-equilibrium Green function technique, the influence of dot-lead coupling on the Majorana leakage effect is theoretically studied. By calculating the conductance spectra and the local density of states, we find the conductance peaks coincide with the eigenlevels of the Majorana-dot hybrid system when the dot-lead coupling is relatively weak. With the increase of the dot-lead coupling, the Majorana leakage effect is manifested as the formation of one wide conductance peak at the zero-bias limit, whose widening is inversely proportional to the dot-lead coupling strength. When the left-right asymmetry is enhanced by strengthening the dot-lead coupling, the Majorana leakage effect shows the improvement of the zero-bias conductance peak. In the presence of superconducting proximity effect, the Majorana leakage effect is further modified in the case of left-right asymmetry of the dot-lead coupling. We believe that these results are helpful in further understanding the transport properties of the Majorana-dot hybrid systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130149"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149229","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}

{"title":"Sensitivity analysis and dynamics of optical dromions in conformable generalized nonlinear Schrödinger systems","authors":"Shafqat Ur Rehman ,&nbsp;Muhammad Bilal ,&nbsp;Jingli Ren ,&nbsp;Mustafa Bayram ,&nbsp;Mustafa Inc","doi":"10.1016/j.physleta.2024.130168","DOIUrl":"10.1016/j.physleta.2024.130168","url":null,"abstract":"<div><div>In this research, we explore the intricate dynamics of soliton solutions within optical communication systems, a domain critical for modern telecommunications. Employing an innovative new extended direct algebraic approach, we unveil a fresh set of optical solitons and other solutions tailored to govern (2+1)-dimensional nonlinear dynamically adaptive fractional generalized Schrödinger systems. These systems form the foundational framework for understanding the propagation of solitary waves in the complex form of optical communication networks. Our investigation yields a diverse spectrum of optical soliton solutions, ranging from the classic dark and bright solitons to more complex forms such as dark-bright combinations, periodic structures, and singular wave solutions. These solutions, characterized by hyperbolic and trigonometric functions, represent various physical phenomena that manifest in optical fibers under different conditions. To ensure the validity and accuracy of our results, we rigorously verify our derived solutions using mathematical tools, particularly leveraging the capabilities of Mathematica. This validation process underscores the robustness and reliability of our findings, instilling confidence in their applicability to real-world optical systems. To provide a comprehensive understanding of the physical properties of these soliton solutions, we employ visual representations such as 2D and 3D plots, contour maps, and density graphs. These graphical depictions offer insights into the behavior, stability, and propagation characteristics of the solitons, enriching our comprehension of nonlinear dynamics in optical communication systems. Moreover, the sensitivity analysis of the problem is also analyzed. Ultimately, our study not only advances the theoretical understanding of soliton dynamics but also lays the groundwork for practical applications in the design and optimization of optical communication networks. By elucidating various soliton phenomena encountered in mathematical physics and engineering, our research opens new avenues for exploration and innovation in this critical field.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130168"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149632","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}

{"title":"Robust dynamics of rogue waves, breathers and mixed bound state solutions in spin-orbit and Rabi coupled condensates","authors":"P.S. Vinayagam ,&nbsp;R. Radha","doi":"10.1016/j.physleta.2024.130169","DOIUrl":"10.1016/j.physleta.2024.130169","url":null,"abstract":"<div><div>In this paper, based on an integrable model governed by four system parameters, namely, spin-orbit coupling and Rabi coupling which are constants while the other two parameters, namely the harmonic trap and scattering lengths which are time dependent, we investigate the spin orbit-Rabi coupled condensates governed by the two coupled Gross-Pitaevskii(GP) equation. Employing Darboux transformation approach with nontrivial seed solution, we generate rogue waves, breathers, mixed rogue-dark-bright and classical dark-bright solitons. While the addition of spin orbit coupling contributes to rapid oscillations in the amplitude of the rogue waves, Rabi coupling results in the appearance of stripes in the temporal direction. When the transient trap is switched on, these stripes which remain stable within the confining region, begin to overlap exponentially in the expulsive domain and eventually shrink leading to instability. We have shown that the instability arising in the rogue waves in a transient trap can be completely overcome by manipulating the scattering length through Feshbach resonance. In the case of breathers, the Rabi coupling introduces temporal stripes with single and double mode peaks around the origin while under the influence of the transient trap, the breathers get compressed and tilted. On the other hand, the amplitude of breathers which stays constant between a maxima and minima despite oscillating with time undergoes rapid fluctuations in a given spatial domain under the influence of SOC. In the case of classical dark-bright solitons, we see the flipping of dark solitons to attain positive density much similar to bright solitons under the impact of Rabi coupling. One also witnesses a <span><math><msup><mrow><mn>45</mn></mrow><mrow><mo>∘</mo></mrow></msup></math></span> shift in the trajectory of dark and bright solitons when the transient trap is switched on. The width of the solitons widen in the confining trap while they shrink in the expulsive domain.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130169"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150259","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}

{"title":"HHL algorithm without ancilla postselection for Toeplitz and Hankel systems","authors":"Yong-Le Li ,&nbsp;Bo Peng ,&nbsp;Yu-Han Wang ,&nbsp;Zhi-Chao Zhang ,&nbsp;Yu-Kun Wang","doi":"10.1016/j.physleta.2024.130154","DOIUrl":"10.1016/j.physleta.2024.130154","url":null,"abstract":"<div><div>Recently, Babukhin [D. V. Babukhin, Phys. Rev. A, 107. 042408(2023)] present the Harrow-Hassidim-Lloyd (HHL) algorithm without ancilla postselection which can work without postselection of the ancilla qubit. However, the remaining questions are to find more useful problems, which satisfy the postselection free condition. In this paper, we first prove that the symmetric Toeplitz matrices and their corresponding observable satisfy the postselection free condition. Then we show that the persymmetric Hankel matrix and the selected observable also satisfy this condition. Furthermore, we provide a specific example of a Toeplitz matrix (which is also a Hankel matrix) and a given observable. Finally, we compare the expectation values of the observable under the two different outcomes of the auxiliary qubit measurements with classical results and find excellent consistency. These results can significantly extend the application scope of postselection free HHL algorithm.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130154"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149232","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}

{"title":"A broadband zero-frequency seismic metamaterial based on negative effective mass density","authors":"Zhiheng Wang ,&nbsp;Yawen Shen ,&nbsp;Jingmei Tan ,&nbsp;Hongwu Yang ,&nbsp;Pai Peng ,&nbsp;Fengming Liu ,&nbsp;Qiujiao Du","doi":"10.1016/j.physleta.2024.130151","DOIUrl":"10.1016/j.physleta.2024.130151","url":null,"abstract":"<div><div>This study introduces the application of negative effective mass theory to design seismic metamaterials (SMs) featuring zero-frequency band gaps, targeting ultra-low frequency seismic surface waves (0–5 Hz). Investigating buried cylindrical SM unveils a zero-frequency band gap and its effective mass-spring model indicates a negative effective mass below the cutoff frequency. Based on the theoretical model, the optimized square cavity SMs achieve an impressive 267% wider zero-frequency band gap (0–4.29 Hz). For practical engineering, the equivalent attenuation effects of bedrock and fixed boundary conditions on the seismic surface waves are analyzed at ultra-low frequencies.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130151"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149240","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}

{"title":"A simple model for longitudinal electron transport during and after laser excitation: Emergence of electron resistive transport","authors":"Robert Meadows ,&nbsp;Y. Xue ,&nbsp;Nicholas Allbritton ,&nbsp;G.P. Zhang","doi":"10.1016/j.physleta.2024.130153","DOIUrl":"10.1016/j.physleta.2024.130153","url":null,"abstract":"<div><div>Laser-driven electron transport across a sample has garnered enormous attentions over several decades, as it provides a much faster way to control electron dynamics. Light is an electromagnetic wave, so how and why an electron can acquire a longitudinal velocity remains unanswered. Here we show that it is the magnetic field that steers the electron to the light propagation direction. But, quantitatively, our free-electron model is still unable to reproduce the experimental velocities. Going beyond the free electron mode and assuming the system absorbs all the photon energy, the theoretical velocity matches the experimental observation. We introduce a concept of the resistive transport, where electrons deaccelerate under a constant resistance after laser excitation. This theory finally explains why the experimental distance-versus-time forms a down-concave curve, and unifies ballistic and superdiffusive transports into a single resistive transport. We expect that our finding will motivate further investigations.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130153"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149230","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}

{"title":"Optimized contextuality for two qubits","authors":"Asma Al-Qasimi ,&nbsp;Daniel F.V. James","doi":"10.1016/j.physleta.2024.130148","DOIUrl":"10.1016/j.physleta.2024.130148","url":null,"abstract":"<div><div>Generalizing the ideas of Peres <span><span>[1]</span></span>, we investigate a measure for the <em>contextuality</em> of a two-qubit state and derive an analytic expression applicable to the most general mixed state. Further, we investigate the relationships contextuality has with quantum entanglement and quantum discord.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130148"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149233","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}

{"title":"The ideal gas of bosons and fermions in harmonic traps in the framework of extended uncertainty principle","authors":"B. Hamil ,&nbsp;B.C. Lütfüoğlu","doi":"10.1016/j.physleta.2024.130152","DOIUrl":"10.1016/j.physleta.2024.130152","url":null,"abstract":"<div><div>This manuscript studies harmonically trapped ideal Bose and Fermi gas systems and their thermodynamics in the framework of the Extended Uncertainty Principle (EUP). In particular, we demonstrated how the ground and thermal particle ratios, condensate temperature, internal energy, specific heat, and equation of state functions change in the EUP formalism. Following a comprehensive analysis, we concluded that the effect of the EUP on ideal Bose and Fermi gas systems remains relatively modest compared to the effect of the Gravitational (Generalised) Uncertainty Principle. By comparing the obtained results with experimental data, we found that the EUP parameter is bounded as <span><math><mi>α</mi><mo>≤</mo><mn>0.36654</mn><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>7</mn></mrow></msup><mspace></mspace><msup><mrow><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130152"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149234","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}

{"title":"Research on the design method of arch corrector based on Haack conformal dome","authors":"Wenwen Fan,&nbsp;Wenzhi Zhang,&nbsp;Zhigang Fan","doi":"10.1016/j.physleta.2024.130173","DOIUrl":"10.1016/j.physleta.2024.130173","url":null,"abstract":"<div><div>The Haack curve has the lowest air drag under a given condition. However, the Haack conformal dome has the most difficult non-axisymmetric dynamic aberration to correct. There is almost no research on the aberration correction method of the Haack conformal dome. The traditional fixed corrector has low design freedom and limited correction ability. Therefore, a pair of aspheric equations for non-axisymmetric systems are derived in this paper. A non-rotationally symmetric corrector with high design freedom is calculated. The simulation results show that the design method in this paper can correct the aberrations of conformal optical systems well. The problem of difficulty in solving the initial structure of the arch corrector is solved. It provides an important method for aberration correction of ogive conformal dome. The research on the aberration correction method of the Haack conformal dome solves the contradictory needs of superior aerodynamic performance and high imaging quality, which is of great significance to developing conformal optical systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130173"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149268","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}

{"title":"Self-organized deposition morphologies of polymethyl methacrylate nanoparticles in droplets during drying process","authors":"Yi Fei Liang ,&nbsp;Guang Tao Fei ,&nbsp;Shao Hui Xu ,&nbsp;Shi Jia Li ,&nbsp;Biao Wang","doi":"10.1016/j.physleta.2024.130177","DOIUrl":"10.1016/j.physleta.2024.130177","url":null,"abstract":"<div><div>The evaporation process of droplets containing nano-scale solid particles has attracted widespread attention recently. However, the laws and mechanisms underlying the formation of deposition morphologies during the evaporation process are still unclear. Herein, we prepare a mixed solution of water and ethanol containing polymethyl methacrylate nanoparticles, and research the formed morphologies of PMMA nanoparticles by self-organizing during droplet evaporation. By controlling the solvent composition and PMMA concentration of the mixture, a variety of deposition morphologies, such as stripe, brick block, arch, island and irregularity were obtained, and their formation mechanism is explained from the perspective of convection and surface tension. It is found that convection and PMMA concentration affect the regularity, continuity, crack depth and crack width of the deposition morphologies, and the corresponding deposition morphology can be obtained controllably by changing the parameters. We further prepare the stripe sample into grating and obtain regular diffraction patterns.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"531 ","pages":"Article 130177"},"PeriodicalIF":2.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150257","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}