Pub Date : 2026-01-20DOI: 10.1016/j.physleta.2026.131389
Shakil Ahmad , Rashid Ahmad , Farhan Amir , Hazrat Ali , Rafi Ud Din , Abbas Ghaffar , Inzimam Ul Haq
Quantum vacuum fluctuations, one of the cornerstone of quantum physics, have many physical effects including the Casimir force, stimulating researchers in various disciplines of the scientific community. This manuscript demonstrates the manipulation of Casimir force between two closely spaced identical parallel plates under the effect of cross-Kerr nonlinearity with electromagnetically induced chirality. We use the Casimir-Lifshitz formula in connection with passivity conditions and obtain the sign of the Casimir force which, for the attractive Casimir force, is positive, whereas for the repulsive Casimir force, it is negative. We notice that by controlling the cross-Kerr field Rabi frequency, Casimir force switches from attractive to repulsive and contrariwise. Our findings reveal a pronounce enhancement in the magnitude of Casimir force via the cross-Kerr field, which may in turn be helpful to enhance the lifetimes of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS).
{"title":"The control of Casimir force enabled by cross-Kerr nonlinearity","authors":"Shakil Ahmad , Rashid Ahmad , Farhan Amir , Hazrat Ali , Rafi Ud Din , Abbas Ghaffar , Inzimam Ul Haq","doi":"10.1016/j.physleta.2026.131389","DOIUrl":"10.1016/j.physleta.2026.131389","url":null,"abstract":"<div><div>Quantum vacuum fluctuations, one of the cornerstone of quantum physics, have many physical effects including the Casimir force, stimulating researchers in various disciplines of the scientific community. This manuscript demonstrates the manipulation of Casimir force between two closely spaced identical parallel plates under the effect of cross-Kerr nonlinearity with electromagnetically induced chirality. We use the Casimir-Lifshitz formula in connection with passivity conditions and obtain the sign of the Casimir force which, for the attractive Casimir force, is positive, whereas for the repulsive Casimir force, it is negative. We notice that by controlling the cross-Kerr field Rabi frequency, Casimir force switches from attractive to repulsive and contrariwise. Our findings reveal a pronounce enhancement in the magnitude of Casimir force via the cross-Kerr field, which may in turn be helpful to enhance the lifetimes of microelectromechanical systems (MEMS) and nanoelectromechanical systems (NEMS).</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131389"},"PeriodicalIF":2.6,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081003","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}
Pub Date : 2026-01-20DOI: 10.1016/j.physleta.2026.131386
Sanjoy Mishra , Shraddha Sharma , Amit Rai , Pitamber Mahanandia
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⟩at and |2⟩at) 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.
{"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":"2026-01-20","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}
Pub Date : 2026-01-20DOI: 10.1016/j.physleta.2026.131377
Zhen Liu , Xiaohui Song , Zinan Ma , Rui He , Suicai Zhang , Leiming Yu , Yurong Jiang , Congxin Xia
Van der Waals vertical heterostructures provide an ideal platform for polarization-sensitive photodetection via tailorable interlayer transitions and anisotropic light-matter interactions. However, conventional metal top electrodes fundamentally constrain device performance by inducing optical shadowing that attenuates polarization-dependent photon flux and introducing interfacial Fermi-level pinning that mask intrinsic material anisotropy. In this study, we propose a graphene-engineered ReS2/WSe2 vertical photodiode that employs graphene as an optically transparent electrode. Utilizing ReS2’s in-plane crystalline anisotropy and type-II band alignment with WSe2, the device exhibits barrier-free electrical transport with rectification ratios exceeding 105 at ±1 V bias while achieving self-powered broadband response with on/off ratios of 106 under 405 nm illumination and 103 at 1064 nm. It simultaneously delivers a responsivity of 0.72 A W-1 combined with specific detectivity reaching 2.8 × 1010 cm Hz1/2 mW-1, accompanied by rapid response times with a 138 μs rise and a 128 μs fall. Notably, it achieves polarization-discriminative operation with a photocurrent anisotropy ratio of 1.82 under 405 nm polarized illumination. This design realizes a high-performance self-driven photodetector that integrates broadband response, polarization sensitivity, and filter-free operation within a single vertical architecture, paving a technological pathway toward compact, high-efficiency multifunctional optoelectronics.
范德华垂直异质结构通过可定制的层间跃迁和各向异性光-物质相互作用为偏振敏感光探测提供了理想的平台。然而，传统的金属顶部电极从根本上限制了器件的性能，因为它会产生光学阴影，从而衰减偏振相关的光子通量，并引入界面费米能级钉住，从而掩盖材料的本征各向异性。在这项研究中，我们提出了一种采用石墨烯作为光学透明电极的石墨烯工程ReS2/WSe2垂直光电二极管。利用ReS2的面内晶体各向异性和与WSe2的ii型波段取向，该器件在±1 V偏置下具有无障碍电输运，整流比超过105，同时在405 nm照明下实现自供电宽带响应，开关比为106，在1064 nm照明下为103。同时提供了0.72 a W-1的响应率，比探测率达到2.8 × 1010 cm Hz1/2 mW-1，并伴随着138 μs上升和128 μs下降的快速响应时间。值得注意的是，在405 nm偏振光照射下，光电流各向异性比为1.82，实现了偏振判别操作。本设计实现了一种高性能的自驱动光电探测器，它将宽带响应、极化灵敏度和无滤波器操作集成在一个单一的垂直结构中，为紧凑、高效的多功能光电子技术铺平了技术道路。
{"title":"Graphene-engineered WSe2/ReS2 vertical photodiode for self-powered polarization-sensitive broadband photodetection","authors":"Zhen Liu , Xiaohui Song , Zinan Ma , Rui He , Suicai Zhang , Leiming Yu , Yurong Jiang , Congxin Xia","doi":"10.1016/j.physleta.2026.131377","DOIUrl":"10.1016/j.physleta.2026.131377","url":null,"abstract":"<div><div>Van der Waals vertical heterostructures provide an ideal platform for polarization-sensitive photodetection via tailorable interlayer transitions and anisotropic light-matter interactions. However, conventional metal top electrodes fundamentally constrain device performance by inducing optical shadowing that attenuates polarization-dependent photon flux and introducing interfacial Fermi-level pinning that mask intrinsic material anisotropy. In this study, we propose a graphene-engineered ReS<sub>2</sub>/WSe<sub>2</sub> vertical photodiode that employs graphene as an optically transparent electrode. Utilizing ReS<sub>2</sub>’s in-plane crystalline anisotropy and type-II band alignment with WSe<sub>2</sub>, the device exhibits barrier-free electrical transport with rectification ratios exceeding 10<sup>5</sup> at ±1 V bias while achieving self-powered broadband response with on/off ratios of 10<sup>6</sup> under 405 nm illumination and 10<sup>3</sup> at 1064 nm. It simultaneously delivers a responsivity of 0.72 A W<sup>-1</sup> combined with specific detectivity reaching 2.8 × 10<sup>10</sup> cm Hz<sup>1/2</sup> mW<sup>-1</sup>, accompanied by rapid response times with a 138 μs rise and a 128 μs fall. Notably, it achieves polarization-discriminative operation with a photocurrent anisotropy ratio of 1.82 under 405 nm polarized illumination. This design realizes a high-performance self-driven photodetector that integrates broadband response, polarization sensitivity, and filter-free operation within a single vertical architecture, paving a technological pathway toward compact, high-efficiency multifunctional optoelectronics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131377"},"PeriodicalIF":2.6,"publicationDate":"2026-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081009","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}
Pub Date : 2026-01-19DOI: 10.1016/j.physleta.2026.131387
Julio C. Aguiar , Héctor O. Di Rocco
A spherically averaged, Hartree-Fock–augmented APW–like method is proposed for metals. Each valence orbital is described by a Hartree-Fock radial solution inside the Wigner-Seitz (WS) sphere and is matched in value and slope at the WS boundary to a free–electron exterior with mild exponential damping. A constant interstitial exchange–like shift sets the effective exterior wave number keff, which is estimated from LDA exchange at the density parameter rs; an optional scalar–relativistic mapping is included. The resulting orbitals are bound–like near the ion and extended outside the WS sphere, bridging atomic and metallic behavior with a minimal, transparent set of parameters. Electron momentum densities are computed and aggregated into Compton profiles for direct comparison with experiment, yielding close agreement with high–resolution measurements. While APW–like in spirit, the approach does not enforce Bloch periodicity or full self–consistency; instead, it provides a lightweight, reproducible, physically motivated parameterization.
{"title":"Spherically averaged Hartree-Fock orbitals in an APW-like framework: Comparison with Compton profile experiments","authors":"Julio C. Aguiar , Héctor O. Di Rocco","doi":"10.1016/j.physleta.2026.131387","DOIUrl":"10.1016/j.physleta.2026.131387","url":null,"abstract":"<div><div>A spherically averaged, Hartree-Fock–augmented APW–like method is proposed for metals. Each valence orbital is described by a Hartree-Fock radial solution inside the Wigner-Seitz (WS) sphere and is matched in value and slope at the WS boundary to a free–electron exterior with mild exponential damping. A constant interstitial exchange–like shift sets the effective exterior wave number <em>k</em><sub>eff</sub>, which is estimated from LDA exchange at the density parameter <em>r<sub>s</sub></em>; an optional scalar–relativistic mapping is included. The resulting orbitals are bound–like near the ion and extended outside the WS sphere, bridging atomic and metallic behavior with a minimal, transparent set of parameters. Electron momentum densities are computed and aggregated into Compton profiles for direct comparison with experiment, yielding close agreement with high–resolution measurements. While APW–like in spirit, the approach does not enforce Bloch periodicity or full self–consistency; instead, it provides a lightweight, reproducible, physically motivated parameterization.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131387"},"PeriodicalIF":2.6,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039949","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}
Pub Date : 2026-01-19DOI: 10.1016/j.physleta.2026.131390
Xiangru Kong, Erjun Zhao
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.
{"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":"2026-01-19","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}
Pub Date : 2026-01-19DOI: 10.1016/j.physleta.2026.131385
Yang Shi , Naijun Zhao , Deqiang Meng
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.
{"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":"2026-01-19","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}
Pub Date : 2026-01-18DOI: 10.1016/j.physleta.2026.131382
Ranjit Singh , Alexander E. Teretenkov
We investigate entangled Schrödinger cat-like states (SCLSs) in degenerate and non-degenerate spontaneous parametric down-conversion (SPDC) with a fully quantized, depleted pump. Our fully quantum treatment, visualized via Wigner functions, reveals non-Gaussian features and interference patterns absent in semiclassical models. For degenerate SPDC, we demonstrate significant squeezing (up to 4.04 dB) and robust super-Poissonian statistics in both non-dissipative and dissipative regimes. Extending to non-degenerate SPDC, we confirm that pump quantization also generates non-Gaussian states in all modes and yields a higher-dimensional entanglement structure, evidenced by a larger Schmidt number (K(ND) ≈ 10.38) compared to the degenerate case (K ≈ 1.93). Our approach captures critical dynamics like energy exchange and phase-dependent evolution. These entangled SCLSs, non-Gaussian states realizable in χ(2) media at moderate intensities and offering advantages over χ(3)-based schemes, are promising resources for quantum sensing and information processing.
{"title":"The formation of entangled Schrödinger cat-like states in the process of spontaneous parametric down-conversion","authors":"Ranjit Singh , Alexander E. Teretenkov","doi":"10.1016/j.physleta.2026.131382","DOIUrl":"10.1016/j.physleta.2026.131382","url":null,"abstract":"<div><div>We investigate entangled Schrödinger cat-like states (SCLSs) in degenerate and non-degenerate spontaneous parametric down-conversion (SPDC) with a fully quantized, depleted pump. Our fully quantum treatment, visualized via Wigner functions, reveals non-Gaussian features and interference patterns absent in semiclassical models. For degenerate SPDC, we demonstrate significant squeezing (up to 4.04 dB) and robust super-Poissonian statistics in both non-dissipative and dissipative regimes. Extending to non-degenerate SPDC, we confirm that pump quantization also generates non-Gaussian states in all modes and yields a higher-dimensional entanglement structure, evidenced by a larger Schmidt number (<em>K</em><sup>(ND)</sup> ≈ 10.38) compared to the degenerate case (<em>K</em> ≈ 1.93). Our approach captures critical dynamics like energy exchange and phase-dependent evolution. These entangled SCLSs, non-Gaussian states realizable in <em>χ</em><sup>(2)</sup> media at moderate intensities and offering advantages over <em>χ</em><sup>(3)</sup>-based schemes, are promising resources for quantum sensing and information processing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131382"},"PeriodicalIF":2.6,"publicationDate":"2026-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026054","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}
Pub Date : 2026-01-18DOI: 10.1016/j.physleta.2026.131384
Sunil Lavadiya , Vipul M Dabhi , Vishal Sorathiya , Gude Narendra , Abdullah G. Alharbi
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.
{"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":"2026-01-18","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}
Pub Date : 2026-01-17DOI: 10.1016/j.physleta.2026.131375
Yang Shi , Qinyan Tan , Towe Wang
In the generalized Born-Infeld electrodynamics discovered by Bandos, Lechner, Sorokin and Townsend, we study transverse electric waves propagating perpendicular to a constant magnetic field background in a parallel-plate waveguide. The directions of propagation and polarization of the waves are perpendicular to each other, and both of them are parallel to the perfectly conducting plates. Two specific configurations are studied, in which the background magnetic field is either normal to the plates or along the polarization direction. The dispersion relation, the velocity and the cutoff frequency of the lowest-order lowest-frequency mode are calculated in both configurations. This paves the way for a potential test of the generalized Born-Infeld electrodynamics.
{"title":"Transverse electric waves in Bandos-Lechner-Sorokin-Townsend nonlinear electrodynamics","authors":"Yang Shi , Qinyan Tan , Towe Wang","doi":"10.1016/j.physleta.2026.131375","DOIUrl":"10.1016/j.physleta.2026.131375","url":null,"abstract":"<div><div>In the generalized Born-Infeld electrodynamics discovered by Bandos, Lechner, Sorokin and Townsend, we study transverse electric waves propagating perpendicular to a constant magnetic field background in a parallel-plate waveguide. The directions of propagation and polarization of the waves are perpendicular to each other, and both of them are parallel to the perfectly conducting plates. Two specific configurations are studied, in which the background magnetic field is either normal to the plates or along the polarization direction. The dispersion relation, the velocity and the cutoff frequency of the lowest-order lowest-frequency mode are calculated in both configurations. This paves the way for a potential test of the generalized Born-Infeld electrodynamics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131375"},"PeriodicalIF":2.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026053","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}
Pub Date : 2026-01-17DOI: 10.1016/j.physleta.2026.131381
S. Cordero , R. López-Peña , E. Nahmad-Achar , O. Castaños , J.A. López-Saldívar , V.I. Man’ko
We use the free evolution propagator to determine the quantum probability representation (i.e., the general expression of the tomogram) of any system described by a density state. The evolution operator for the considered quantum system is additionally used to establish the corresponding time dependent tomogram. Applications are given for a Gaussian wave packet, the quantum shutter related with the phenomenon of diffraction in time, the double quantum shutter, and a finite potential. A generalisation to describe N-particle systems is also presented and, in particular, we find the tomogram associated to the two-particle case occupying in general non-orthogonal states. In the latter case, for a bipartite quantum system, the entanglement properties are established by considering quantum information concepts such as the linear entropy.
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