Physica E-low-dimensional Systems & Nanostructures最新文献

{"title":"Advanced THz metasurface biosensor for label-free amino acid detection optimized with stacking ensemble algorithm","authors":"Jacob Wekalao ,&nbsp;Ahmed Mehaney ,&nbsp;Nassir Saad Alarifi ,&nbsp;Mostafa R. Abukhadra ,&nbsp;Hussein A. Elsayed ,&nbsp;Amuthakkannan Rajakannu","doi":"10.1016/j.physe.2025.116287","DOIUrl":"10.1016/j.physe.2025.116287","url":null,"abstract":"<div><div>This paper presents an advanced terahertz metasurface biosensor platform for real-time, label-free detection of amino acids. The biosensor incorporates F-shaped resonator design utilizing a hybrid material composition of graphene, gold, and silver on a silicon dioxide substrate. Computational modelling via COMSOL Multiphysics demonstrates exceptional sensitivity metrics of up to 1000 GHz/RIU and a figure of merit (FOM) of 33.333 RIU⁻¹ within the 0.1THz–0.6 THz frequency range. Systematic parametric optimization, including variations in graphene chemical potential (0.1eV–0.9 eV), incident angle (0°–80°), and resonator dimensions, ensures robust detection performance across diverse operational conditions. The biosensing capabilities are further enhanced through implementation of a stacking ensemble machine learning model, which achieves optimal prediction accuracy with an R² score of 100 % across multiple parameters. The proposed biosensor operates on physical transduction principles, detecting amino acids through resonance frequency shifts corresponding to local refractive index variations, eliminating the need for biochemical tags, enzymes, or antibody-based recognition elements. With its exceptional sensitivity, tunable design parameters, and compatibility with scalable fabrication techniques, the proposed biosensor design represents a significant advancement with potential applications spanning biomedical diagnostics, environmental monitoring, and food safety assessment. The integration of advanced machine learning frameworks further positions this technology as a promising platform for next-generation biomolecular sensing.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116287"},"PeriodicalIF":2.9,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retraction notice to “Magneto-transport signatures in periodically-driven Weyl and multi-Weyl semimetals” [Phys. E: Low-dimens. Syst. Nanostruct. 144 (2022) 115444]","authors":"Shivam Yadav ,&nbsp;Serena Fazzini ,&nbsp;Ipsita Mandal","doi":"10.1016/j.physe.2025.116283","DOIUrl":"10.1016/j.physe.2025.116283","url":null,"abstract":"","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116283"},"PeriodicalIF":2.9,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tuning the electronic and magnetic properties of germanium-substituted armchair and zigzag graphene nanoribbons: A comprehensive DFT investigation","authors":"D.M. Hoat ,&nbsp;Vo Khuong Dien ,&nbsp;Tri Pham ,&nbsp;Quoc Duy Ho ,&nbsp;Huynh Anh Huy ,&nbsp;Duy Khanh Nguyen ,&nbsp;Vo Duy Dat","doi":"10.1016/j.physe.2025.116284","DOIUrl":"10.1016/j.physe.2025.116284","url":null,"abstract":"<div><div>Substitution is among the effective methods to modify essential properties of graphene nanoribbons (GNRs) allowing them to be adaptive to a wide range of applications. In this study, the spin-polarized DFT calculations were performed to discover the structural, electronic, and magnetic properties of 7AGNR and 6ZGNR systems under different germanium substitutions. The critical concentrations and positions of Ge adatoms are considered by investigating different configurations. The systematic calculations and subsequent analysis provided a comprehensive framework for establishing the structure-property relationship. Importantly, the mechanisms responsible for this relationship were also determined, where Ge adatoms play important roles in the orbital hybridization, charge transfer, and new chemical bonding formation. The properties of 7AGNR and 6ZGNR were significantly altered by germanium substitution. The pristine 7AGNR has a bandgap of 1.57 eV, which can vary from 0.58 to 1.96 eV depending on the concentration and distribution of Ge adatom. Meanwhile, its nonmagnetic character is preserved. The 6ZGNR system, on the other hand, displays spin-splitting bandgap of 0.53 eV making it be a unique antiferromagnetic semiconductor. A single germanium atom substitution in 6ZGNR induces a ferromagnetic semi-metallic state with a magnetic moment ranging from −0.02 to −0.21 μ_B, whereas complete (100 %) germanium substitution yields a ferromagnetic semiconducting state with a magnetic moment of −0.03 μ_B. The mechanisms by which Ge adatoms modify the fundamental properties of 1D GNR systems can serve as a reference for investigating and tailoring the properties of other 1D systems for advanced applications.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116284"},"PeriodicalIF":2.9,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical absorption of biased bilayer graphene due to electron–phonon coupling and longitudinal magnetic field","authors":"Hamed Rezania ,&nbsp;Farshad Azizi","doi":"10.1016/j.physe.2025.116276","DOIUrl":"10.1016/j.physe.2025.116276","url":null,"abstract":"<div><div>Electronic and optical properties of both simple and bernal stacked bilayer graphenes taking into account the effects of interaction between electrons and Einstein phonons have been addressed. Also the magnetic field is applied perpendicular to the plane of bilayer graphene. We study the frequency dependence of absorption rate of electromagnetic wave in bilayer graphene due to magnetic field strength and electron–phonon coupling. Green’s function method has been implemented to obtain electronic properties of the system in the context of Holstein model Hamiltonian. One loop electronic self-energy of the model Hamiltonian has been obtained in order to find interacting electronic Green’s function. Optical absorption rate of electromagnetic wave in bilayer graphene due to electron–phonon coupling can be readily found using interacting Green’s function based on Kubo formula. Our results show turning on electron–phonon coupling leads to reduction of band gap in density of states of bernal stacked bilayer graphene. Also a peak appears in frequency dependence of optical absorption rate of bernal stacked bilayer graphene due to electron–phonon coupling and magnetic field. The Drude wight in absorption rate of electromagnetic wave increases with magnetic field with increase of magnetic field strength for stacking types of bilayer graphene.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116276"},"PeriodicalIF":2.9,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The connection between Hill's nanothermodynamics and Tsallis non-extensive statistical mechanics: Extracting the thermodynamic properties of a nanosystem","authors":"N. Maniotis,&nbsp;N. Frangis","doi":"10.1016/j.physe.2025.116285","DOIUrl":"10.1016/j.physe.2025.116285","url":null,"abstract":"<div><div>Based on the entropy formulation of Tsallis, in the context of non-extensive statistical thermodynamics and the fundamental works of Hill on thermodynamics of small systems (nanothermodynamics), a connection between these two branches of thermodynamics has been made through a new theoretical approach that estimates the equilibrium probability distribution of the size of, deposited on quartz, silicon nanocrystals which are an example of the completely open statistical ensemble. This ensemble describes the behavior of small systems in which the extensive variables, such as the amount of matter in the system, fluctuate under the constraint that intensive variables of temperature, pressure and chemical potential are fixed by the surroundings. The silicon nanocrystals showed a columnar structure for film thicknesses in the range of 5–30 nm. We observed that the size distribution of silicon nanocrystals, is an overlay of q-distributions. Thermodynamic properties of the nanocrystals such as the chemical potential values at different scales and the entropy were obtained after fitting with experimental data collected in different stages of film grow. Those data were taken from literature and correspond to the experimental distributions obtained for three characteristic values of nanocrystalline film thickness, namely 5, 10 and 20 nm. The good agreement between experiment and theory signifies the validity of our model.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116285"},"PeriodicalIF":2.9,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Size effects on the magnetism and magnetocaloric properties of a polymeric Ising chain","authors":"L.F. de Castro ,&nbsp;C.V. Morais ,&nbsp;F.M. Zimmer ,&nbsp;M. Schmidt","doi":"10.1016/j.physe.2025.116272","DOIUrl":"10.1016/j.physe.2025.116272","url":null,"abstract":"<div><div>We investigate the magnetism and magnetocaloric properties of a mixed-spin Ising chain composed of pentagonal pyramids with spin-1/2 particles on the pentagonal ring and a spin-1 particle on the pyramid top. By considering polymeric chains composed of a different number of pentagonal pyramids, size effects on magnetization and magnetocaloric effect were evaluated within exact enumeration. In the absence of crystal field, our results show that the increase of the chain size reduces the maximum isothermal entropy change, while the cooling capacity and the relative cooling power exhibit a weak dependence on size. On the other hand, for strengths of the crystal field near a ground-state phase transition, maximum isothermal entropy change, cooling capacity, and relative cooling power are markedly enhanced by the increase in the chain size. Therefore, our results indicate that proximity to a ground-state phase transition can lead to significant size effects on the magnetocaloric properties of polymeric mixed-spin chain magnets.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116272"},"PeriodicalIF":2.9,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electron trapping via magnetic and laser fields in gapped graphene quantum dots","authors":"Ahmed Bouhlal ,&nbsp;Mohammed El Azar ,&nbsp;Aotmane En Naciri ,&nbsp;Elmustapha Feddi ,&nbsp;Ahmed Jellal","doi":"10.1016/j.physe.2025.116273","DOIUrl":"10.1016/j.physe.2025.116273","url":null,"abstract":"<div><div>We study electron scattering in graphene quantum dots (GQDs) under the combined influence of a magnetic field, an energy gap, and circularly polarized laser irradiation. Using the Floquet approach and the Dirac equation, we derive the energy spectrum solutions. The scattering coefficients are calculated explicitly by matching the eigenspinors at the GQD interfaces, revealing a dependence on several physical parameters. In addition, we compute the scattering efficiency, the electron density distribution, and the lifetime of the quasi-bound states. Our numerical results show that the presence of an energy gap and circularly polarized laser irradiation enhances the localization of the electron density within the GQDs, leading to an increase in the lifetime of the quasi-bound states. In particular, the intensity and polarization of the light influence the scattering process, allowing the manipulation of the electron confinement state. These results highlight the importance of combining magnetic fields and polarized light to control electronic transport in graphene nanostructures.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116273"},"PeriodicalIF":2.9,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, characterization, and self-powered UV photodetection properties of GaS","authors":"Qinxi Cui,&nbsp;Lei Wang,&nbsp;Xiaohong Ji","doi":"10.1016/j.physe.2025.116281","DOIUrl":"10.1016/j.physe.2025.116281","url":null,"abstract":"<div><div>The band gap of GaS ranges from 3.05 eV to 2.6 eV as the number of layers increases from monolayer to bulk, making GaS more suitable for blue-ultraviolet photodetection applications. In this study, mono-phase GaS was obtained directly on the Ga metal surface at optimized vulcanization conditions. The single-crystalline characteristic of the fabricated GaS nanosheets was demonstrated by X-ray diffraction, Raman spectroscopy, and transmittance electron microscope analysis. Metal-semiconductor-metal structured photodetectors based on GaS nanosheets exhibited self-powered photodetection performance with a responsivity of 7.1 mA/W and a detectivity of 1 × 10⁹ Jones under 365 nm illumination. The high self-powered performance of the device is attributed to the asymmetric contact electrodes. In addition, the device showed high photodetection performance with a responsivity as high as 40.1 mA/W and a detectivity of 1 × 10¹⁰ Jones at 3 V bias under a 365 nm light illumination. The work provides a viable reference for preparing GaS and advancing photodetectors for other monochalcogenides.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116281"},"PeriodicalIF":2.9,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143898674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic properties of monolayer VS2 with or without point defects","authors":"Jingsong Lu ,&nbsp;Can Huang ,&nbsp;Bingjie Liu ,&nbsp;Yanfei Pan ,&nbsp;Jiyu Fan ,&nbsp;Chunlan Ma ,&nbsp;Yan Zhu","doi":"10.1016/j.physe.2025.116277","DOIUrl":"10.1016/j.physe.2025.116277","url":null,"abstract":"<div><div>Two-dimensional (2D) transition metal dichalcogenides (TMDs) are becoming increasingly attractive and beneficial to the development of spintronic devices and integrated circuit technologies. The magnetism of monolayer vanadium disulfide remains debated, with no consensus on whether it exhibits ferromagnetism or remains non-magnetic at room temperature. Herein, based on first-principles calculations, we study the stability and electronic structure of monolayer VS₂ in the 1T and 2H phases. Both phases are ferromagnetic ordering in the ideal structure and the magnetic exchange parameters are obtained through the spin-spiral method. Moreover, through the Monte Carlo simulator, we simulate the variation of magnetic parameters along with the increase in temperature. Finally, according to the Stoner criterion, the magnetic moment around the V point defect may collapse due to the decrease in the density of states at the Fermi level. This provides a theoretical explanation for the prevalent absence of observation of net magnetic moments in experiments.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116277"},"PeriodicalIF":2.9,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electronic properties of semimagnetic double quantum wells under effects of magnetic field and temperature","authors":"H. Azmi ,&nbsp;K. El-Bakkari ,&nbsp;A. Fakkahi ,&nbsp;M. Jaouane ,&nbsp;R. Arraoui ,&nbsp;A. Ed-Dahmouny ,&nbsp;A. Mazouz ,&nbsp;M. Jaafar ,&nbsp;A. Sali ,&nbsp;N. Amri ,&nbsp;H. El Ghazi","doi":"10.1016/j.physe.2025.116274","DOIUrl":"10.1016/j.physe.2025.116274","url":null,"abstract":"<div><div>This study examines the electronic characteristics of a diluted magnetic semiconductor double quantum well (DQW) based on the <span><math><mrow><mtext>CdTe</mtext><mo>/</mo><msub><mtext>Cd</mtext><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub><msub><mtext>Mn</mtext><mi>x</mi></msub><mtext>Te</mtext></mrow></math></span> system. Through an in-depth analysis, it assesses how various parameters including the well width (<span><math><mrow><msub><mi>L</mi><mi>w</mi></msub></mrow></math></span>), impurity position (<span><math><mrow><msub><mi>z</mi><mi>i</mi></msub></mrow></math></span>), magnetic field intensity (<span><math><mrow><mi>γ</mi></mrow></math></span>), and temperature (<span><math><mrow><mi>T</mi></mrow></math></span>) affect the binding energy (<span><math><mrow><msub><mi>E</mi><mi>b</mi></msub></mrow></math></span>) and diamagnetic susceptibility (<span><math><mrow><msub><mi>χ</mi><mtext>dia</mtext></msub></mrow></math></span>). Additionally, the investigation considers the spin polaronic shift (<span><math><mrow><msub><mi>E</mi><mtext>sp</mtext></msub></mrow></math></span>), taking into account the same influencing factors. The findings demonstrate that an increasing magnetic field leads to a reduction in <span><math><mrow><msub><mi>E</mi><mi>b</mi></msub></mrow></math></span>, particularly when the impurity is positioned at the center of the well in a semimagnetic DQW structure. Furthermore, the results indicate that a rise in temperature also diminishes <span><math><mrow><msub><mi>E</mi><mi>b</mi></msub></mrow></math></span>. Interestingly, temperature and magnetic field exhibit opposing effects on the spin polaronic shift. Moreover, the <span><math><mrow><msub><mi>χ</mi><mtext>dia</mtext></msub></mrow></math></span> is found to be dependent on the impurity location, DQW geometry, applied magnetic field, and temperature.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"172 ","pages":"Article 116274"},"PeriodicalIF":2.9,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143878559","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}