Physics Letters A最新文献

{"title":"Solving constrained BKP hierarchy by boson–fermion correspondence","authors":"Yanwei Zhang ,&nbsp;Mengyao Chen ,&nbsp;Jipeng Cheng","doi":"10.1016/j.physleta.2025.130620","DOIUrl":"10.1016/j.physleta.2025.130620","url":null,"abstract":"<div><div>Solutions of <span><math><mo>(</mo><mi>k</mi><mo>,</mo><mi>m</mi><mo>)</mo></math></span>–constrained BKP hierarchy <span><math><msup><mrow><mi>L</mi></mrow><mrow><mi>k</mi></mrow></msup><mo>=</mo><msub><mrow><mo>(</mo><msup><mrow><mi>L</mi></mrow><mrow><mi>k</mi></mrow></msup><mo>)</mo></mrow><mrow><mo>≥</mo><mn>0</mn></mrow></msub><mo>+</mo><msubsup><mrow><mo>∑</mo></mrow><mrow><mi>i</mi><mo>=</mo><mn>1</mn></mrow><mrow><mi>m</mi></mrow></msubsup><mo>(</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>1</mn><mo>,</mo><mi>i</mi></mrow></msub><msup><mrow><mo>∂</mo></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><msub><mrow><mo>(</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>2</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>)</mo></mrow><mrow><mi>x</mi></mrow></msub><mo>−</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>2</mn><mo>,</mo><mi>i</mi></mrow></msub><msup><mrow><mo>∂</mo></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><msub><mrow><mo>(</mo><msub><mrow><mi>q</mi></mrow><mrow><mn>1</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>)</mo></mrow><mrow><mi>x</mi></mrow></msub><mo>)</mo></math></span> with <span><math><mi>k</mi><mo>∈</mo><msubsup><mrow><mi>Z</mi></mrow><mrow><mo>≥</mo><mn>0</mn></mrow><mrow><mi>odd</mi></mrow></msubsup></math></span> are investigated by boson–fermion correspondence. Firstly, <span><math><mo>(</mo><mi>k</mi><mo>,</mo><mi>m</mi><mo>)</mo></math></span>–constrained BKP hierarchy is converted into the fermionic form <span><math><msub><mrow><mi>Ω</mi></mrow><mrow><mi>k</mi></mrow></msub><mo>(</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>⊗</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo><mo>=</mo><mfrac><mrow><mn>1</mn></mrow><mrow><mn>2</mn></mrow></mfrac><msubsup><mrow><mo>∑</mo></mrow><mrow><mi>i</mi><mo>=</mo><mn>1</mn></mrow><mrow><mi>m</mi></mrow></msubsup><mo>(</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>2</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>⊗</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>1</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>−</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>1</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>⊗</mo><msub><mrow><mi>τ</mi></mrow><mrow><mn>2</mn><mo>,</mo><mi>i</mi></mrow></msub><mo>)</mo></math></span>. Then we determine the conditions for the fermionic field <em>β</em>, which keeps the fermionic form of constrained BKP hierarchy after the transformations <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>α</mi></mrow></msub><mo>→</mo><mi>β</mi><msub><mrow><mi>τ</mi></mrow><mrow><mi>α</mi></mrow></msub></math></span> for <span><math><mi>α</mi><mo>=</mo><mn>0</mn></math></span>, <span><math><mo>{</mo><mn>1</mn><mo>,</mo><mi>i</mi><mo>}</mo></math></span> and <span><math><mo>{</mo><mn>2</mn><mo>,</mo><mi>i</mi><mo>}</mo></math></span>. Finally based upon this, the corresponding solutions are given by boson–fermion correspondence.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130620"},"PeriodicalIF":2.3,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929626","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":"Electronic, optical and magnetic properties of Ti-doped and (Ti, VSi) co-doped 4H-SiC: A first-principles study","authors":"Yuan Huang,&nbsp;Xi Zhang,&nbsp;Ya Nie,&nbsp;Juncheng Luo,&nbsp;Hongyu Zhu,&nbsp;Dinghua Yang,&nbsp;Gang Xiang","doi":"10.1016/j.physleta.2025.130612","DOIUrl":"10.1016/j.physleta.2025.130612","url":null,"abstract":"<div><div>The electronic, optical and magnetic properties of both Ti-doped 4H-SiC and (Ti, V_Si) co-doped 4H-SiC are investigated using first-principles calculations based on the density functional theory (DFT). The energy calculations revealed that Ti atoms preferentially occupy Si lattice sites, characterized by the lowest formation energy and optimal structural stability. Ti doping reduces the bandgap of 4H-SiC from 2.22 eV to 2.13 eV, significantly enhancing its optical response to low energy photon fields. Upon (Ti, V_Si) co-doping, the bandgap of 4H-SiC decreases further to 0.89 eV and exhibits an indirect-to-direct transition, thereby improving optical absorption in the low energy spectral range. Detailed Analysis of magnetic properties reveals that the local magnetic moment in the co-doped system is primarily derived from electron spin splitting and redistribution in C atoms surrounding V_Si, elucidating the synergistic regulation mechanism of magnetism through defects and dopants. The findings give insights into Ti-doped and (Ti, V_Si) co-doped 4H-SiC and may be useful for their applications in optoelectronic and spintronic devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130612"},"PeriodicalIF":2.3,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917791","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":"Analysis of 3D inhomogeneous optical systems via the Lorentzian formalism","authors":"Angel García-Botella ,&nbsp;Manuel Gutiérrez","doi":"10.1016/j.physleta.2025.130606","DOIUrl":"10.1016/j.physleta.2025.130606","url":null,"abstract":"<div><div>The application of Lorentz geometry to the study of homogeneous media nonimaging optical systems was introduced successfully in <span><span>[1]</span></span>, see also <span><span>[2]</span></span>, based on the analogy between lightlike cones and the cone of edge rays. Recently, we applied this technique to the study of 2D inhomogeneous optical systems <span><span>[3]</span></span>. In the present paper, we generalize previous studies to stationary 3D inhomogeneous optical systems. We obtain and provide some solutions to the systems of nonlinear partial differential equations in cartesian and spheric coordinates in three dimensions. We study optical systems with exponential refraction index. The solutions provide the geometrical vector flux <strong>J</strong> at any point of these 3D optical systems. From this Lorentzian formalism, we have obtained irradiance patterns of these stationary inhomogeneous optical systems and we have compared it with irradiance patterns obtained by raytrace simulations. Finally a study of the physical interpretation of eigenvalues of the Gram matrix of the Lorentzian metric <strong>G</strong> is presented.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130606"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922426","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":"Study of a transient triangular atom mirror behavior","authors":"Sana Khattak,&nbsp;Qurrat-ul-Ain Gulfam","doi":"10.1016/j.physleta.2025.130605","DOIUrl":"10.1016/j.physleta.2025.130605","url":null,"abstract":"<div><div>The reflective properties of a three-atom system arranged in an equilateral triangle configuration are investigated, with a focus on collective dynamics driven by vacuum-induced dipole-dipole interactions. In the study, one or more atoms are initially prepared in an excited state, with collective damping and spontaneous emission considered. The aim is to observe periodic time-dependent exchange of populations among the atoms, which is interpreted as mirror-like behavior. Results reveal that an atomic mirror behavior emerges in two-dimensional systems, with a strong dependence on inter atomic distances. For separations smaller than about one fourth of the atomic wavelength, the system manifests periodic population exchange, resembling a stable triangular atomic mirror. The dynamics are significantly shaped by the initial state preparation, with initially symmetric superpositions generating synchronized oscillations and selective suppression of dipole-dipole interactions between specific atom pairs, leading to more stable and prolonged mirror-like behavior, even for relatively larger inter-atomic separations. These findings provide insights into the collective behavior of atoms in two-dimensional configurations, offering potential applications in the realms of quantum optics and quantum information processing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130605"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929622","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":"Wave propagation in thin-walled mono-symmetric metabeam with periodically placed piezoelectric sensor and actuator","authors":"Arindam Das ,&nbsp;Kamal K. Bera ,&nbsp;Arnab Banerjee","doi":"10.1016/j.physleta.2025.130607","DOIUrl":"10.1016/j.physleta.2025.130607","url":null,"abstract":"<div><div>This paper introduces a novel method to generate an attenuation band in a thin-walled mono-symmetric metabeam by periodically attaching piezoelectric patches serving as sensors and actuators. The periodic configuration enables the creation of a subwavelength attenuation band. Using Hamilton's principle, equations of motion for a unit cell with piezoelectric patches are derived. The dispersion characteristics are analyzed through the transfer matrix and Bloch-Floquet theorem, while modal frequencies are validated against finite-element results. Dispersion plots and the transmittance spectrum confirm the formation of band gaps where beam responses are suppressed. A parametric study explores the influence of the geometric properties of the system on attenuation bands. The results demonstrate the potential for achieving a low-frequency band gap, highlighting its applicability in vibration attenuation and acoustic control.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130607"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922427","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":"Three forms of dimension reduction for border-collision bifurcations","authors":"D.J.W. Simpson","doi":"10.1016/j.physleta.2025.130603","DOIUrl":"10.1016/j.physleta.2025.130603","url":null,"abstract":"<div><div>For dynamical systems that switch between different modes of operation, parameter variation can cause periodic solutions to lose or acquire new switching events. When this causes the eigenvalues (stability multipliers) associated with the solution to change discontinuously, we show that if one eigenvalue remains continuous then all local invariant sets of the leading-order approximation to the system occur on a lower dimensional manifold. This allows us to analyse the dynamics with fewer variables, which is particularly helpful when the dynamics is chaotic. We compare this to two other codimension-two scenarios for which dimension reduction can be achieved.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130603"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936742","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":"Can an uncertainty relation generate a plasma?","authors":"A. Gholamhosseinian ,&nbsp;R.W. Corkery ,&nbsp;I. Brevik ,&nbsp;M. Boström","doi":"10.1016/j.physleta.2025.130611","DOIUrl":"10.1016/j.physleta.2025.130611","url":null,"abstract":"<div><div>We explore the fundamental idea that there may be a role for the Casimir effect, via an uncertainty relation, in the generation of electron-positron and quark-gluon plasmas. We investigate this concept, reviewing the possible contribution of semi-classical electrodynamics to nuclear interactions, specifically focusing on the Casimir effect at sub-Fermi length scales. The main result is a temperature distance relation, derived from the time-energy uncertainty relation, which can have observable consequences at these extreme scales. From a more general perspective, since the energy-time uncertainty relation appears to be a significant physical quantity, we also provide a brief overview of recent developments in this direction in Sec. <span><span>3.2</span></span>.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"550 ","pages":"Article 130611"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936743","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":"Complex tridiagonal quantum Hamiltonians and matrix continued fractions","authors":"Miloslav Znojil","doi":"10.1016/j.physleta.2025.130604","DOIUrl":"10.1016/j.physleta.2025.130604","url":null,"abstract":"<div><div>Quantum resonances described by non-Hermitian tridiagonal-matrix Hamiltonians <em>H</em> with complex energy eigenvalues are considered. The possibility is analyzed of the evaluation of quantities <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> known as the singular values of <em>H</em>. What is constructed are self-adjoint block-tridiagonal operators <span><math><mi>H</mi></math></span> (with eigenvalues <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>) and their resolvents (defined in terms of a matrix continued fraction, MCF). In an illustrative application of the formalism to the discrete version of conventional <span><math><mi>H</mi><mo>=</mo><mo>−</mo><msup><mrow><mi>d</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>/</mo><mi>d</mi><msup><mrow><mi>x</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mi>V</mi><mo>(</mo><mi>x</mi><mo>)</mo></math></span> with complex local <span><math><mi>V</mi><mo>(</mo><mi>x</mi><mo>)</mo><mo>≠</mo><msup><mrow><mi>V</mi></mrow><mrow><mo>⁎</mo></mrow></msup><mo>(</mo><mi>x</mi><mo>)</mo></math></span>, the numerical MCF convergence is found quick and, moreover, supported also by a fixed-point-based formal proof.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130604"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922424","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":"Average coherence with respect to generalized Wigner-Yanase-Dyson skew information and (N,M)-POVMs","authors":"Ruo-xiao Chen,&nbsp;Yi Long,&nbsp;Yu-shuang Song,&nbsp;Liang Tang,&nbsp;Fan Wu","doi":"10.1016/j.physleta.2025.130610","DOIUrl":"10.1016/j.physleta.2025.130610","url":null,"abstract":"<div><div>Quantum coherence is a significant physical resource stemming from the principle of superposition of quantum states, and plays a pivotal role in elucidating the unique and intriguing properties of the quantum realm. At the same time, quantum measurement, serving as a critical tool for quantifying coherence, is intrinsically linked to the choice of measurement basis. Building on this foundation, we delve into the average coherence of arbitrary quantum states by leveraging generalized Wigner-Yanase-Dyson skew information and a broad class of informationally complete symmetric measurements, the latter can be viewed as a generalization encompassing of symmetric, informationally complete POVMs and mutually unbiased measurements. Furthermore, we define the maximal coherence of generalized Wigner-Yanase-Dyson skew information, and a series of trade-off relations between different maximal coherence and average coherence are derived. In order to verify the reliability of the obtained results, we have carried out detailed analysis with concrete examples.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130610"},"PeriodicalIF":2.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143929623","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":"Chirality dependent sorting of 360° domain wall in a branch structure","authors":"Vemuru Haragopal ,&nbsp;Rohan Jaiswal ,&nbsp;Vijayanandhini Kannan ,&nbsp;Chandrasekhar Murapaka","doi":"10.1016/j.physleta.2025.130629","DOIUrl":"10.1016/j.physleta.2025.130629","url":null,"abstract":"<div><div>We have demonstrated 360° domain wall (DW) sorting in a branch structure based on its chirality. The 360° DW driven by the current-induced spin-transfer torque shows a linear motion with preserved spin texture up to a certain critical current density. Interestingly, the critical current density is shifted towards the higher values when the DW is driven in a branch structure. Above the critical current density, the 360° DW transforms into a novel vortex DW with spin texture different from the conventional vortex DWs. The core of the vortex DW moves transverse to the DW motion and drives the DW motion into one of the branches. Thus, the DWs with opposite chirality moves into different branches facilitating the chirality dependent sorting operation within the branch structure. The velocity of 360° DW changes linearly with increase in the current density values however it is independent of the angle between the two branches.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"551 ","pages":"Article 130629"},"PeriodicalIF":2.3,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143931357","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}