Pub Date : 2026-01-03DOI: 10.1016/j.physleta.2026.131333
Jingmei Tan , Pengcheng Ma , Boyang Zhang , Hongwu Yang , Fengming Liu , Pai Peng , Wenshuai Zhang , Qiujiao Du
Topological insulators (TIs) in condensed matter systems have emerged as promising platforms for guiding waves due to their robust path-defect immunity properties. This work introduces TIs into resonant seismic metamaterials (SMs) for manipulating Rayleigh waves in the low frequency domain, rather than focusing on their band gap properties for attenuating waves. We design hexagonal-lattice SMs with two-pillar unit cells on a soil substrate. Two topological SMs are achieved by breaking C3v symmetry via size and height differences, and exhibit the quantum valley Hall effect. A topological edge state (TES) is demonstrated by calculating the band structures of supercell. We construct a topological two-channel system guiding Rayleigh waves to bypass the building, and the displacement field shows that the system can remove >80% of the incident wave energy before it reaches the target building. In conclusion, our topological SM design holds potential for guiding waves and enabling energy harvesting.
{"title":"Low frequency topologically protected seismic wave transport using pillared metamaterials","authors":"Jingmei Tan , Pengcheng Ma , Boyang Zhang , Hongwu Yang , Fengming Liu , Pai Peng , Wenshuai Zhang , Qiujiao Du","doi":"10.1016/j.physleta.2026.131333","DOIUrl":"10.1016/j.physleta.2026.131333","url":null,"abstract":"<div><div>Topological insulators (TIs) in condensed matter systems have emerged as promising platforms for guiding waves due to their robust path-defect immunity properties. This work introduces TIs into resonant seismic metamaterials (SMs) for manipulating Rayleigh waves in the low frequency domain, rather than focusing on their band gap properties for attenuating waves. We design hexagonal-lattice SMs with two-pillar unit cells on a soil substrate. Two topological SMs are achieved by breaking C<sub>3v</sub> symmetry via size and height differences, and exhibit the quantum valley Hall effect. A topological edge state (TES) is demonstrated by calculating the band structures of supercell. We construct a topological two-channel system guiding Rayleigh waves to bypass the building, and the displacement field shows that the system can remove >80% of the incident wave energy before it reaches the target building. In conclusion, our topological SM design holds potential for guiding waves and enabling energy harvesting.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131333"},"PeriodicalIF":2.6,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928715","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 : 2026-01-01DOI: 10.1016/j.physleta.2025.131317
Hao Meng , Lei Cai , Xianghe Zhao , Xiuqiang Wu , Jia Xu , Guanqi Wang
We study the Josephson effect in one-dimensional SF1F2S junctions, which consist of conventional s-wave superconductors (S) connected by two ferromagnetic layers (F1 and F2). At low temperatures, the potential barrier at the F1/F2 interface can induce a quantized resonant tunneling effect. This effect not only modifies the amplitude of the critical current but also affects the phase of the Josephson current. As the exchange fields (h1, h2) and thicknesses (d1, d2) of the F1 and F2 layers vary, the critical current displays periodic resonance peaks. These peaks occur under the quantization conditions , where is the center-of-mass momentum carried by Cooper pairs, with vF being the Fermi velocity, and . It can be inferred that the potential barrier suppresses the transport of spin-singlet pairs while allowing spin-triplet pairs with zero spin projection along the magnetization axis to pass through. As these spin-triplet pairs traverse the F1 and F2 layers, the total phase they acquire determines the ground state of the Josephson junction. At the resonance peaks, the Josephson current primarily arises from the first harmonic in both the parallel and antiparallel magnetization configurations. However, in perpendicular configurations, the second harmonic becomes more significant. In scenarios where both ferromagnetic layers have identical exchange fields and thicknesses, the potential barrier selectively suppresses the current in the 0-state while allowing it to persist in the π-state for parallel configurations. Conversely, in antiparallel configurations, the current in the 0-state is consistently preserved.
{"title":"Quantized resonant tunneling effect in Josephson junctions with ferromagnetic bilayers","authors":"Hao Meng , Lei Cai , Xianghe Zhao , Xiuqiang Wu , Jia Xu , Guanqi Wang","doi":"10.1016/j.physleta.2025.131317","DOIUrl":"10.1016/j.physleta.2025.131317","url":null,"abstract":"<div><div>We study the Josephson effect in one-dimensional SF<sub>1</sub>F<sub>2</sub>S junctions, which consist of conventional s-wave superconductors (S) connected by two ferromagnetic layers (F<sub>1</sub> and F<sub>2</sub>). At low temperatures, the potential barrier at the F<sub>1</sub>/F<sub>2</sub> interface can induce a quantized resonant tunneling effect. This effect not only modifies the amplitude of the critical current but also affects the phase of the Josephson current. As the exchange fields (<em>h</em><sub>1</sub>, <em>h</em><sub>2</sub>) and thicknesses (<em>d</em><sub>1</sub>, <em>d</em><sub>2</sub>) of the F<sub>1</sub> and F<sub>2</sub> layers vary, the critical current displays periodic resonance peaks. These peaks occur under the quantization conditions <span><math><mrow><msub><mi>Q</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><msub><mi>d</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><mo>=</mo><mrow><mo>(</mo><msub><mi>n</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><mo>+</mo><mn>1</mn><mo>/</mo><mn>2</mn><mo>)</mo></mrow><mi>π</mi></mrow></math></span>, where <span><math><mrow><msub><mi>Q</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><mo>=</mo><mn>2</mn><msub><mi>h</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><mo>/</mo><mrow><mo>(</mo><mi>ℏ</mi><msub><mi>v</mi><mi>F</mi></msub><mo>)</mo></mrow></mrow></math></span> is the center-of-mass momentum carried by Cooper pairs, with <em>v<sub>F</sub></em> being the Fermi velocity, and <span><math><mrow><msub><mi>n</mi><mrow><mn>1</mn><mo>(</mo><mn>2</mn><mo>)</mo></mrow></msub><mo>=</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mo>⋯</mo></mrow></math></span>. It can be inferred that the potential barrier suppresses the transport of spin-singlet pairs while allowing spin-triplet pairs with zero spin projection along the magnetization axis to pass through. As these spin-triplet pairs traverse the F<sub>1</sub> and F<sub>2</sub> layers, the total phase they acquire determines the ground state of the Josephson junction. At the resonance peaks, the Josephson current primarily arises from the first harmonic in both the parallel and antiparallel magnetization configurations. However, in perpendicular configurations, the second harmonic becomes more significant. In scenarios where both ferromagnetic layers have identical exchange fields and thicknesses, the potential barrier selectively suppresses the current in the 0-state while allowing it to persist in the <em>π</em>-state for parallel configurations. Conversely, in antiparallel configurations, the current in the 0-state is consistently preserved.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131317"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145904018","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 : 2026-01-01DOI: 10.1016/j.physleta.2025.131315
Jia-Yi Lin, Xiao-Bao Yang, Yu-Jun Zhao
In the past several years, magnetic topological materials have attracted interests since the exotic physical phenomena unveiled on these platforms. Using first-principles calculations, we predict that two new-type magnetic van der Waals crystals, EuBi4Te7 and EuSb4Te7, are topologically nontrivial with multiple topological phases in various magnetic configurations. In their magnetic ground states, coexisting antiferromagnetic topological insulator phase and axion insulator phase are identified. Therefore, massless Dirac fermion dispersions appear on the surfaces parallel to the out-of-plane orientation. When magnetized to ferromagnetic states, axion insulator phases protected by parity symmetry survive. Meanwhile, if the spins align along the x direction, they are mirror topological crystalline insulators with massless Dirac cones on their (001) and (010) surfaces. The magnetic easy axes of EuBi4Te7 and EuSb4Te7 are along the in-plane and out-of-plane orientations, respectively. These findings open more opportunities for the research and application of magnetic topological physics and topological quantum phase transitions.
{"title":"Magnetic topological phases in the bulk van der Waals crystals EuBi4Te7 and EuSb4Te7","authors":"Jia-Yi Lin, Xiao-Bao Yang, Yu-Jun Zhao","doi":"10.1016/j.physleta.2025.131315","DOIUrl":"10.1016/j.physleta.2025.131315","url":null,"abstract":"<div><div>In the past several years, magnetic topological materials have attracted interests since the exotic physical phenomena unveiled on these platforms. Using first-principles calculations, we predict that two new-type magnetic van der Waals crystals, EuBi<sub>4</sub>Te<sub>7</sub> and EuSb<sub>4</sub>Te<sub>7</sub>, are topologically nontrivial with multiple topological phases in various magnetic configurations. In their magnetic ground states, coexisting antiferromagnetic topological insulator phase and axion insulator phase are identified. Therefore, massless Dirac fermion dispersions appear on the surfaces parallel to the out-of-plane orientation. When magnetized to ferromagnetic states, axion insulator phases protected by parity symmetry survive. Meanwhile, if the spins align along the <em>x</em> direction, they are mirror topological crystalline insulators with massless Dirac cones on their (001) and (010) surfaces. The magnetic easy axes of EuBi<sub>4</sub>Te<sub>7</sub> and EuSb<sub>4</sub>Te<sub>7</sub> are along the in-plane and out-of-plane orientations, respectively. These findings open more opportunities for the research and application of magnetic topological physics and topological quantum phase transitions.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131315"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145904012","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 : 2026-01-01DOI: 10.1016/j.physleta.2025.131323
Omar Kahouli , Md. Moniruzzaman , Ali Aloui , Md. Imtiaz Uddin , Zied Elleuch , Maher Jebali , Samir Salem Al-Bawri
This paper presents a metamaterial-based absorber that performs near-unity absorption across the visible spectrum. For this design, tungsten has been selected as both the resonator and the backplane, while fused quartz serves as the substrate. The resonator structure contains a square ring within which identical triangle-shaped resonators are arranged in a fan-shaped pattern at the center of the unit cell. The proposed absorber maintains an average absorption of 93.37% across the visible range (380–700 nm), with two absorption peaks at 428 nm (98.2%) and 620 nm (97.5%). It exhibits polarization and incident angle insensitivity up to 90° for transverse electric (TE) and transverse magnetic (TM) waves. Cross-polarization effect on absorption has been studied, considering its effect on absorption, and a similar result is attained for different polarized signals. The proposed MMA, notable for its broadband absorption and polarization insensitivity, can be effectively employed in photovoltaic devices for solar energy accumulation.
{"title":"Design and property analysis of wideband metamaterial absorber with high visible spectrum absorption","authors":"Omar Kahouli , Md. Moniruzzaman , Ali Aloui , Md. Imtiaz Uddin , Zied Elleuch , Maher Jebali , Samir Salem Al-Bawri","doi":"10.1016/j.physleta.2025.131323","DOIUrl":"10.1016/j.physleta.2025.131323","url":null,"abstract":"<div><div>This paper presents a metamaterial-based absorber that performs near-unity absorption across the visible spectrum. For this design, tungsten has been selected as both the resonator and the backplane, while fused quartz serves as the substrate. The resonator structure contains a square ring within which identical triangle-shaped resonators are arranged in a fan-shaped pattern at the center of the unit cell. The proposed absorber maintains an average absorption of 93.37% across the visible range (380–700 nm), with two absorption peaks at 428 nm (98.2%) and 620 nm (97.5%). It exhibits polarization and incident angle insensitivity up to 90° for transverse electric (TE) and transverse magnetic (TM) waves. Cross-polarization effect on absorption has been studied, considering its effect on absorption, and a similar result is attained for different polarized signals. The proposed MMA, notable for its broadband absorption and polarization insensitivity, can be effectively employed in photovoltaic devices for solar energy accumulation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"571 ","pages":"Article 131323"},"PeriodicalIF":2.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927897","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 : 2025-12-31DOI: 10.1016/j.physleta.2025.131322
Ziyang Zhu , Dan Jin , Rui Xiong
Using first-principles calculations, this study investigates the stability and electronic properties of VSe2 and WSe2 monolayers, as well as VSe2/WSe2 heterostructures. VSe2 and WSe2 monolayers are characterized as ferromagnetic and non-magnetic semiconductor, respectively. The dynamic and thermodynamic stability of VSe2/WSe2 heterostructure is confirmed through phonon spectra and molecular dynamics simulations. Energy comparisons across different magnetic states - including nonmagnetic, ferromagnetic, and antiferromagnetic - reveal that the heterostructure possesses a ferromagnetic ground state. Furthermore, based on the band structure and work function of the VSe2/WSe2 heterostructure, we found that the VSe2/WSe2 heterostructure exhibits type-II band alignment. Under the biaxial tensile strains (1-5%), the system transforms into half-metallic state, achieving 100% spin polarization at the Fermi level. Additionally, we find that the effect of twist angle on the electronic property of VSe2/WSe2 heterostructure can be ignored. Our research is of great significance for the development of the fields of optoelectronics and spintronics.
{"title":"Regulation of strain and twist on electronic properties of VSe2/WSe2 van der Waals heterostructure","authors":"Ziyang Zhu , Dan Jin , Rui Xiong","doi":"10.1016/j.physleta.2025.131322","DOIUrl":"10.1016/j.physleta.2025.131322","url":null,"abstract":"<div><div>Using first-principles calculations, this study investigates the stability and electronic properties of VSe<sub>2</sub> and WSe<sub>2</sub> monolayers, as well as VSe<sub>2</sub>/WSe<sub>2</sub> heterostructures. VSe<sub>2</sub> and WSe<sub>2</sub> monolayers are characterized as ferromagnetic and non-magnetic semiconductor, respectively. The dynamic and thermodynamic stability of VSe<sub>2</sub>/WSe<sub>2</sub> heterostructure is confirmed through phonon spectra and molecular dynamics simulations. Energy comparisons across different magnetic states - including nonmagnetic, ferromagnetic, and antiferromagnetic - reveal that the heterostructure possesses a ferromagnetic ground state. Furthermore, based on the band structure and work function of the VSe<sub>2</sub>/WSe<sub>2</sub> heterostructure, we found that the VSe<sub>2</sub>/WSe<sub>2</sub> heterostructure exhibits type-II band alignment. Under the biaxial tensile strains (1-5%), the system transforms into half-metallic state, achieving 100% spin polarization at the Fermi level. Additionally, we find that the effect of twist angle on the electronic property of VSe<sub>2</sub>/WSe<sub>2</sub> heterostructure can be ignored. Our research is of great significance for the development of the fields of optoelectronics and spintronics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131322"},"PeriodicalIF":2.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928714","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 : 2025-12-31DOI: 10.1016/j.physleta.2025.131320
Shuaihui Tian , Hengbo Zhang
The nodes and edges are critical components in a complex network. As the "bridges" connecting nodes, edge weights play a significant auxiliary role in identifying important nodes. When information about a complex network is incomplete, particularly when edge weights are missing, exploring the role of potential edge weights in identifying critical nodes becomes essential. This study proposes a novel method for identifying important nodes based on potential edge weights. This method integrates the dynamic and static edge weights in the network, as well as the reachability of nodes. Firstly, random walks and high - order network features are used to capture the dynamic and static information of edges, so as to construct the potential edge weights in the network. Subsequently, the edge weights are utilized to calculate the reachability of nodes. Finally, the importance of nodes is calculated and ranked. Experimental simulations conducted on eight different types of real - world networks demonstrate that the proposed method outperforms existing methods in identifying and ranking important nodes.
{"title":"A method for identifying important nodes in complex networks based on potential edge weights","authors":"Shuaihui Tian , Hengbo Zhang","doi":"10.1016/j.physleta.2025.131320","DOIUrl":"10.1016/j.physleta.2025.131320","url":null,"abstract":"<div><div>The nodes and edges are critical components in a complex network. As the \"bridges\" connecting nodes, edge weights play a significant auxiliary role in identifying important nodes. When information about a complex network is incomplete, particularly when edge weights are missing, exploring the role of potential edge weights in identifying critical nodes becomes essential. This study proposes a novel method for identifying important nodes based on potential edge weights. This method integrates the dynamic and static edge weights in the network, as well as the reachability of nodes. Firstly, random walks and high - order network features are used to capture the dynamic and static information of edges, so as to construct the potential edge weights in the network. Subsequently, the edge weights are utilized to calculate the reachability of nodes. Finally, the importance of nodes is calculated and ranked. Experimental simulations conducted on eight different types of real - world networks demonstrate that the proposed method outperforms existing methods in identifying and ranking important nodes.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"571 ","pages":"Article 131320"},"PeriodicalIF":2.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927900","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 : 2025-12-31DOI: 10.1016/j.physleta.2025.131300
Tingting Zhang , Jiawei Lu , Caiying Wu , Yuping Duan , Jun Liu , Tieyong Zeng , Qiyu Jin , Guoqing Chen , Jean-Michel Morel , Boying Wu , Gabriele Facciolo
Blind image deblurring remains challenging in computational imaging due to the unknown blur kernel, often relying on complex priors or heuristic edge selection. This study presents a novel gradient sparsity framework guided by curvature for robust blind image deblurring. By extracting curvature information from image gradients, we design an efficient L1 regularization term to enhance edge retention and image sharpness while minimizing computational overhead. A spatially adaptive edge-weighting function is introduced to dynamically adjust regularization intensity according to local image characteristics, ensuring robust performance across various regions. The optimization problem is decomposed into two convex sub-problems, which are efficiently solved in closed form via the half-quadratic splitting algorithm. Comprehensive experiments on benchmark datasets demonstrate that our approach outperforms cutting-edge methods in both peak signal-to-noise ratio and structural similarity, producing sharper images with reduced artifacts. This framework provides a computationally efficient and robust solution for blind deblurring, especially in resource-constrained environments.
{"title":"Edge-adaptive curvature-based regularization for robust blind image restoration","authors":"Tingting Zhang , Jiawei Lu , Caiying Wu , Yuping Duan , Jun Liu , Tieyong Zeng , Qiyu Jin , Guoqing Chen , Jean-Michel Morel , Boying Wu , Gabriele Facciolo","doi":"10.1016/j.physleta.2025.131300","DOIUrl":"10.1016/j.physleta.2025.131300","url":null,"abstract":"<div><div>Blind image deblurring remains challenging in computational imaging due to the unknown blur kernel, often relying on complex priors or heuristic edge selection. This study presents a novel gradient sparsity framework guided by curvature for robust blind image deblurring. By extracting curvature information from image gradients, we design an efficient <em>L</em><sub>1</sub> regularization term to enhance edge retention and image sharpness while minimizing computational overhead. A spatially adaptive edge-weighting function is introduced to dynamically adjust regularization intensity according to local image characteristics, ensuring robust performance across various regions. The optimization problem is decomposed into two convex sub-problems, which are efficiently solved in closed form via the half-quadratic splitting algorithm. Comprehensive experiments on benchmark datasets demonstrate that our approach outperforms cutting-edge methods in both peak signal-to-noise ratio and structural similarity, producing sharper images with reduced artifacts. This framework provides a computationally efficient and robust solution for blind deblurring, especially in resource-constrained environments.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131300"},"PeriodicalIF":2.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145928757","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 : 2025-12-31DOI: 10.1016/j.physleta.2025.131321
A. Naifar , K. Hasanirokh
In this study, we investigate the combined effects of pressure, temperature, and geometric dimensions on the electronic and optical properties of a GaAs quantum ring, incorporating both Rashba and Dresselhaus spin–orbit couplings (SOC). The influence of these factors on energy spectra, dipole transition matrix elements, optical absorption coefficients, and refractive index changes is analyzed within a theoretical framework. Our results demonstrate that variations in external conditions and SOC strengths significantly modify the electronic behavior and optical response of the structure. These findings highlight important pathways for tuning the performance of GaAs-based nanostructures, offering potential applications in future optoelectronic and spintronic devices.
{"title":"Modulating absorption coefficient and refractive index changes in GaAs quantum rings under the simultaneous influence of temperature, pressure, and Rashba-Dresselhaus spin-orbit couplings","authors":"A. Naifar , K. Hasanirokh","doi":"10.1016/j.physleta.2025.131321","DOIUrl":"10.1016/j.physleta.2025.131321","url":null,"abstract":"<div><div>In this study, we investigate the combined effects of pressure, temperature, and geometric dimensions on the electronic and optical properties of a GaAs quantum ring, incorporating both Rashba and Dresselhaus spin–orbit couplings (SOC). The influence of these factors on energy spectra, dipole transition matrix elements, optical absorption coefficients, and refractive index changes is analyzed within a theoretical framework. Our results demonstrate that variations in external conditions and SOC strengths significantly modify the electronic behavior and optical response of the structure. These findings highlight important pathways for tuning the performance of GaAs-based nanostructures, offering potential applications in future optoelectronic and spintronic devices.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"572 ","pages":"Article 131321"},"PeriodicalIF":2.6,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038527","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 : 2025-12-30DOI: 10.1016/j.physleta.2025.131299
Gombojav O. Ariunbold , Tuguldur Begzjav
Quantum state engineering operating with photons is a key enabler of major scientific breakthroughs and future quantum technologies. Its primary obstacle, however, is decoherence often caused by spontaneous emission, which is inherently difficult to control. In contrast, superradiance offers a more controllable alternative. The temporal dynamics of superradiance can be tuned via external experimental parameters, unlike those of spontaneous emission. Incorporating superradiance into quantum state engineering could therefore provide more accessible control over quantum systems. Motivated by this, we present a theoretical model for an ensemble of atoms in a V-type three-level configuration. The system successively emits a pair of superradiance pulses, effectively synthesizing the dynamically decoupled sub-ensembles into a single macroscopic ensemble involving all atoms. To our knowledge, this process, which we term superradiant synthesis, is demonstrated here for the first time. These findings offer new insights for practical quantum state engineering, particularly in enabling syntheses of macroscopic quantum sub-systems.
{"title":"Superradiant syntheses via the V-type three-level atoms","authors":"Gombojav O. Ariunbold , Tuguldur Begzjav","doi":"10.1016/j.physleta.2025.131299","DOIUrl":"10.1016/j.physleta.2025.131299","url":null,"abstract":"<div><div>Quantum state engineering operating with photons is a key enabler of major scientific breakthroughs and future quantum technologies. Its primary obstacle, however, is decoherence often caused by spontaneous emission, which is inherently difficult to control. In contrast, superradiance offers a more controllable alternative. The temporal dynamics of superradiance can be tuned via external experimental parameters, unlike those of spontaneous emission. Incorporating superradiance into quantum state engineering could therefore provide more accessible control over quantum systems. Motivated by this, we present a theoretical model for an ensemble of atoms in a V-type three-level configuration. The system successively emits a pair of superradiance pulses, effectively synthesizing the dynamically decoupled sub-ensembles into a single macroscopic ensemble involving all atoms. To our knowledge, this process, which we term superradiant synthesis, is demonstrated here for the first time. These findings offer new insights for practical quantum state engineering, particularly in enabling syntheses of macroscopic quantum sub-systems.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"571 ","pages":"Article 131299"},"PeriodicalIF":2.6,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145927895","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 : 2025-12-30DOI: 10.1016/j.physleta.2025.131310
Peter Schmelcher
We perform a computational spectral analysis of isospectrally patterned lattices (IPL) that consist of coupled degenerate cells, being uniquely parametrized by a set of phases. We focus on two-dimensional cells and explore symmetric as well as asymmetric IPL. A tunable fraction of localized vs. delocalized eigenstates belonging to the three subdomains of the corresponding energy bands is demonstrated and analyzed with different measures of localization. For the asymmetric case the center of localization can be shifted arbitrarily by shifting the underlying phase grid. Introducing a complete phase revolution leads for low and high energies to two well-separated branches of localized states which finally merge with increasing energy into the branch of delocalized states. Remarkably, the localized states appear in near-degenerate pairs and this near-degeneracy is lifted upon entering the delocalization regime. A corresponding generalization to several phase revolutions is provided showing a characteristic nodal pattern among the near-degenerate eigenstates.
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