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.
{"title":"From free-evolution to symplectic quantum tomographic representation","authors":"S. Cordero , R. López-Peña , E. Nahmad-Achar , O. Castaños , J.A. López-Saldívar , V.I. Man’ko","doi":"10.1016/j.physleta.2026.131381","DOIUrl":"10.1016/j.physleta.2026.131381","url":null,"abstract":"<div><div>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 <em>N</em>-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.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131381"},"PeriodicalIF":2.6,"publicationDate":"2026-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026056","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 : 2026-01-16DOI: 10.1016/j.physleta.2026.131363
F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed
We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord D(ρ), reflected entropy ER(ρ), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with –6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement ER(ρ) decouples dynamically from overall quantumness D(ρ), suggesting new routes to correlation-selective, fault-tolerant quantum control.
{"title":"A hierarchy of quantum control and the dissociation of entanglement from quantum discord","authors":"F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed","doi":"10.1016/j.physleta.2026.131363","DOIUrl":"10.1016/j.physleta.2026.131363","url":null,"abstract":"<div><div>We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord <em>D</em>(<em>ρ</em>), reflected entropy <em>E<sub>R</sub></em>(<em>ρ</em>), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with <span><math><mrow><mi>N</mi><mo>=</mo><mn>2</mn></mrow></math></span>–6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement <em>E<sub>R</sub></em>(<em>ρ</em>) decouples dynamically from overall quantumness <em>D</em>(<em>ρ</em>), suggesting new routes to correlation-selective, fault-tolerant quantum control.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131363"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026055","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 : 2026-01-16DOI: 10.1016/j.physleta.2026.131383
Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong
The effect of impurity ions on turbulence, mean and zonal flow dynamics has been studied in HL-2A ohmically-heated deuterium plasmas by a combined Langmuir probe array. Results show that the fluctuating level of geodesic acoustic mode (GAM) zonal flows has an obvious reduction, while the GAM frequency remains nearly unchanged after the impurity injection. Further analysis demonstrates that with impurity injection the GAM zonal flows gain less energy from the high frequency fluctuations in 300-500 kHz due to the reduction of eddies titling angle and shape stretched by E × B mean flow through the so-called vortex thinning process, concurrently the turbulent transport concentrated in 15-100 kHz increases, indicating that electrostatic fluctuations driving zonal flows and fluctuations responsible for the particle transport originate from different instabilities. These experimental results reveal the critical role of mean flow in mediating the inverse cascade from small scale turbulence to large scale zonal flows as well as its coupling with turbulent transport. This study could advance our understanding of fundamental physics on the multi-scale interaction and its implication for controlling turbulent transport through impurity ions in future fusion plasmas.
{"title":"Effect of impurity ions on interplay between turbulence, mean and zonal flows in toroidal magnetized plasmas","authors":"Q. Zou , J. Cheng , Z.B. Shi , Y. Xu , L.W. Yan , X. Chen , J. Chen , L. Liu , Z.H. Huang , N. Wu , W.C. Wang , R.X. Huang , Z.S. Shi , C.F. Dong , X.Q. Ji , W.L. Zhong","doi":"10.1016/j.physleta.2026.131383","DOIUrl":"10.1016/j.physleta.2026.131383","url":null,"abstract":"<div><div>The effect of impurity ions on turbulence, mean and zonal flow dynamics has been studied in HL-2A ohmically-heated deuterium plasmas by a combined Langmuir probe array. Results show that the fluctuating level of geodesic acoustic mode (GAM) zonal flows has an obvious reduction, while the GAM frequency remains nearly unchanged after the impurity injection. Further analysis demonstrates that with impurity injection the GAM zonal flows gain less energy from the high frequency fluctuations in 300-500 kHz due to the reduction of eddies titling angle and shape stretched by E × B mean flow through the so-called vortex thinning process, concurrently the turbulent transport concentrated in 15-100 kHz increases, indicating that electrostatic fluctuations driving zonal flows and fluctuations responsible for the particle transport originate from different instabilities. These experimental results reveal the critical role of <span><math><mrow><mi>E</mi><mo>×</mo><mi>B</mi></mrow></math></span> mean flow in mediating the inverse cascade from small scale turbulence to large scale zonal flows as well as its coupling with turbulent transport. This study could advance our understanding of fundamental physics on the multi-scale interaction and its implication for controlling turbulent transport through impurity ions in future fusion plasmas.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131383"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146079990","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 : 2026-01-16DOI: 10.1016/j.physleta.2026.131355
Zhaoyan Xu
The concept of soliton gas has become well-known in recent years and the soliton gas has been studied by using various methods. The letter will approach this topic from a perspective of mathematical physics by constructing a Thermodynamic Bethe Ansatz model, treating N-soliton solutions of the Sawada-Kotera equation as N quasi-particles. As the number N of the solitons approaches infinity, the N-soliton system will evolve into a soliton gas of the Sawada-Kotera equation. By deriving the corresponding physical concepts, the kinetic equation associated with this soliton gas is derived immediately. This work will inspire the study of soliton gas of other physically important integrable systems.
{"title":"The generalized hydrodynamic framework for the Sawada-Kotera equation and its kinetic equations","authors":"Zhaoyan Xu","doi":"10.1016/j.physleta.2026.131355","DOIUrl":"10.1016/j.physleta.2026.131355","url":null,"abstract":"<div><div>The concept of soliton gas has become well-known in recent years and the soliton gas has been studied by using various methods. The letter will approach this topic from a perspective of mathematical physics by constructing a Thermodynamic Bethe Ansatz model, treating <em>N</em>-soliton solutions of the Sawada-Kotera equation as <em>N</em> quasi-particles. As the number <em>N</em> of the solitons approaches infinity, the <em>N</em>-soliton system will evolve into a soliton gas of the Sawada-Kotera equation. By deriving the corresponding physical concepts, the kinetic equation associated with this soliton gas is derived immediately. This work will inspire the study of soliton gas of other physically important integrable systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131355"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081010","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 : 2026-01-16DOI: 10.1016/j.physleta.2026.131347
Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo
A deep understanding of coherent transport through a double quantum dot (DQD) is essential to the design of a quantum device. In this work, we investigate the nonequilibrium transport of particles and energy through a DQD by employing the full counting statistics framework, which is established based on a generalized quantum master equation (GQME) without the secular approximation. We demonstrate the unique advantage of our approach in the regime of small interdot couplings, where quantum coherence gives rise to a strong charge localization in the DQD, leading intriguingly to a prominent super-Poissonian noise. We reveal that the frequency-dependent noise of the energy current is a sensitive indicator of quantum coherence, which offers the possibility to identify the bath-induced or the tunnel coupling-induced decoherences. These findings highlight the importance of utilizing a GQME without the secular approximation for an appropriate description of energy and charge transport through DQD devices.
{"title":"Full counting statistics of charge and energy transport through a double quantum dot system beyond secular approximation","authors":"Biao Fan , Mengjie Tong , Yuguo Su , Gabriel Ouma Paul , Francis Okoth Awiti , Elijah Omollo Ayieta , Szabolcs Kelemen , Feng Zhai , Junyan Luo","doi":"10.1016/j.physleta.2026.131347","DOIUrl":"10.1016/j.physleta.2026.131347","url":null,"abstract":"<div><div>A deep understanding of coherent transport through a double quantum dot (DQD) is essential to the design of a quantum device. In this work, we investigate the nonequilibrium transport of particles and energy through a DQD by employing the full counting statistics framework, which is established based on a generalized quantum master equation (GQME) without the secular approximation. We demonstrate the unique advantage of our approach in the regime of small interdot couplings, where quantum coherence gives rise to a strong charge localization in the DQD, leading intriguingly to a prominent super-Poissonian noise. We reveal that the frequency-dependent noise of the energy current is a sensitive indicator of quantum coherence, which offers the possibility to identify the bath-induced or the tunnel coupling-induced decoherences. These findings highlight the importance of utilizing a GQME without the secular approximation for an appropriate description of energy and charge transport through DQD devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"573 ","pages":"Article 131347"},"PeriodicalIF":2.6,"publicationDate":"2026-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146039614","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}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号