Physica E-low-dimensional Systems & Nanostructures最新文献_第8页

Effect of the position of a hydrogen-like impurity on the generation of the third harmonic in a cylindrical quantum dot 类氢杂质的位置对圆柱形量子点三次谐波产生的影响

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-08 DOI: 10.1016/j.physe.2025.116223

A.A. Portacio , D. Madrid , D.A. Rasero

{"title":"Effect of the position of a hydrogen-like impurity on the generation of the third harmonic in a cylindrical quantum dot","authors":"A.A. Portacio , D. Madrid , D.A. Rasero","doi":"10.1016/j.physe.2025.116223","DOIUrl":"10.1016/j.physe.2025.116223","url":null,"abstract":"<div><div>This paper presents a theoretical study of the third-order nonlinear optical susceptibility in a GaAs/Ga<sub>0.6</sub>Al<sub>0.4</sub>As cylindrical quantum dot (CDQ) with a hydrogen-like impurity inside. The variational method was utilized to calculate the energies and wave functions corresponding to the bound states of the impurity, which include the <span><math><mrow><mn>1</mn><mi>s</mi></mrow></math></span>-like, <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mo>−</mo></mrow></msub></mrow></math></span>-like, <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mo>+</mo></mrow></msub></mrow></math></span>-like, and <span><math><mrow><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mi>z</mi></mrow></msub></mrow></math></span>-like states, with consideration of the impurity’s motion within the cylindrical quantum dot. The findings indicate that the resonant peaks of the optical third harmonic generation (THG) coefficient undergo a red shift as the impurity is displaced from the center of the CDQ towards the potential barrier. This shift can be attributed to a reduction in the average electrostatic interaction between the impurity and the surrounding ion as the impurity approaches the potential barrier. This phenomenon can be attributed to the decreased electrostatic attraction between the impurity and the quantum dot core as the impurity moves away from the center and approaches the region of higher potential confinement. These findings have significant implications for the design and optimization of quantum dot-based optoelectronic devices, as manipulation of the impurity position can provide additional control over the nonlinear optical properties of these systems.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116223"},"PeriodicalIF":2.9,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593302","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}

引用次数: 0

Porous graphitic carbon nitride with sodium doped and N vacancies for synergistically enhancing the performance of RhB photodegradation 多孔石墨氮化碳与钠掺杂和N空位协同提高RhB光降解性能

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-06 DOI: 10.1016/j.physe.2025.116233

Nuo Xu , Dawei Liu , Juan Xu , Changshun Wang , Tingcha Wei , Caixia Kan

{"title":"Porous graphitic carbon nitride with sodium doped and N vacancies for synergistically enhancing the performance of RhB photodegradation","authors":"Nuo Xu , Dawei Liu , Juan Xu , Changshun Wang , Tingcha Wei , Caixia Kan","doi":"10.1016/j.physe.2025.116233","DOIUrl":"10.1016/j.physe.2025.116233","url":null,"abstract":"<div><div>Graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) stands out as a highly promising visible-light-driven photocatalyst, yet it grapples with the challenge of boosting its photocatalytic performance by increasing specific surface area, inhibiting charge recombination, and stimulating light absorption. Herein, we successfully synthesized a porous g-C<sub>3</sub>N<sub>4</sub> combining sodium doped and N vacancies to synergistically enhance the photocatalytic performance through a simple secondary thermal polymerization method. The experimental results indicate that the existing porous structure elevates the specific surface area of g-C<sub>3</sub>N<sub>4</sub> to 17.52 m<sup>2</sup> g<sup>−1</sup>. Concurrently, benefiting from the narrower band gap and the more efficient charge separation derived from the synergistic modulation of sodium doped and N vacancies, Na-P-g-C<sub>3</sub>N<sub>4</sub> exhibits 5-fold enhanced catalytic efficiency of Rhodamine B photodegradation compared with the undoped g-C<sub>3</sub>N<sub>4</sub>. This work deepens our insights into optimizing g-C<sub>3</sub>N<sub>4</sub> for highly effective photocatalytic materials through synergistic modulation of sodium doped and N vacancies.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116233"},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577348","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}

引用次数: 0

4d and 5d transition-metal doped Janus PtSSe as a viable sensitive sensor toward COCl2 掺杂 4d 和 5d 过渡金属的 Janus PtSSe 可作为 COCl2 的灵敏传感器

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-06 DOI: 10.1016/j.physe.2025.116234

Jiawei Shen , Qingxiao Zhou , Xinglong Yan , Weiran Li , Weiwei Ju , Chengyou Cai

{"title":"4d and 5d transition-metal doped Janus PtSSe as a viable sensitive sensor toward COCl2","authors":"Jiawei Shen , Qingxiao Zhou , Xinglong Yan , Weiran Li , Weiwei Ju , Chengyou Cai","doi":"10.1016/j.physe.2025.116234","DOIUrl":"10.1016/j.physe.2025.116234","url":null,"abstract":"<div><div>The adsorption behaviors, electronic and gas-sensing properties of phosgene (COCl<sub>2</sub>) on perfect, defected (S- and Se-vacancy), and transition-metal doped (TMs: Pd, Hf, Ta, W, Re, Os, Ir, and Au) PtSSe monolayer were explored by density functional theory (DFT). Pristine PtSSe monolayer exhibited long adsorption distance, small adsorption energy and low charge transfer for phosgene with physical adsorption. Constructing S- and Se-vacancy enhanced the PtSSe's sensitivity to phosgene, while it remained as physical adsorption nature. Furthermore, the adsorption stability of PtSSe toward COCl<sub>2</sub> was further improved after the introduction of Pd, Hf, Ta, W, Re, Ir dopants. The large adsorption energies and high charge transfer suggested that the adsorption mechanism of COCl<sub>2</sub> was converted to chemical adsorption. Moreover, the large gas response and suitable recovery time indicated the Re-doped Janus PtSSe monolayer could be reusable gas sensors for COCl<sub>2</sub> detection with high sensitivity at room temperature. These results offer insights into the design of gas sensors capable of detecting the highly toxic COCl<sub>2</sub> gas.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116234"},"PeriodicalIF":2.9,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143577349","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}

引用次数: 0

Optical absorption and refractive index change of neutral donors in InAs/GaAs camel-like nanostructures: 3D finite element analysis 中性给体在InAs/GaAs骆驼状纳米结构中的光吸收和折射率变化：三维有限元分析

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-04 DOI: 10.1016/j.physe.2025.116222

R.A. López-Doria , N. Hernández , M.R. Fulla

{"title":"Optical absorption and refractive index change of neutral donors in InAs/GaAs camel-like nanostructures: 3D finite element analysis","authors":"R.A. López-Doria , N. Hernández , M.R. Fulla","doi":"10.1016/j.physe.2025.116222","DOIUrl":"10.1016/j.physe.2025.116222","url":null,"abstract":"<div><div>Spectral and optical properties of neutral donors confined in experimentally grown InAs/GaAs camel-like nanostructures were investigated using the spatial finite element method within the effective mass approximation. The total absorption and refractive index changes were determined by using the compact matrix density formalism. The energy spectrum was found to strongly depend on the donor’s position, with transition energies between the first three low-lying levels below 20 meV (THz band) and further tuneable by applying a static electric field along the “humps”. On-center donor, on-hump donor, and nearly single-electron systems were found to be optically active even at zero electric field. Their optical properties can also be enhanced at specific electric field strengths, a phenomenon linked to the formation of significant dipole moment values and confirmed through volumetric probability density analyses. Additionally, all the systems exhibited a periodic absorption profile with the polarization angle, resembling a “nanoscopic polarizer”.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116222"},"PeriodicalIF":2.9,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Middle polariton and Schrödinger's cat induced by exciton-photon-phonon coupling system 激子-光子-声子耦合系统诱导的中极化子和Schrödinger的cat

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-03-01 DOI: 10.1016/j.physe.2025.116226

Xuebing Gong, Hai Zhu

引用次数: 0

Flexible modulation of topological resonator based on different domain walls based on graphene plasmonic valley photonic crystals 基于石墨烯等离子体谷光子晶体的不同畴壁拓扑谐振腔柔性调制

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-27 DOI: 10.1016/j.physe.2025.116225

Lei Xu , Shiqi Qiu , Bangyu Li , Shengqun Guo , Ruimin Huang , Weibin Qiu

{"title":"Flexible modulation of topological resonator based on different domain walls based on graphene plasmonic valley photonic crystals","authors":"Lei Xu , Shiqi Qiu , Bangyu Li , Shengqun Guo , Ruimin Huang , Weibin Qiu","doi":"10.1016/j.physe.2025.116225","DOIUrl":"10.1016/j.physe.2025.116225","url":null,"abstract":"<div><div>Topological edge states (ES) emerge at the interfaces between photonic crystals with distinct topological properties, enabling the suppression of backscattering for unidirectional transmission and exhibiting robustness against defects and disorders. In this work, we propose a flexible modulation strategy for the ES within resonators based on graphene plasmonic valley photonic crystals (VPhCs). Specifically, we initially construct four types of rhombic resonators composed by domain walls using topological valley edge states (VES), achieving localized ES optical fields at various domain walls. Subsequently, four categories of domain walls are heterogeneously integrated to form a single hexagonal resonator. The electromagnetic field distribution in the resonators is dynamically modulated by the variation of the frequency. Our results might provide opportunities for the flexible modulation of ES in graphene plasmonic VPhC resonators, offering prospects for applications in topological plasmonic lasers and high-density micro-nano photonic integration.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116225"},"PeriodicalIF":2.9,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552877","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}

引用次数: 0

First-principles exploration of hydrogen evolution ability in MoS2/hBNC/MoSSe vdW trilayer heterojunction for water splitting MoS2/hBNC/MoSSe vdW三层异质结水分裂析氢能力的第一线原理探索

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-24 DOI: 10.1016/j.physe.2025.116221

Lei Tian , Jiahuan Hu , Chengyu He , Zhenyi Jiang

引用次数: 0

Regulation of electronic structures in ReSeS monolayer with anisotropic deformations 具有各向异性变形的ReSeS单层中电子结构的调控

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-22 DOI: 10.1016/j.physe.2025.116210

Timsy Tinche Lin , Haochen Deng , Junwei Ma , Lizhe Liu

{"title":"Regulation of electronic structures in ReSeS monolayer with anisotropic deformations","authors":"Timsy Tinche Lin , Haochen Deng , Junwei Ma , Lizhe Liu","doi":"10.1016/j.physe.2025.116210","DOIUrl":"10.1016/j.physe.2025.116210","url":null,"abstract":"<div><div>Because of their unique and rich physical properties, transition metal dichalcogenides (TMDs) materials have attracted much interest. Many studies suggest that introducing the degree of freedom of anisotropy—which may be brought about by low structural symmetry—might further optimize their applications in industry and manufacturing. However, most currently reported TMDs do not achieve the theoretical minimum symmetry. Utilizing the first principles calculation, we present ReSeS monolayer with a Janus structure. Results indicate that its electronic dispersion is sensitive to structural distortions, which increases metallicity. Our reduction-Hamiltonian can provide a qualitative description, but further analyses reveal that bonding/antibonding properties near the Fermi surface are the more fundamental cause of the variations. Furthermore, geometric deformations can regulate the effective mass of electrons as well as the spectroscopic response, resulting in anisotropic behaviours. Our ideas serve as a foundation for developing new regulable optoelectronic devices.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116210"},"PeriodicalIF":2.9,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474371","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}

引用次数: 0

Friedel oscillations in two-dimensional materials with inverted bands and Mexican-hat dispersion 具有倒带和墨西卡色散的二维材料中的弗里德尔振荡

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-22 DOI: 10.1016/j.physe.2025.116213

Vladimir A. Sablikov

引用次数: 0

High-sensitivity graphene-gold metasurface optical biosensor for early melanoma detection optimized with machine learning using a one-dimensional convolutional neural network and binary encoding 用于黑色素瘤早期检测的高灵敏度石墨烯-金超表面光学生物传感器，使用一维卷积神经网络和二进制编码进行机器学习优化

IF 2.9 3区物理与天体物理

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2025-02-21 DOI: 10.1016/j.physe.2025.116214

Jacob Wekalao , Ahmed Mehaney , Nassir Saad Alarifi , Mostafa R. Abukhadra , Hussein A. Elsayed

{"title":"High-sensitivity graphene-gold metasurface optical biosensor for early melanoma detection optimized with machine learning using a one-dimensional convolutional neural network and binary encoding","authors":"Jacob Wekalao , Ahmed Mehaney , Nassir Saad Alarifi , Mostafa R. Abukhadra , Hussein A. Elsayed","doi":"10.1016/j.physe.2025.116214","DOIUrl":"10.1016/j.physe.2025.116214","url":null,"abstract":"<div><div>This research presents an advanced terahertz metasurface sensor incorporating graphene and gold elements in a W-shaped resonator configuration for non-invasive melanoma detection. The sensor design, optimized through COMSOL Multiphysics simulations, operates by detecting minute variations in the refractive index of skin tissue that occur during early melanoma development. The optimized sensor achieves a sensitivity of 450 GHzRIU<sup>−1</sup> with a narrow spectral linewidth of 35 GHz in the terahertz regime. A one-dimensional convolutional neural network (1D-CNN) algorithm enhances the sensor's predictive capabilities, achieving R<sup>2</sup> values exceeding 0.95 across various operational parameters. The sensor demonstrates dual functionality through binary information encoding capability via chemical potential modulation. The proposed design shows significant advantages over conventional diagnostic methods, offering rapid, non-invasive detection with high accuracy. Moreover, our numerical findings reveals that the designed sensor provides some robustness performance against various geometric parameters and incident angles, which in turns make it promising for practical melanoma diagnosis applications.</div></div>","PeriodicalId":20181,"journal":{"name":"Physica E-low-dimensional Systems & Nanostructures","volume":"170 ","pages":"Article 116214"},"PeriodicalIF":2.9,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465352","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}

引用次数: 0