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

{"title":"Friedel oscillations in a two-dimensional electron gas and monolayer graphene with a non-Coulomb impurity potential","authors":"Levente Máthé ,&nbsp;Ioan Grosu","doi":"10.1016/j.physe.2025.116328","DOIUrl":"10.1016/j.physe.2025.116328","url":null,"abstract":"<div><div>We study Friedel oscillations in a two-dimensional non-interacting electron gas and in a monolayer graphene in the presence of a single impurity. The potential generated by the impurity is modeled using a non-Coulomb interaction (<span><math><mrow><mo>∼</mo><msup><mrow><mi>r</mi></mrow><mrow><mo>−</mo><mi>η</mi></mrow></msup></mrow></math></span>). The charge carrier density deviation as a function of distance from the impurity is calculated within the linear response theory. Our results show that, in both a two-dimensional non-interacting electron gas and graphene, the phase of charge carrier density oscillations remains unaffected by the parameter <span><math><mi>η</mi></math></span>, which characterizes the non-Coulomb nature of the interaction, at large distances from the impurity. The parameter <span><math><mi>η</mi></math></span> influences only the amplitude of the oscillations in this regime. The results for an impurity modeled by Coulomb-like potential (<span><math><mrow><mi>η</mi><mo>=</mo><mn>1</mn></mrow></math></span>) are recovered in both cases.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116328"},"PeriodicalIF":2.9,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144687398","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":"Theoretical analysis of thermal conductivities of amorphous films based on thermal resistance network model","authors":"Qingxuan Wang ,&nbsp;Puqing Jiang ,&nbsp;Jun Zhou","doi":"10.1016/j.physe.2025.116329","DOIUrl":"10.1016/j.physe.2025.116329","url":null,"abstract":"<div><div>Amorphous nanoscale thin films have attracted significant attention in advanced device research. We developed a thermal resistance network model to calculate the thermal conductivity of amorphous thin films and applied it to several materials, achieving results in agreement with the experimental data. Our theoretical model approaches the thermal transport in anisotropic disordered systems from a cluster-based perspective. While offering higher accuracy than other models, it also provides a simple physical picture to describe the anisotropic thermal conductivity behavior of amorphous thin films. The results are helpful for experimentally tuning the thermal conductivity of amorphous thin films and advancing the understanding of their thermal properties.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116329"},"PeriodicalIF":2.9,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655688","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":"Multiphoton intersubband transitions in an armchair graphene ribbon subject to dc electric field","authors":"B.S. Monozon","doi":"10.1016/j.physe.2025.116325","DOIUrl":"10.1016/j.physe.2025.116325","url":null,"abstract":"<div><div>We study analytically the influence of the time-independent electric field on the multi-photon absorption and Rabi oscillations (Franz–Keldysh (F–K) effect) in an armchair graphene nanoribbon (AGNR), caused by the time-oscillating electric field of an intense light wave. Constant (dc) electric field is taken to be much weaker than the ac light wave field. Both fields are polarized parallel to the ribbon axis. Following the Wallace model, the Dirac equation for the massless electron subject to the ribbon confinement and electric fields is employed. In the resonant approximation, the electron–hole pair production rate for the electron transitions between the valence and conduction size-quantized subbands, corresponding multiphoton absorption coefficient, as well as the characteristics of the Rabi oscillations are derived in an explicit form. We explicitly trace the dependencies of the absorption coefficient and Rabi oscillations parameters on the electric fields magnitudes and ribbon width. An interplay between the two mechanisms of the intersubband transitions is found to occur. It is shown that the Rabi frequency and intensities of the absorption peaks are determined mostly by the strong electric field of the light wave (multiphoton assisted mechanism), whereas the weak dc electric field drastically modifies the frequency spectra of the Rabi oscillations and multiphoton absorption (tunneling mechanism). Estimates of the expected experimental values for the typical AGNR, electric field strengths and driving frequencies show the experimental feasibility of the F–K effect. Our results demonstrate that the AGNRs are a suitable 1D condensed matter media, in which the quantum electrodynamic vacuum decay can be detected using the current laboratory technologies.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116325"},"PeriodicalIF":2.9,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144655689","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":"Enhanced thermoelectric performance driven by the rattling effect and unique electronic structure in layered nitrides SrMN2 (M = Zr, Hf)","authors":"Yunfei Wang ,&nbsp;Yinchang Zhao ,&nbsp;Xichang Wang ,&nbsp;Jun Ni ,&nbsp;Zhenhong Dai","doi":"10.1016/j.physe.2025.116320","DOIUrl":"10.1016/j.physe.2025.116320","url":null,"abstract":"<div><div>Layered nitrides have emerged as a new class of thermoelectric materials that have attracted considerable attention in recent years due to their unique geometric configurations and electronic structures. Based on first-principles calculations, this study combines the Boltzmann transport equation and self-consistent phonon (SCP) theory to systematically and comprehensively investigate the thermoelectric transport properties of the layered nitride SrMN<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> (M = Zr, Hf). The results reveal that the significant rattling behavior of Sr atoms enhances the anharmonicity of the material, effectively reducing the lattice thermal conductivity. A comparative analysis between HA and SCP results confirms the necessity of incorporating higher-order anharmonicity and four-phonon (4ph) scattering mechanisms in strongly anharmonic systems. In addition, we comprehensively considered four major scattering mechanisms, namely MFP, ADP, IMP, and POP, to obtain more accurate electrical transport characteristics. The pronounced band dispersion and high degeneracy in the valence band endow the p-type SrMN<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> with an excellent Seebeck coefficient and power factor at high temperatures. At 900K, the maximum ZT values of p-type SrZrN<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> and p-type SrHfN<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> reach 1.22 and 1.11, respectively, demonstrating outstanding thermoelectric performance. This study highlights that the strong anharmonicity arising from weakly bonded heavy elements, together with the unique two-dimensional electrical structure of SrMN<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>, plays a crucial role in enhancing thermoelectric performance, making it a highly promising candidate for high-performance thermoelectric applications.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116320"},"PeriodicalIF":2.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144714568","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":"Anisotropic thermal conductivity properties of black phosphorene","authors":"Leonid Vilyaev ,&nbsp;Dmitry Zav'yalov ,&nbsp;Vladimir Konchenkov","doi":"10.1016/j.physe.2025.116330","DOIUrl":"10.1016/j.physe.2025.116330","url":null,"abstract":"<div><div>This paper investigates the total anisotropic electronic thermal conductivity of phosphorene, focusing on both phonon and electronic contributions. Utilizing the Boltzmann kinetic equation within the quasi-classical approximation, we derive analytical expressions for the electronic thermal conductivity in both armchair (<span><math><mrow><mi>A</mi><mi>C</mi></mrow></math></span>) and zigzag (<span><math><mrow><mi>Z</mi><mi>Z</mi></mrow></math></span>) directions. Our findings reveal that the electronic thermal conductivity exhibits significant directional dependence, with values in the <span><math><mrow><mi>Z</mi><mi>Z</mi></mrow></math></span>-direction being an order of magnitude greater than those in the <span><math><mrow><mi>A</mi><mi>C</mi></mrow></math></span>-direction at room temperature (300 K). The anisotropy is attributed to the differences in effective electron masses along these directions. We also explore the non-monotonic behavior of the dependence of the thermal conductivity on the angle between the temperature gradient and heat flux vectors, offering insights into the electronic contributions to thermal transport. The results suggest that experimental measurements of this angular dependence can be used to quantitatively isolate electronic effects in phosphorene, furthering its potential applications in electronics and optoelectronics.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116330"},"PeriodicalIF":2.9,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597535","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":"From 2D to 1D in β-naphthyne: A porous carbon allotrope merging graphyne and naphthylene","authors":"José A.S. Laranjeira ,&nbsp;K.A.L. Lima ,&nbsp;Nicolas F. Martins ,&nbsp;Marcelo L.P. Junior ,&nbsp;L.A. Ribeiro Junior ,&nbsp;Julio R. Sambrano","doi":"10.1016/j.physe.2025.116316","DOIUrl":"10.1016/j.physe.2025.116316","url":null,"abstract":"<div><div>Two-dimensional (2D) carbon-based materials have attracted considerable interest due to their diverse structural and electronic properties, making them ideal for next-generation flat electronics. Among these materials, metallic-like porous structures offer advantages such as tunable charge transport and high surface area, which are essential for energy storage applications. In this study, we introduce <span><math><mi>β</mi></math></span>-naphthyne, a novel 2D carbon allotrope composed of naphthyl units interconnected by octagonal rings. First-principles calculations confirm its dynamic and thermal stability, demonstrating its theoretical feasibility. Furthermore, we demonstrate that Young’s modulus ranges from 43.71 N/m to 165.88 N/m, indicating an anisotropic mechanical response. Optical analysis reveals absorption activity in the infrared (IR) and ultraviolet (UV) regions. The derived 1D structures were also analyzed, revealing a Dirac cone and a transition from metallic to semiconducting behavior. These findings establish <span><math><mi>β</mi></math></span>-naphthyne as a promising material for energy storage and optoelectronic technologies.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116316"},"PeriodicalIF":2.9,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144597536","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":"A tunable terahertz metamaterial perfect absorber based on graphene for cancer cell detection","authors":"Zishan Yang ,&nbsp;Anqi Li ,&nbsp;Zhitao Wang ,&nbsp;Feng Huang ,&nbsp;Zhaoyang Chen","doi":"10.1016/j.physe.2025.116323","DOIUrl":"10.1016/j.physe.2025.116323","url":null,"abstract":"<div><div>This paper presents the design of a terahertz metamaterial absorber. This design incorporates a three-layer structure: the bottom layer (metal), the middle layer (medium material), and the top layer (patterned graphene), including graphene square frame and a double Z-shaped structure. The simplicity of this design streamlines the manufacturing process. Simulations were conducted using CST Microwave Studio. The results show that the absorber exhibits two absorption peaks with absorptivity of 90.86% and 100% at 3.85 THz and 5.04 THz, respectively. It is found that applying an external bias voltage can modulate the electrical conductivity of graphene, enabling dynamic regulation of the absorptivity and resonant frequency without altering the structural parameters. Additionally, the absorber’s structure is rotationally symmetric, making it polarization-insensitive. And the maximum incident angle for maintaining spectral stability can reach up to 80°. The very important feature of the proposed absorber is its high sensitivity of 1.64 THz/RIU, making it well-suited for practical applications in refractive index sensing. Meanwhile, the simulation for the detection of MCF-7 cancer cells was conducted. And the sensitivity of it is 1.714 THz/RIU. This level of sensitivity ensures effective detection of the target analytes.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116323"},"PeriodicalIF":2.9,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579401","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":"Phase-transition-enabled dual-band camouflage in VO2/Ag multilayered nanostructures","authors":"Zhou Ai ,&nbsp;Hua Yang ,&nbsp;Mengsi Liu ,&nbsp;Shubo Cheng ,&nbsp;Junqiao Wang ,&nbsp;Chaojun Tang ,&nbsp;Fan Gao ,&nbsp;Boxun Li","doi":"10.1016/j.physe.2025.116327","DOIUrl":"10.1016/j.physe.2025.116327","url":null,"abstract":"<div><div>In order to address the challenges of multispectral detection in day and night environments, a multilayer nanostructure integrating VO₂ and Ag for real-line dual-band visible-infrared camouflage is proposed. The structure utilises the temperature-dependent phase change characteristics of VO₂ in a Fabry-Pérot cavity to dynamically modify its structural coloring from cold to warm tones (e.g., from blue at 580 nm to yellow at 436 nm), thereby achieving background-adaptive visible light region stealth. Concurrently, the ultrathin silver layer functions to suppress the infrared emissivity (defined as ε &lt; 0.1 in the 4–14 μm band), thereby ensuring minimal radiation contrast with the surrounding environment under both low and high temperature conditions. The simulation results demonstrate that the structure is polarization-insensitive and wide-angle tolerant (the infrared emissivity does not exceed 0.1 during the 0°–50° change), while the energy dissipation analysis indicates that the VO₂ layer exhibits a significant absorption effect on visible light and is driven by silver to suppress the infrared band. The colour-changing design offers a compact, adjustable, and practical solution for multispectral stealth in military applications.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116327"},"PeriodicalIF":2.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563236","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":"Structure, energetics, and dynamics of penta-graphene nanoscrolls","authors":"Mizraim B. Teixeira ,&nbsp;David Azevedo ,&nbsp;Leonardo D. Machado","doi":"10.1016/j.physe.2025.116321","DOIUrl":"10.1016/j.physe.2025.116321","url":null,"abstract":"<div><div>Nanoscrolls can be derived from two-dimensional materials by rolling them into a papyrus-like structure. Their open-ended geometry gives them unique properties, such as variable interlayer distances. Nanoscrolls based on various types of monolayers have been proposed in the last decades, and in this work, we employ reactive Molecular Dynamics simulations to investigate penta-graphene nanoscrolls (PGNSs). We also study graphene nanoscrolls (GNSs) for comparison. Our energy analysis reveals that both scroll types are stable. We observed substantial differences when comparing the dynamics of GNSs and PGNSs, with the number of turns increasing to raise van der Waals interactions in the former. In contrast, this number always remained constant in the latter. Our results show that this difference arises from the different frictional characteristics of the parent monolayers, as the presence of buckling in penta-graphene leads to high friction, preventing edge movement in PGNSs. Our study highlights the importance of the frictional characteristics of monolayers to the dynamics of nanoscrolls.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116321"},"PeriodicalIF":2.9,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557453","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":"Theoretical study of the density of states and thermal properties of Cd1-xMnxTe quantum wire under the combined effects of the applied magnetic field, spin orbit coupling and exchange effects","authors":"Diana Dahliah,&nbsp;Asad Shendi,&nbsp;Mohammad Elsaid","doi":"10.1016/j.physe.2025.116326","DOIUrl":"10.1016/j.physe.2025.116326","url":null,"abstract":"<div><div>This study investigates the electronic, thermal, and magnetocaloric properties of the diluted magnetic semiconductor Cd_1-xMn_xTe in quantum wire (QW) geometry. We solve the Hamiltonian for an electron confined in a cylindrical quantum wire under an external magnetic field, incorporating the Rashba spin–orbit interaction (SOI) and exchange interactions. The resulting energy dispersion relations are used to calculate the electronic structure, Landau levels and the density of states (DOS). Our analysis shows that the DOS is strongly influenced by the combined effects of spin splitting, Rashba SOI, exchange interaction, and magnetic field strength. By tuning these parameters, the DOS <em>pattern can be optimized</em> for specific spintronic applications. The magnetocaloric effect (MCE) is explored, revealing a pronounced MCE behavior in the low-temperature regime (T &lt; 70 K). The results demonstrate that the magnetic and thermodynamic properties of Cd_1-xMn_xTe quantum wires can be precisely modulated by adjusting the SOI strength, exchange interaction, temperature, and wire confinement. This tunability <em>highlights</em> the potential of this material for low-temperature spintronic applications, magnetic refrigeration technologies.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"173 ","pages":"Article 116326"},"PeriodicalIF":2.9,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144579400","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}